INSTRUCTION MANUAL Sound Level Meter NL-42 / NL-52 3-20-41 Higashimotomachi, Kokubunji, Tokyo 185-8533, Japan http://www.rion.co.
Organization of the NL-42/NL-52 documentation Documentation for the Sound Level Meter NL-42/NL-52 comes in three parts, as listed below. Instruction Manual (this document) Describes operating procedures for the Sound Level Meter NL-42/NL-52, connection and use of peripheral equipment such as a level recorder and printer, and use of the memory card. Serial Interface Manual Describes communication with a computer, using the serial interface built into the Sound Level Meter NL-42/NL-52.
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Organization of this manual This manual describes the features, operation and other aspects of the Sound Level Meter NL-42/NL-52. If the unit is used together with other equipment to configure a measurement system, consult the documentation of all other components as well. Pages v and following contain important information about safety. Be sure to read and observe these in full. This manual contains the following sections. Outline Gives basic information about the unit.
Input/Output Connectors Explains the input and output connectors of the unit. Default Settings Lists the factory default settings of the unit. Setup Files Explains how to start up the unit using settings saved in a setup file. Optional Accessories Explains how to use the optional microphone extension cable, printer, and level recorder with the unit. Specifications Lists the technical specifications of the unit.
FOR SAFETY In this manual, important safety instructions are specially marked as shown below. To prevent the risk of death or injury to persons and severe damage to the unit or peripheral equipment, make sure that all instructions are fully understood and observed. WARNING Caution D isrega rd i ng i nst r uct ions printed here incurs the risk of death or severe injury to persons. D isrega rd i ng i nst r uct ions printed here incurs the risk of injury to persons and/or damage to peripheral equipment.
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Quantifier Notation (Sound level and sound pressure level are expressed uniformly as sound pressure level, distinguished by the use of frequency weighting.
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Quantifier Notation of Sound Level Meter NL-42/NL-52 According to International Standards and JIS (Excerpts from ISO 1996, 3891, IEC 61672-1, JIS Z 8202, 8731) NL-42/52 notation Description Frequency weighting ISO notation IEC notation JIS notation LZ Sound level Z Lp — Lp LA A-weighted sound level A LpA — LpA LC C-weighted sound level C — — — LZeq Equivalent continuous sound level Z — — — LAeq Equivalent continuous A-weighted sound level A LAeq,T LAeq,T LAeq,T L Ceq Equ
Precautions Operate the unit only as described in this manual. The NL-42/NL-52 is a precision instrument. Protect it from shocks and vibrations. Take special care not to touch the microphone diaphragm. The diaphragm is a very thin metal film which can easily be damaged. Use only the microphone/preamplifier assembly with the number as shown on the name plate of the unit. Do not use the preamplifier of this unit with sound level meters of other models. It may cause the preamplifier to fail.
Clean the unit only by wiping it with a soft, dry cloth or, when necessary, with a cloth lightly moistened with water. Do not use any solvents, cleaning alcohol or chemical cleaning agents. Do not try to disassemble or alter the unit. In case of an apparent malfunction, do not attempt any repairs. Note the condition of the unit clearly and contact the supplier. Do not tap the LCD panel or other surfaces of the unit with a pointed object such as a pencil, screwdriver, etc.
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Contents FOR SAFETY.................................................................................v Outline ............................................................................................1 Controls and Functions ...................................................................4 Front view..................................................................................4 Bottom view ..............................................................................7 Rear view.....................
Menu list screen .......................................................................47 System (Language) .............................................................49 Display ...............................................................................52 I/O......................................................................................55 Store ...................................................................................57 Measure..........................................................
Default Settings ........................................................................... 104 Setup Files .................................................................................. 106 Resume function .................................................................... 106 Loading a start up file at startup ............................................ 106 Restoring default settings (factory default settings) ................ 107 Using setup files...................................................
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Outline The Sound Level Meter NL-42 and NL-52 are designed for sound level measurements according to the IEC standard. They support diffuse sound field measurements and also meets standard requirements when the supplied windscreen is mounted. The NL-42 and NL-52 consist of the 1/2-inch electret condenser microphone UC-52 (for NL-42) and UC-59 (for NL-52), preamplifier NH-24 (for NL-42) and NH-25 (for NL-52), and the main unit. The preamplifier can be used by separating and extending from the main body.
Outline Communication with a computer is possible via the built-in I/O connector and USB connector. Because the USB connector conforms to storage specifications, the unit will be recognized as a removable disk when connected to a computer. This allows transfer of data from the SD memory card to the computer without having to remove the SD memory card from the unit. The RS-232C interface allows sending measurement data to a printer.
Outline The Sound Level Meter NA-42/NL-52 allows the following quantity measurements. Main processing Simultaneous measurement of all items with selected time weighting (F, S) and frequency weighting (A, C, Z) characteristics Sound level Equivalent continuous sound level Sound exposure level Lp L eq LE Maximum sound level Minimum sound level Percentile sound level L max L min LN (1 to 99) 1-increment steps, max.
Controls and Functions Front view Microphone/ Preamplifier Display Operation key panel Microphone/Preamplifier The microphone/preamplifier unit can be detached from the main unit and connected via an optional extension cable. This allows use at a separate location. Be sure to use only the microphone/preamplifier assembly with the number as shown on the name plate of the unit. Otherwise the product no longer conforms to specifications. Display The display of the unit is a backlit LCD panel.
Controls and Functions Operation key panel Indicator LED START/STOP key DISPLAY key PAUSE/CONT key CAL key key LIGHT key POWER key MENU/ENTER key START/STOP key Press to start or stop the measurement (including the various processing functions). Indicator LED Lights/flashes in red or blue to indicate the operation or status of the unit. PAUSE/CONT key During a measurement, this key can be used to exclude unwanted portions from processing.
Controls and Functions MENU/ENTER key Press this key to make or finalize the setting of an item in a menu or any other setting. When the key is pressed at the measurement screen, the menu list screen comes up. CAL key (Calibration key) This key is used for calibration of the unit and for level calibration of connected equipment. keys These four keys serve for selecting and setting items on menu screens. LIGHT key This key turns on the display backlight, for easier reading in a dark location.
Controls and Functions Bottom view SD card slot DC IN connector DC IN 5-7 V SD I/O AC OUT DC OUT USB I/O AC OUT USB connector connector connector (mini B) DC OUT connector Bottom cover Bottom cover This cover protects the connectors on the bottom during transport or storage. Removing the cover gives access to the connectors shown above. Important To keep the water and dust resistant performance, close tightly the bottom cover of the unit.
Controls and Functions Rear view Seal Model plate Tripod mounting thread Battery compartment Seal The seal guarantees the dustproof and waterproof performance of the unit. Important Note that the unit will not be covered by warranty against dustproof and waterproof performances if the seal is removed. Model plate Shows various information including model number of the unit, microphone number, preamplifier number, serial number, and date of manufacture.
Preparations Power The unit can be powered by four IEC R6, size AA batteries (alkaline), the optional AC adapter NC-98 series, and the optional battery pack BP-21. Rechargeable nickel metal-hydride batteries may also be used, but the unit does not have a facility for charging the batteries. WARNING If the unit is heated during use or the unit produces smoke or smell of burning, immediately remove the batteries from the unit or disconnect the AC adapter plug from the outlet, and then contact your supplier.
Preparations Inserting the batteries 1. Remove the cover of the battery compartment as shown below. 2. Insert four IEC LR6, size AA batteries, paying attention to the polarity as indicated in the compartment. 3. Replace the cover. Push the latch in the arrow direction and then lift up to open the cover. Push IEC LR6 (size AA) battery ×4 Battery compartment Caution Take care not to reverse the (+) and (-) polarity when inserting the batteries.
Preparations The life of a set of batteries depends on usage conditions and manufacturers. Some reference values are shown below. Battery life (at 23°C) Alkaline batteries LR6 15 hours Nickel metal-hydride batteries 15 hours The life of a set of batteries is shown below when the NX-42EX is installed, Eco setting is ON, L eq calculation interval is 10 min, and Lp store interval is OFF.
Preparations AC adapter To operate the unit with the AC adapter, connect it as shown below. Important To prevent the risk of damage, do not use any AC adapter other than the NC-98 series. DC IN 5-7 V SD DC IN connector I/O AC OUT DC OUT USB Open the bottom cover AC adapter NC-98 series To AC outlet, 100 to 240 V AC, 50/60 Hz Backup battery The unit uses a backup battery (rechargeable battery) to operate the clock. While power to the unit is on, the backup battery will be charged.
Preparations Power on/off To turn the unit on Hold down the POWER key until the power-on screen appears (at least 1 second). When the screen is shown, release the POWER key. After the unit has been started, the measurement screen appears. blue red ... During start up, the indicator LED flashes red Indicator LED POWER key To turn the unit off Hold down the POWER key until the unit is turned off (several seconds). When the power-off screen appears, release the POWER key.
Preparations Power-on mode switch Opening the battery compartment as shown below gives access to a switch labeled “A-B”. Normally the “A” position is used. Setting this switch to the ''B'' position allows the unit to be turned on simply by supplying power to the DC IN connector. In this case, the POWER key on the operation key panel of the unit has no effect. A B [power-on mode] switch Important When using the unit with the switch in the “B” position, do not insert batteries.
Preparations Windscreen (WS-10, WS-15) When making outdoor measurements in windy weather or when measuring air conditioning equipment or similar, wind noise at the microphone can cause measurement errors. Such effects can be reduced by using the windscreen. Mounting the windscreen on the microphone will cause a slight change in frequency response, as shown in the Technical Notes. When using the windscreen, a windscreen correction can be executed according to the following procedure.
Preparations Diffuse sound field correction When using the unit as an ANSI compliant device, set the diffuse field correction to ON. This correction feature is designed to ensure flat frequency response in a diffuse sound field. 1. Press the MENU/ENTER key to bring up the menu list screen. keys to select [Measure] and press the MENU/ 2. Use the ENTER key. The measurement setting screen appears. 3. Use the keys to select [Diffuse Sound Field Correction] and press the MENU/ENTER key.
Preparations Memory cards (SD memory card) and program cards Measurement data can be stored on a memory card for use and further processing in a computer. Optional program cards can also be used for loading software into the unit to expand the measurement functions of the unit. Inserting a card Important Make sure that power is OFF before inserting or removing a card. Take care to insert the SD memory card with correct orientation.
Preparations Microphone extension cables (EC-04 series) Be sure to turn power to the unit OFF before separating the microphone from the main unit. To reduce measurement deviations due to refraction effects and the acoustic influence of the operator, the microphone can be detached from the unit and connected via an extension cable. Available cables are listed in the table below. Combining multiple cables is also possible.
Preparations 2. Connect the extension cable to the preamplifier and to the main unit and fasten the connectors with the fastening screw. 3. When mounting the microphone on a tripod, first fasten the microphone holder (supplied with the extension cable) to the tripod. Then insert the extension cable connector into the microphone holder.
Preparations Tripod mounting For long-term measurements, the unit can be mounted on a camera tripod. Caution Proceed carefully, to avoid dropping the unit or tipping over the tripod. When using the tripod, ensure that it is stable with the unit mounted on it. Do not carry the unit with the tripod attached. You may be injured by tripping over or hitting against the unit. Important Do not turn the screw diagonally when mounting or removing the unit from the tripod.
Preparations Connection to a printer (DPU-414) Connect the I/O connector on the bottom of the NL-42/NL-52 with an input connector of a printer DPU-414, using the optional printer cable CC-42P as shown below. The performance of other cables will not be guaranteed. Important Do not insert the cable connector to the I/O connector reversely. I/O connector Projection With the notch up, align it with the projection of the I/O connector.
Preparations Setting the software DIP switches of the DPU-414 Turn on the power while holding down the ON LINE key of the DPU-414. A printout showing the current status of the printer is produced. An example showing suitable software DIP switch settings for use of the printer with the NL-42/NL-52 is shown below. (The actual printout will be in a different font.
Preparations Connection to a level recorder (LR-07, LR-20A) and data recorder (DA-20, DA-40) Connect The AC OUT connector on the bottom of the NL-42/NL-52 with an input connector of level recorder (LR-07, LR-20A) and data recorder (DA-20, DA-40), using the optional BNC - Pin output code CC-24 as shown below. The performance of other cables will not be guaranteed.
Preparations Connection to a computer Connect the USB connector on the bottom of the NL-42/NL-52 with a USB connector of a computer, using the optional (generic) A - mini B USB cable as shown below. A memory card inserted in the unit will be recognized as a removable disk by the computer when connected via USB, without having to install a USB driver.
Preparations Setting the date and time The unit incorporates a clock which allows recording the date and time along with measurement data. Set the date and time as described below. 1. Press the MENU/ENTER key to bring up the menu list screen. 2. Use the keys to select [System (Language)] and press the MENU/ENTER key. The system screen appears. 3. Use the keys to select [Clock Setting] and press the MENU/ ENTER key. The clock setting screen appears.
Preparations Measurement in a dark location Pressing the LIGHT key will turn on the display backlight, for easier reading in a dark location. The backlight operation pattern can be controlled via a menu, as follows. 1. Press the MENU/ENTER key to bring up the menu list screen. 2. Use the keys to select [System (Language)] and press the MENU/ENTER key. The system screen appears. 3. Use the keys to select [Backlight/LCD Settings] and press the MENU/ENTER key. The backlight/LCD settings screen appears.
Preparations System screen Backlight/LCD settings screen 27
Preparations Sub channel settings To use the sub channel, you must make certain settings on a menu screen. 1. Press the MENU/ENTER key to bring up the menu list screen. 2. Use the keys to select [Measure] and press the MENU/ ENTER key. The measurement setting screen appears. 3. Use the keys to select [Sub Channel Settings] and press the MENU/ENTER key. The sub channel settings screen appears. 4. Use the keys to select [Sub Channel Settings] and press the MENU/ENTER key.
Preparations Measurement setting screen Sub channel settings screen Additional processing When the [Sub Channel Settings] is set to ON, one of the following items can be measured with main processing as simultaneous measurement function (see page 77).
Preparations Eco setting (Power-saving mode) The Eco setting enables the power saving feature. A long-time measurement can be performed using batteries only. 1. Press the MENU/ENTER key to bring up the menu list screen. 2. Use the keys to select [System (Language)] and press the MENU/ENTER key. The system screen appears. 3. Use the keys to select [Eco Setting] and press the MENU/ENTER key. The confirmation screen appears. 4. Press the MENU/ENTER key to execute the eco setting. 5.
Preparations Comparator output This is an open collector output that can be used to control external equipment. When the optional Extended Function Program NX-42EX is not installed, the comparator output cannot be set. 1. Press the MENU key to bring up the menu list screen. keys to select [I/O] and press the MENU/EN2. Use the TER key. The I/O screen appears. 3. Use the keys to select [Comparator] and press the MENU/ENTER key. The comparator screen appears. 4.
Preparations I/O screen Comparator screen Connecting an external equipment Connect the I/O connector on the bottom of the NL-42/NL-52 with an input connector of an external equipment, using the optional comparator output cable CC42C as shown below. The performance of other cables will not be guaranteed. Important Do not insert the cable connector to the I/O connector reversely. I/O connector Projection With the notch up, align it with the projection of the I/O connector.
Preparations About the comparator output When the sub channel is OFF, the comparator will not function if sub channel is selected as comparator band. The comparator signal output timing pattern is as shown below.
Preparations Language selection The language used for displaying messages and menus can be selected as follows. 1. Press the MENU/ENTER key to bring up the menu list screen. keys to select [System (Language)] and press 2. Use the the MENU/ENTER key. The system screen appears. 3. Use the keys to select [Language] and press the MENU/ENTER key. The language screen appears. keys to select the type of language and press the 4. Use the MENU/ENTER key. 5.
Calibration Before starting a measurement, the unit must be calibrated. There are two types of calibration, namely electrical calibration using an internally generated signal and acoustic calibration using an external sound calibrator. Internal calibration (Electrical calibration) Calibration is carried out using a signal generator (1 kHz, sinusoidal wave) built into the unit. 1. Press the CAL key. A calibration screen such as shown below appears.
Calibration Signal output for calibration of external equipment The normal level range setting for calibration is scale upper limit 130 dB, but for calibration of external equipment, another level range setting can also be chosen. In this case, “xx dB” flashes on the calibration value indication. The calibration value indication will always be 6 dB below the upper limit of the level range setting. Using the AC or DC output, calibration of connected equipment can be carried out as follows. 1.
Calibration Acoustic calibration (with sound calibrator) For acoustic calibration, a sound calibrator is mounted to the microphone of the sound level meter, and adjustment is performed so that the reading of the meter is equal to the sound pressure level inside the coupler. 1. Turn off the Sound Calibrator NC-74. 2. Mount the 1/2-inch adapter on the coupler of the Sound Calibrator NC-74. 1/2-inch adapter for NC-74 Sound Calibrator NC-74 3.
Calibration 5. Press the CAL key. A calibration screen such as shown below appears. Verify the “Acoustic Calibration” is displayed in the upper part of the screen. If “Internal Calibration” is shown in the upper part of the screen, press the DISPLAY key. The calibration mode will change to “Acoustic Calibration”. keys to adjust the reading of the NL-42/NL-52 to the 6. Use the value shown below. NL-42: 93.9 dB NL-52: 94.0 dB 7. Press the CAL key. The measurement screen returns. 8.
Reading the Display Measurement screen display The illustration below shows all elements of the display for explanation purposes. In actual operation, such a screen will not be shown.
Reading the Display Diffuse sound field correction Indicates that the unit has been set up for measurement in a diffuse sound field (see page 16). Back-erase function Indicates that the back-erase function has been set to 1s, 3s, or 5s (see page 73). SD memory card insertion indicator Shown when an SD memory card is inserted in the unit (see page 17). SD memory card remaining capacity Shows the remaining capacity of an inserted SD memory card.
Reading the Display Lp store interval When the store mode is Auto or Timer Auto, the set Lp store interval is displayed. (see page 87, 92) Comparator When the comparator function has been set to ON, the comparator level is shown as an orange line on the bar graph. When a signal exceeds that level, the indication [Comp] appears, and a signal is output from the I/O connector on the bottom panel (open collector) (see page 31).
Reading the Display Current date and time Shows the current date and time. Touch panel lock Indicates that the touch panel lock function has been set to ON. Touch panel operations are disabled while this symbol is displayed (see page 51). Key lock Pressing the key and key simultaneously activates the key lock condition and causes this symbol to appear. To cancel the condition, press the key and key once more together (see page 6).
Reading the Display Time weighting Indicates the main channel time weighting characteristic. F: Fast, S: Slow Under-range indication When a signal under-range condition is detected, the indication (white on black) is shown. If processed data contain signal under-range data, the indication is shown. This indication remains on the processed data display screen until the next processing measurement is started.
Reading the Display Sub channel display screen The sub channel level can be displayed on the measurement screen by setting [Sub Channel Settings] to ON on the [Measure] screen from the menu (see page 28). Main channel level display Sub channel level display Processed data display screen The measurement items, which are set to ON on the [Display] screen from the menu, will be displayed on the measurement screen by pressing the DISPLAY key (see page 52).
Reading the Display Time-Level screen While [Time-Level] is set to ON on the [Display] screen from the menu, the time-level screen will be displayed by pressing the DISPLAY key on the measurement screen (see page 53).
Reading the Display Indicator messages When keys such as START/STOP or PAUSE/CONT are pressed, indicator messages such as shown below will appear on the display for about 1 second.
Reading the Display Menu list screen When the measurement screen is displayed, pressing the MENU/ENTER key brings up the menu list screen as shown below. keys to select the desired menu and press the MENU/ Use the ENTER key. Pressing the DISPLAY key displays explanation screen of the item that has been selected. Pressing the PAUSE/CONT key switches back to the screen before the menu list screen is displayed. Pressing the START/STOP key switches back to the measurement screen.
Reading the Display The following settings of Frequency, Time Weighting and Sub Ch can be done with the touch panel. (The current setting is shown when the menu list screen is displayed.) Touch the screen directly with your finger. Frequency Selects the frequency weighting characteristic for the main channel. Each press of the “Frequency” on the screen with the finger cycles through the following settings. “A”, “C”, “Z” Time Weighting Selects the time weighting characteristic for the main channel.
Reading the Display System (Language) This screen sets the item concerning the system of the unit. Use the keys to select [System (Language)] and press the MENU/ENTER key. The system screen appears. Each item of the system screen is selected using the key. Pressing the DISPLAY key displays explanation screen of the item that has been selected. Pressing the PAUSE/CONT key switches back to the menu list screen. Pressing the START/STOP key switches back to the measurement screen.
Reading the Display Backlight/LCD Settings Displays the screen to set the function of the backlight and the LCD of the unit. Select [Backlight/LCD Settings] and press the MENU/ENTER key. The backlight/LCD settings screen appears (see page 26). Battery Type Displays the screen to select the type of battery used for the unit. The battery power corresponding to the selected battery is displayed on the measurement screen. Select [Battery type] and press the MENU/ENTER key. The battery type screen appears.
Reading the Display Index Displays the screen to set the identification number of the unit when multiple units are used in a parallel measurement. Select [Index] and press the MENU/ENTER key. The index screen appears. Use the keys to select the digit, and use the keys to set the value (1 to 255). Then press the MENU/ENTER key. Note Measurement data cannot be selected when recalling it on a unit with a different index number (viewing impossible).
Reading the Display Display This screen sets the measurement values displayed on the measurement screen. Use the keys to select [Display] and press the MENU/ENTER key. The display screen appears. Each item of the display screen is selected using the key. Pressing the DISPLAY key displays explanation screen of the item that has been selected. Pressing the PAUSE/CONT key switches back to the menu list screen. Pressing the START/STOP key switches back to the measurement screen.
Reading the Display LN1, LN2, LN3, LN4, LN5 Displays the screen to select the percentile sound level displayed on the measurement screen. To set the L1 to L99 value for LN1 to LN5, use the keys to change the value (only LN5 can be set the value from L0.1 to L99.9.). Select the percentile sound level (LN1 to LN5) and press the MENU/ENTER key. The ON/OFF setting and value setting screen appears. Use the keys to select the ON/OFF setting, and use the keys to set the value (1 to 99).
Reading the Display Output Level Range Lower Displays the screen to set the lower bound value of the bar graph on the measurement screen. Select [Output Level Range Lower] and press the MENU/ENTER key. The lower limit of bar graph screen appears. keys to set the value (20 to 80, 10 dB step). Then press the Use the MENU/ENTER key. The value of lower limit cannot be set the value set by the “Output Level Range Upper” or more.
Reading the Display I/O This screen sets the type of output signal etc. keys to select [I/O] and press the MENU/ENTER key. Use the The I/O screen appears. Each item of the I/O screen is selected using the key. Pressing the DISPLAY key displays explanation screen of the item that has been selected. Pressing the PAUSE/CONT key switches back to the menu list screen. Pressing the START/STOP key switches back to the measurement screen.
Reading the Display DC OUT Displays the screen to select whether to output the DC signal from the DC OUT connector of the unit. Select [DC OUT] and press the MENU/ENTER key. The ON/OFF setting screen appears (see page 101). Use the keys to select the ON/OFF setting and press the MENU/ ENTER key. Comparator Displays the screen to set the comparator signal output (open collector output can be used to control external equipment) from the I/O connector of the unit.
Reading the Display Store This screen sets the mode that stores the operation result data. keys to select [Store] and press the MENU/ENTER Use the key. The store screen appears. key. Each item of the store screen is selected using the Pressing the DISPLAY key displays explanation screen of the item that has been selected. Pressing the PAUSE/CONT key switches back to the menu list screen. Pressing the START/STOP key switches back to the measurement screen.
Reading the Display Store Name (common to each mode) Displays the screen to set the identification number of the store data. (0000 to 9999) Select [Store Name] and press the MENU/ENTER key. The store name screen appears. When the SD memory card has not been inserted, the identification number cannot be set. Measurement Time (Manual mode) Displays the screen to select the measurement time in the Manual mode. Select [Measurement Time] and press the MENU/ENTER key. The measurement time screen appears.
Reading the Display Start (Timer Auto mode) Displays the screen to set the measurement start time in the Timer Auto mode. Select [Start] and press the MENU/ENTER key. The start time setting screen appears. When the start time setting screen is displayed for the first time, current time is indicated. Stop (Timer Auto mode) Displays the screen to set the measurement stop time in the Timer Auto mode. Select [Stop] and press the MENU/ENTER key. The stop time setting screen appears.
Reading the Display Measure This screen sets the correction of the measurement etc. Use the keys to select [Measure] and press the MENU/ENTER key. The measurement setting screen appears. Each item of the measurement setting screen is selected using the key. Pressing the DISPLAY key displays explanation screen of the item that has been selected. Pressing the PAUSE/CONT key switches back to the menu list screen. Pressing the START/STOP key switches back to the measurement screen.
Reading the Display Time Weighting Displays the screen to select the time weighting characteristics for the main channel. Select [Time Weighting] and press the MENU/ENTER key. The time weighting screen appears. Use the keys to select the time weighting characteristics (F[Fast], S[Slow]) and press the MENU/ENTER key. The same can be performed using the touch panel on the menu list screen. Windscreen Correction Displays the screen to select the type of windscreen for windscreen correction.
Reading the Display Save/Print The measurement data or recall data displayed on the screen can be saved or printed on the save/print screen. Use the keys to select [Save/Print] and press the MENU/ENTER key. The save/print screen appears. Each item of the save/print screen is selected using the key. Store data Stores the displayed measurement data. This is displayed when Manual measurement (processing) data exist. Select [Store data] and press the MENU/ENTER key.
Reading the Display Option This screen switches the function from the unit to each program when an optional program is installed. Use the keys to select [Option] and press the MENU/ENTER key. The option screen appears. Each item of the switch function screen is selected using the key. Pressing the PAUSE/CONT key switches back to the menu list screen. Pressing the START/STOP key switches back to the measurement screen. Option Select a desired program name to switch the function.
Reading the Display Recall This screen displays a stored data on internal memory or SD memory card. Use the keys to select [Recall] and press the MENU/ENTER key. The recall screen appears. Use the keys to select a save location of data and the keys to select a data file. Pressing the PAUSE/CONT key switches back to the menu list screen. Pressing the START/STOP key switches back to the measurement screen.
Reading the Display Select data file and press the MENU/ENTER key. The file processing screen appears. Confirm the data Displays the measurement data of the selected data file. Select [Confirm the data] and press the MENU/ENTER key. Delete the data Deletes the selected data file. Select [Delete the data] and press the MENU/ENTER key. The confirmation screen appears. Select [Yes] and press the MENU/ENTER key.
Reading the Display Copy to the card (only internal memory data) Copies the selected internal memory data file to the inserted SD memory card. Select [Copy to the card] and press the MENU/ENTER key. The store name set screen appears. Set the store name (number of four digits) at the copy destination and press the MENU/ENTER key. Cancel Shuts the file processing screen. Select [Cancel] and press the MENU/ENTER key.
Reading the Display WR Select this screen to record the waveform using optional program NX42WR. If NX-42WR is not installed, it is not possible to select this screen. For details, please refer to the instruction manual of Waveform Recording Program NX-42WR.
Reading the Display MENU list items System (Language) Read/Save Settings [v]---------- Load Default Settings Internal Memory---- List of setting groups on internal memory Startup File SD---- List of setting groups on SD memory card Clock Settings Backlight/LCD Settings [v]-----Backlight Auto Off Backlight brightness LCD Auto Off (Auto Store) Battery Type---- Alkaline/Ni-MH Card Format Index Program Information [v]--------Model, Version Touch Panel Lock Eco Setting Language---/English Display Leq, LE, Lmax
Measurement When using the unit in a mode other than “sound level measurement”, all processing functions provided by the unit (L eq, LE , L max, L min, L N) are carried out simultaneously. (However, for the sub channel, only the additional processing function set to “ON” in the menu list screen is carried out.) For example, when equivalent continuous sound level measurement is selected, the sound exposure level and percentile sound level are also determined.
Measurement 2. Press the MENU/ENTER key and select the frequency weighting characteristic on the menu list screen. For normal sound level measurements, select the “A” setting. When Z is selected, the sound pressure level from 10 Hz to 20 kHz is measured with flat characteristics. When C is selected, the sound pressure level from 31.5 Hz to 8 kHz is measured with flat characteristics. The frequency weighting characteristic can be set even on the measurement setting screen in the menu list screen.
Measurement Equivalent continuous sound level (Leq) measurement The procedure for equivalent continuous sound level measurement is described below. Preparations as described in the “Preparations” chapter must be completed first. 1. Turn power to the unit on. 2. Press the MENU/ENTER key and select the frequency weighting characteristic on the menu list screen. For normal sound level measurements, select the “A” setting.
Measurement 7. Use the keys to select [ON] and press the MENU/ENTER key. Press the PAUSE/CONT key to return to the menu list screen. 8. For information about how to store data, refer to the section starting on page 79. 9. Set the measurement time. keys to select [Store] and press the MENU/ Use the ENTER key. The store screen appears. 10. Use the keys to select [Store Mode] and press the MENU/ENTER key. The store mode screen appears. 11. Use the keys to select [Manual] and press the MENU/ENTER key. 12.
Measurement 16. Use the keys to select the delayed measurement time (OFF, 1s [second], 3s, 5s, 10s) and press the MENU/ENTER key. Press the PAUSE/CONT key to return to the menu list screen. START/STOP key pressed Preset delayed measurement time Measurement start Leq time Time Time graph for delayed measurement time 17. If necessary, set the back erase time. When PAUSE/CONT key is pressed while performing a measurement, the previous data is removed for the preset back erase time.
Measurement 21. Press the START/STOP key to start the measurement. At this point, previous measurement values are cleared. While the measurement is in progress, the symbol flashes and the elapsed time is displayed. In addition, the indicator LED flashes red. When the measurement time set in step 13 has elapsed, the measurement is terminated automatically. To terminate the measurement before the allocated time, press the START/STOP key.
Measurement Data excluded by back-erase function (ON, 5 s) Time-Level screen 22. Press the DISPLAY key to switch the display. LAeq means that the equivalent continuous sound level is displayed. If LAeq is not shown, check whether L eq is set to ON on the setting screen. If the indication OVER is shown, the processed data include an overload condition. If the indication UNDER is shown, the processed data include an under-range condition.
Measurement Sound exposure level (LAE), Maximum sound level (Lmax), Minimum sound level (Lmin) and Percentile sound level (LN) measurement The sound exposure level (LAE), maximum sound level (L max), minimum sound level (L min) and percentile sound level (LN ) are all measured at the same time as the equivalent continuous sound level (L eq).
Measurement Additional processing value measurement When the sub channel is ON, one of the following processing functions is available in addition to L eq, LE , L max, L min, and L N. Equivalent continuous C-weighted sound level L Ceq C-weighted peak sound level Z-weighted peak sound level Impulse equivalent continuous sound level Tact-max A-weighted sound level L Cpeak L Zpeak LAIeq LAtm5 Note When the optional Extended Function Program NX-42EX is not installed, LAIeq and LAtm5 cannot be measured.
Measurement Additional processing value setting procedure Set the sub channel according to the desired additional processing beforehand (see page 28). 1. Press the MENU/ENTER key to bring up the menu list screen. 2. Use the keys to select [Measure] and press the MENU/ ENTER key. The measurement setting screen appears. 3. Use the keys to select [Sub Channel Settings] and press the MENU/ENTER key. The sub channel settings screen appears. 4.
Store Operation The NL-42/NL-52 can store measurement data (processed data such as sound level and equivalent continuous sound level, and measurement parameters such as frequency weighting and time weighting characteristics) in the internal memory or on SD memory card. This chapter describes how to store data in memory and how to recall data from memory. There are three different modes of storing data, as listed below.
Store Operation Auto (only when the NX-42EX is installed) The processing result which is obtained using the selected sound level and specified interval by the sampling interval setting will be recorded continuously. Lp store The sound level of up to 1,000 hours can be stored continuously and automatically. This function becomes available when an SD memory card is inserted. This is useful when recording the sound level waveform.
Store Operation Timer Auto (only when the NX-42EX is installed) Executes Auto store using the set start time and recurrence interval of trigger event. Important Never turn off power to the unit or remove the SD memory card while a store operation is in progress. Otherwise internal data can be destroyed. When an SD memory card is inserted in the memory card slot of the unit, use of the internal memory for store is not possible.
Store Operation Manual mode operation Memory store When an operator performs store operation on the confirmation screen displayed after processing finishes, each processed data will be stored. If no SD memory card is inserted, the data will be stored in the internal memory of the unit. If an SD memory card is inserted, the data will automatically be stored on the card. The procedure is as follows. 1. Press the POWER key to turn the unit on. 2. Press the MENU/ENTER key to bring up the menu list screen.
Store Operation 6. Specify the store name (number of four digits: when SD memory card is inserted). 6-1. Use the keys to select [Store Name] and press the MENU/ ENTER key. The store name screen appears. 6-2. Use the keys to select the first two digits, and use the keys to set the value. 6-3. Use the keys to select the final two digits, and use the keys to set the value. Then press the MENU/ENTER key. 7. Set the measurement time. 7-1.
Store Operation 10. Start a measurement. When it finishes, a confirmation screen will be displayed. Select “Store data” and press the MENU/ENTER key to store the processing results. The store process takes about 1 second. When it is completed, the address is incremented by one step.
Store Operation Recalling stored data The procedure for recalling data stored in memory using Manual mode is described below. 1. Press the MENU/ENTER key to bring up the menu list screen. 2. Use the keys to select [Recall] and press the MENU/ ENTER key. The file selection screen appears. keys to select the data you want to recall and press the 3. Use the MENU/ENTER key. keys to select [Confirm the data] and press the MENU/ 4. Use the ENTER key. The data stored in memory are displayed.
Store Operation Auto mode operation Memory store The optional Extended Function Program NX-42EX should be installed. An SD memory card should be inserted. With the Auto mode, L p store and L eq store are executed simultaneously (separate operation also possible). The procedure for storing data using Auto mode is as follows. Confirm the SD memory card has been inserted in the card slot. 1. Press the POWER key to turn the unit on. 2. Press the MENU/ENTER key to bring up the menu list screen.
Store Operation 6. Specify the store name. 6-1. Use the keys to select [Store name] and press the MENU/ ENTER key. The store name screen appears. keys to select the first two digits, and use the 6-2. Use the keys to set the value. keys to select the final two digits, and use the 6-3. Use the keys to set the value. Then press the MENU/ENTER key. 7. Set the total measurement time. 7-1. Use the keys to select [Total Measurement Time] and press the MENU/ENTER key. The total measurement time screen appears.
Store Operation 9-3. When “Manual” is selected, [User setting] is displayed on the store screen. Press the MENU/ENTER key. 9-4. The L eq calculation interval setting screen appears. Set arbitrary interval (At most for 24 hours). If the L eq calculation interval set to OFF, L eq is not stored. Note Both Lp store interval and L eq calculation interval can not be set to OFF. 10. Press the START/STOP key to return to the measurement screen. 11. Press the START/STOP key to start measurement.
Store Operation Marker When the store mode is set to Auto or Timer Auto, and the L p store interval is specified, a marker can be added to the data. 1. Select [Store] from the menu list screen and set the store mode to Auto or Timer Auto. Also set the required measurement parameters such as L p store interval. 2. Press the START/STOP key to set the unit to the measurement condition. 3. The (marker 1) and (marker 2) keys now function as markers.
Store Operation Recalling stored data The procedure for recalling data stored in memory using Auto mode is described below. 1. Press the MENU/ENTER key to bring up the menu list screen. 2. Use the keys to select [Recall] and press the MENU/ ENTER key. The file selection screen appears. keys to select the data you want to recall and press the 3. Use the MENU/ENTER key. keys to select [Confirm the data] and press the MENU/ 4. Use the ENTER key. The data stored in memory are displayed.
Store Operation Timer Auto mode operation Memory store The optional Extended Function Program NX-42EX should be installed. An SD memory card should be inserted. With the Timer Auto mode, L p store and L eq store are executed simultaneously (separate operation also possible). The procedure for storing data using Timer Auto mode is as follows. Confirm the SD memory card has been inserted in the card slot. 1. Press the POWER key to turn the unit on. 2.
Store Operation 6. Specify the store name. 6-1. Use the keys to select [Store Name] and press the MENU/ ENTER key. The store name screen appears. 6-2. Use the keys to select the first two digits, and use the keys to set the value. keys to select the final two digits, and use the 6-3. Use the keys to set the value. Then press the MENU/ENTER key. 7. Set the Lp store interval. 7-1. Use the keys to select [Lp Store Interval] and press the MENU/ENTER key. The Lp store interval screen appears.
Store Operation 9. Set the start time. The measurement is started at the preset start time. 9-1. Use the keys to select [Start] and press the MENU/ENTER key. The start time setting screen appears. When the start time setting screen is displayed for the first time, current time is indicated. 9-2. Use the keys to select the setting parameter (year, month, day, hour, minute), and use the keys to set the value. 9-3. Repeat the step 9-2. When all the settings are completed, press the MENU/ENTER key. 10.
Store Operation 13. Press the START/STOP key. Measurement will start at the preset start time. The measurement value will be stored automatically at every interval set for L p store interval and L eq calculation interval. When it is completed, the address is incremented by one step. Measurement will stop at the preset stop time. To stop the process earlier, press the START/STOP key.
Store Operation Data size information The maximum number of data sets that can be stored under one store name is 1000. About the store data format Data stored on the SD memory card are in CSV format. Various files and subdirectories are created on the card. The store name specified on the menu screen is created as a 4-digit number under the subdirectory name. The file of one per one address is made.
Store Operation About SD memory cards The memory cards that can be used in this unit are SD memory cards. Be sure to use optional SD memory cards provided by Rion. SD memory cards even from the same manufacturer and of the same type exhibit certain variations in specifications which may cause problems. For this reason, be sure to use only the SD memory cards provided by Rion. The performance of other cards will not be guaranteed.
Store Operation Data recovery If an unexpected power failure occurs, the data may be damaged. In such a case, turn the unit on without removing the SD memory card since the unit is equipped with a data recovery function. However, please note that the recovery of all data is not guaranteed. Formatting on a computer cannot recover the data. Example: For the case of L p 100 ms, the data of approximately up to the last 10 minutes can be recovered.
Store Operation Screen hard copy When you press the key of keys while holding down the DISPLAY key, the “Screenshot was saved to the card” message is displayed and the current screen contents will be saved as a bitmap file on the SD memory card. Store target folder: File name: File name extension: Data capacity: 98 \Screenshot\ Time at which the file was stored .
Input/Output Connectors AC OUT connector Set the frequency weighting characteristic of the signal output from the AC OUT connector of the unit. 1. Press the MENU/ENTER key to bring up the menu list screen. keys to select [I/O] and press the MENU/EN2. Use the TER key. The I/O screen appears. 3. Use the keys to select [AC OUT] and press the MENU/ENTER key. The AC OUT setting screen appears. 4.
Input/Output Connectors The relationship between the display value shown by the unit and the output voltage is indicated below. When the unit is set to the calibration mode, the output signal (output level range upper 120 dB - 6 dB = 114 dB, 1000 Hz sinusoidal wave) is 0.5 Vrms. 10 Output voltage (Vrms) 1 0.1 0.01 0.
Input/Output Connectors DC OUT connector Set the frequency weighting characteristic of the signal output from the DC OUT connector of the unit. 1. Press the MENU/ENTER key to bring up the menu list screen. keys to select [I/O] and press the MENU/EN2. Use the TER key. The menu list screen appears. 3. Use the keys to select [DC OUT] and press the MENU/ENTER key. The ON/OFF setting screen appears. 4. Use the key.
Input/Output Connectors The relationship between the display value shown by the unit and the output voltage is indicated below. When the unit is set to the calibration mode, the output signal (output level range upper 120 dB - 6 dB = 114 dB) is 2.35 V. 3.5 Output voltage (V) 3.0 2.5 2.0 1.5 1.0 0.
Input/Output Connectors I/O connector The I/O connector is located at the bottom of the unit and used for RS-232C communication or comparator output. To use this connector for RS-232C communication and connect to a printer, see page 21. For comparator output, see page 32. Note The RS-232C communication and the comparator output cannot be used at the same time. Comparator output approx.
Default Settings The factory default settings of the unit are listed below. Main channel frequency weighting .................. A Main channel time weighting ........................... F(Fast) Output level range upper .................................. 130 dB Output level range lower .................................. 30 dB Calibration mode ............................................. Internal Back erase ........................................................ OFF Delay time ..............................
Default Settings Communication interface ................................. OFF Baud rate.......................................................... 9600 bps Backlight auto off ............................................ 30 s Backlight brightness ........................................ 2 LCD auto off at auto store................................ OFF Index ................................................................ 1 Battery type .....................................................
Setup Files Resume function When power to the unit is turned on, the measurement screen appears. The settings active at this point are the same as were selected before the unit was last turned off (resume function). Note When the unit is started while a start up file exists in the internal memory, the start up file load function (see the following description) will be executed first.
Setup Files Restoring default settings (factory default settings) Follow the steps below to restore the default settings. keys to select [System (Language)] and press 1. Use the the MENU/ENTER key. The system screen appears. 2. Use the keys to select [Read/Save setting] and press the MENU/ ENTER key. The setting operation screen appears. 3. Use the keys to select [Load Default Settings] and press the MENU/ENTER key. The confirmation screen appears. 4.
Setup Files Using setup files Setup files enable the following functions. • Establish settings quickly and precisely by loading from a file prepared beforehand and stored on internal memory or SD memory card • Return settings that were accidentally changed to the previous condition by loading from a file stored on internal memory or SD memory card Setup files can be saved up to five in the internal memory of the unit and up to five in an SD memory card. Saving the current settings 1.
Setup Files Loading a setup file Note When you load settings from a file, the current settings will be overwritten. If necessary, you should save the current settings before loading a new set of settings. 1. Use the keys to select [System (Language)] and press the MENU/ENTER key. The system screen appears. 2. Use the keys to select [Read/Save setting] and press the MENU/ ENTER key. The setting operation screen appears. 3. Use the keys to select the desired number and press the MENU/ ENTER key.
Setup Files Copying a setup file 1. Use the keys to select [System (Language)] and press the MENU/ENTER key. The system screen appears. keys to select [Read/Save setting] and press the MENU/ 2. Use the ENTER key. The setting operation screen appears. 3. Use the keys to select the desired number and press the MENU/ ENTER key. The setting file processing screen appears. 4. Use the keys to select [Copy] and press the MENU/ENTER key. 5.
Setup Files Setting a start up file When a setting is saved in a start up file, the unit can be started using the setting. 1. Set the unit to the intended condition, so that measurement parameters and other settings are as desired. keys to select [System (Language)] and press 2. Use the the MENU/ENTER key. The system screen appears. keys to select [Read/Save setting] and press the MENU/ 3. Use the ENTER key. The setting operation screen appears. keys to select [Startup File None] and press the MENU/ 4.
Optional Accessories Microphone extension cables (EC-04 series) For enhanced measurement accuracy, the microphone can be detached from the unit and connected via an extension cable. This will reduce measurement deviations due to refraction effects of the unit or the acoustic influence of the operator. Six different cable types with lengths from 2 to 100 meters are available, as listed in the table below. It is also possible to combine multiple cables.
Optional Accessories Printer DPU-414 Data stored in the memory of the unit and on SD memory card can be printed out on a printer. You can also produce hard copy of measurement screens. (The printer, printer paper, and printer cable are options.) To print measurement data, turn the unit and the printer on and set the printer to the online state. The steps described in the chapter “Preparations” (page 9) should be completed.
Optional Accessories Printing stored data The steps for printing hard copy of a stored data are described below. 1. Press the MENU/ENTER key to bring up the menu list screen. 2. Use the keys to select [Recall] and press the MENU/ ENTER key. The recall screen appears. keys to select the desired data and press the 3. Use the MENU/ENTER key. The data processing screen appears. 4. Use the keys to select [Confirm the data] and press the MENU/ENTER key. The stored data screen appears. 5.
Optional Accessories 6. Use the keys to select [Save/Print] and press the MENU/ ENTER key. The save/print screen appears. 7. Use the keys to select [Range Setting Print] and press the MENU/ENTER key. The range setting print screen appears. 8. Set the [Start Address] and [End Address] and then select [Print Execution] and press the ENTER key.
Optional Accessories Level recorder LR-07/LR-20A By connecting a level recorder to the unit, the sound level changes over time can be recorded. Sound level recording The procedure for recording sound level changes over time is described below. Turn power to the NL-42/NL-52 and the level recorder on. The steps described in the chapter “Preparations” (page 9) should be completed. For details about level recorder operation, refer to the documentation supplied with the level recorder. 1.
Optional Accessories 8. Press the CAL key once more to return the NL-42/NL-52 to the measurement mode. 9. Set the time weighting characteristic at the level recorder. 10. Set the [Output Level Range Upper] and [Output Level Range Lower] on the [Display] screen. The [Output Level Range Upper] setting of the NL-42/NL-52 becomes the scale upper limit of the level recorder.
Optional Accessories Program options The unit can make use of a range of program options. For details on usage, refer to the documentation supplied with the respective program.
Specifications Applicable standards NL-42 IEC 61672-1:2002 Class 2 ANSI S1.4-1983 Type 2 ANSI S1.4-1985 Type 2 ANSI S1.43-1997 Type 2 JIS C 1509-1:2005 Class 2 NL-52 IEC 61672-1:2002 Class 1 ANSI S1.4-1983 Type 1 ANSI S1.4-1985 Type 1 ANSI S1.
Specifications Additional processing One of the following measurements can also be selected for simultaneous processing with main processing. Equivalent continuous C-weighted sound level L Ceq C-weighted peak sound level L Cpeak Z-weighted peak sound level L Zpeak Impulse equivalent continuous sound level LAIeq Tact-max A-weighted sound level LAtm5 The frequency response of additional processing is associated with that of sub channel.
Specifications Measurement range Inherent Noise Total range Linear operating range A-weighting: 25 dB to 130 dB C-weighting: 33 dB to 130 dB Z-weighting: 38 dB to 130 dB C-weighted peak sound level: 55 dB to 141 dB Z-weighting peak sound level: 60 dB to 141 dB NL-42 NL-52 A-weighting: 19 dB or less 17 dB or less C-weighting: 27 dB or less 25 dB or less Z-weighting: 32 dB or less 30 dB or less 25 dB to 138 dB (A weighting, 1 kHz) All-pass (A-weighting) 113 dB Measurement frequency range 20 Hz to 8 kHz (
Specifications Calibration Electrical calibration with signal from built-in oscillator Calibration frequency: 1 kHz Calibration sound pressure level: 94 dB Acoustic calibration using sound calibrator NC-74 Calibration frequency: 1 kHz Calibration sound pressure level: 94 dB (NL-52) 93.9 dB (NL-42) Correction functions Windscreen correction Reduces influence of mounted windscreen on frequency response characteristics. Turning on/off the correction function is done from the menu screen.
Specifications Display Backlit semitransparent color TFT LCD display WQVGA (400 × 240 dots) * LCD is equipped with the touch panel (capacitance type) control function. Bar graph update frequency 100 ms Numeric display update frequency 1s Manual store Measurement result and measurement start time are stored manually on an address to address basis.
Specifications DC/AC simultaneous output Enables simultaneous output of DC output and AC output. USB Mass storage class Connected to a computer as a storage device, and recognized as a removable disk. Communication device class Allows control with communication commands using communication device class. However, the settings related to store data transfer and store operation cannot be handled by communication commands. Printout Prints measurement results via the dedicated printer DPU-414.
Specifications Water and dust resistant performance IP Rating IP 54 (except microphone unit) Protection against harmful dust and water splashing from any direction. Dimensions Approx. 250 × 76 × 33 mm Weight Approx.
Specifications Optional accessories SD Card 512 MB SD-512M SD Card 2 GB SD-2G (2 GByte) AC adapter (100 V to 240 V) NC-98 series Battery pack BP-21 Microphone extension cable EC-04 series BNC - Pin output code CC-24 Comparator output cable CC-42C Printer DPU-414 Printer cable CC-42P RS-232C serial I/O cable CC-42R USB cable (A - mini B) Sound calibrator NC-74 Windscreen for outdoor WS-15 Sound level meter tripod ST-80 Data recorder DA-20/DA-40 Level recorder LR-07/LR-20A Data management software for enviro
Specifications 250 76 Front view Side view Rear view 33 Bottom view Unit: mm Dimensional Drawings 127
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