USER GUIDE MODEL GX900 – GRAPHICAL DMM MODEL GX930 – DMM / DIGITAL OSCILLOSCOPE
Extech Instruments INTRODUCTION Thank you for selecting the Extech Model GX900 True RMS Digital Multimeter or GX930 True RMS Digital Multimeter with Digital Oscilloscope. These devices are shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Extech Instruments is an ISO‐9001 certified company. Please visit the Extech Instruments website (www.extech.com) for the latest versions of Manuals, Software, Product updates, and other current information.
Extech Instruments GX930 ‐ KEY FEATURES Measures AC/DC Voltage/Current, Resistance, Capacitance, Frequency (electrical and electronic), Duty Cycle, Diode, Insulation, Continuity, and Thermocouple Temperature New design, compact size/portable TFT color LCD with clear and stable waveform display Real time sample rate: 500 — 50M samples/second Internal memory storage: 3000 data points Trigger function: Rising edge, Falling edge Automatic search utility 10 sets of waveform storage/
Extech Instruments TABLE OF CONTENTS INTRODUCTION................................................................................................. 2 GX900 ‐ KEY FEATURES ..................................................................................... 2 GX930 ‐ KEY FEATURES ..................................................................................... 3 TABLE OF CONTENTS ........................................................................................ 4 SAFETY ............................
Extech Instruments DC/AC MILLIVOLT MEASUREMENTS .............................................................. 18 CURRENT CLAMP MEASUREMENTS ............................................................... 19 DC CURRENT MEASUREMENTS ...................................................................... 20 AC CURRENT MEASUREMENTS ...................................................................... 21 RESISTANCE MEASUREMENTS........................................................................
Extech Instruments ZOOMING ON TREND DATA ........................................................................... 34 METER SETUP OPTIONS................................................................................... 34 RESET THE METER SETUP OPTIONS ................................................................ 34 METER INFORMATION SCREEN ...................................................................... 35 SETTING THE EVENT THRESHOLD VALUE .......................................................
Extech Instruments SAFETY INTERNATIONAL SAFETY SYMBOLS This symbol, adjacent to another symbol or terminal, indicates the user must refer to the manual for further information.
Extech Instruments CAUTIONS Improper use of this meter can cause damage, shock, injury or death. Read and understand this user manual before operating the meter. Always remove the test leads before replacing the battery or fuses. Inspect the condition of the test leads and the meter itself for any damage before operating the meter. Use great care when making measurements if the voltages are greater than 25VAC rms or 35VDC. These voltages are considered a shock hazard.
Extech Instruments SAFETY INSTRUCTIONS – INPUT PROTECTION LIMITS This meter has been designed for safe use, but must be operated with caution. The rules listed in this safety section must be carefully followed for safe operation. 1.
Extech Instruments FCC COMPLIANCE This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference. 2. This device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules.
Extech Instruments INDUSTRY CANADA (IC) COMPLIANCE This device complies with Industry Canada license‐exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. IC Radiation Exposure Statement 1. This transmitter must not be co‐located or operating in conjunction with any other antenna or transmitter. 2.
Extech Instruments DIGITAL MULTIMETER INSTRUCTIONS DESCRIPTIONS METER DESCRIPTION 1. LCD display 2. Sub‐function keys F1, F2, F3, and F4 1 3. Data HOLD button 2 3 4 4. MAX‐MIN memory button 5. Rotary Primary Function Select Switch 11 12 10 6. Input jack for Amperes (A) 7. Input jack mA, uA (milli‐ & micro‐Amperes) 8. Input jack (COM) negative 5 9. Input jack (positive) for all functions 6 9 10. Display Backlight control 11. Information button 7 8 12.
Extech Instruments KEYPAD DESCRIPTION The meter’s 12 push‐button keypad activates features, augments functions selected by the rotary switch, and allows the navigation of the displayed menu structure F1‐F2‐F3‐F4 keys Selects sub‐functions related to the currently selected primary mode set by the rotary switch Cursor buttons Use the cursor buttons to selected items in a menu tree, adjust display contrast, scroll information, and perform data entry HOLD button Freezes the displayed reading and, if desired, sa
Extech Instruments LCD DISPLAY DESCRIPTION 1. Soft key labels indicate the function of the button just below the displayed label. 2. Bar graph Analog display for the input signal (See the "Bar Graph" section for more information). 3. Primary measurement display area* (minus sign indicates a negative reading). 4. Range indicates the meter’s present range and the ranging mode (auto or manual). 5. Battery level indicates the battery charge level. 6.
Extech Instruments QUICK START GUIDE Step One: Ensure that batteries are installed and are fresh Step Two: Carefully read the Safety section of this Instruction Manual Step Three: Check the Table of Contents to find the section of this Instruction Manual related to the desired test Step Four: Connect the test leads to the meter and to the device under test as described in this Instruction Manual’s section related to the test in question Step Five: Safely perform the test as described in this Instruction Ma
Extech Instruments MEASUREMENTS WARNING: Risk of electrocution. High‐voltage circuits, both AC and DC, are very dangerous and should be measured with great care. 1. ALWAYS turn the function switch to the OFF position when the meter is not in use. 2. If OL appears in the display during a measurement, the value exceeds the selected range. Change to a higher range or use the Auto range mode. DC VOLTAGE MEASUREMENTS CAUTION: Do not measure DC voltages if a motor on the circuit is being switched ON or OFF.
Extech Instruments AC VOLTAGE MEASUREMENTS WARNING: Risk of Electrocution. The probe tips may not be long enough to contact the live parts inside some 240V outlets for appliances because the contacts are recessed deep in the outlets. As a result, the reading may show 0 volts when the outlet actually has voltage on it. Make sure the probe tips are touching the metal contacts inside the outlet before assuming that no voltage is present.
Extech Instruments LOW PASS FILTER FOR ACV MEASUREMENTS The meter is equipped with a Low Pass Filter for AC measurements. To activate the filter please follow the steps below: 1. Set the rotary switch to the V~ position 2. Press the F1 key (MENU) 3. Move the menu selector to the LOW PASS field and then press OK 4. Select LPF (Low Pass Filter) and then press OK 5. Press the F3 key (RANGE) and then press the F2 key (MANUAL) 6.
Extech Instruments CURRENT CLAMP MEASUREMENTS 1. This meter offers remote current clamp measurement functionality. 2. Set the rotary switch to the mV position. 3. Press the F1 key (MENU), move the menu selector to the item labeled CLAMP DC/AC, and then press the OK key. 4. Select the item labeled RANGE (0.1~100mV/A) and then press the OK key. 5. Connect the remote clamp to the input terminal jacks ensuring proper polarity.
Extech Instruments DC CURRENT MEASUREMENTS CAUTION: Do not make 20A current measurements for longer than 30 seconds. Exceeding 30 seconds may cause damage to the meter and/or the test leads. 1. Insert black test lead banana plug into the negative COM jack. 2. For current measurements up to 5000µA DC, set the function switch to the µA position and insert the red test lead banana plug into the µA/mA jack. Press the F1 key (MENU) and select uADC, Press the OK key. 3.
Extech Instruments AC CURRENT MEASUREMENTS CAUTION: Do not make 20A current measurements for longer than 30 seconds. Exceeding 30 seconds may cause damage to the meter and/or the test leads. 1. Insert the black test lead banana plug into the negative COM jack. 2. For current measurements up to 5000µA AC, set the function switch to the µA position and insert the red test lead banana plug into the µA/mA jack. Press the F1 key (MENU) and select uAAC, Press the OK key. 3.
Extech Instruments RESISTANCE MEASUREMENTS WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any resistance measurements. Remove the batteries and unplug the line cords. 1. Set the function switch to the Ω CAP position. 2. Insert the black test lead banana plug into the negative COM jack. 3. Insert the red test lead banana plug into the positive Ω jack 4. Touch the test probe tips across the circuit or part under test.
Extech Instruments CONTINUITY CHECK WARNING: To avoid electric shock, never measure continuity on circuits or wires that have voltage on them. 1. Set the function switch to the Ω CAP position. 2. Press the F1 key (MENU), move the menu selector to the RESISTANCE, and then press the OK key 3. Move the menu selector to the item labeled CONTINUITY and press the OK key 4. Insert the black lead banana plug into the negative COM jack. 5. Insert the red test lead banana plug into the positive jack. 6.
Extech Instruments TEMPERATURE MEASUREMENTS 1. Set the function switch to the TEMP position. 2. Press the F1 key (MENU), move the menu selector to the item labeled TEMP, and then press the OK key 3. Move the menu selector to menu item labeled FAHRENHEIT, Celsius, or Kelvin and then press the OK key 4. Insert the Temperature Probe into the input jacks ensuring correct polarity. 5. Touch the Temperature Probe head to the device under test.
Extech Instruments CAPACITANCE MEASUREMENTS WARNING: To avoid electric shock, disconnect power to the unit under test and discharge all capacitors before taking any capacitance measurements. Remove the batteries and unplug the line cords. 1. Set the rotary function switch to the CAP position. 2. Press the F1 key (MENU), move the menu selector to the menu item labeled CAPACITANCE, and then press the OK key. 3. Select CAPACITANCE and then press the OK key. 4.
Extech Instruments RPM MEASUREMENTS 1. Set the rotary function switch to the RPM position. 2. Insert the black lead banana plug into the negative COM jack and the red test lead banana plug into the positive V jack. 3. Touch the test probe tips to the circuit under test. 4. Read the RPM value on the display. COUNTER MEASUREMENTS 1. Set the rotary function switch to the RPM position. 2. Press the F1 key (MENU), move the menu selector to the item labeled COUNTER, and then press the OK key 3.
Extech Instruments FUNCTIONS AND FEATURES FUNCTION MENU BASICS Each primary measurement function (selected by rotary dial position) has a number of optional sub‐functions or modes accessed by pressing the F1 key (MENU). A typical menu is shown here. Menu selection is indicated by the dark colored square (designated as the ‘menu selector’ in this Instruction Manual) to the left of the menu item.
Extech Instruments AUTOMATIC AND MANUAL RANGING Press the F3 key (RANGE) to open the Range menu. Press F1 key (AUTO) to enable the Auto Range mode. Press F2 key (MANUAL) to enable the Manual Range mode. In the Manual Range mode, move the menu selector to the desired range. AC AND DC SIGNALS This meter is capable of displaying both AC and DC signal components (voltage or current) as two separate readings or one AC+DC (RMS) value combined.
Extech Instruments MINIMUM (MIN) AND MAXIMUM (MAX) READINGS The MIN‐MAX recording mode captures minimum, maximum, and average measurement values. When the measurement falls below the recorded minimum value or above the recorded maximum value, the meter beeps and records the new value. The meter stores the elapsed time since the recording session was started at the same time. The MIN‐MAX mode also calculates an average of all readings taken since the MIN‐MAX mode was activated.
Extech Instruments CAPTURING PEAK VALUES To activate the PEAK Mode, press the F1 key (MENU). Move the menu selector to the menu item labeled PEAK/CREST F (Crest Factor) and then press the OK key. Move the menu selector to the PEAK or the CREST F label and then press OK to start the PEAK recording session. RELATIVE MODE To activate the Relative mode, press the F1 key (MENU) and move the menu selector next to the menu item labeled REL/REL% and then press the OK key.
Extech Instruments DATA HOLD AND AUTO‐HOLD MODE To freeze the display for any function, press the HOLD key. Pressing the F2 key (AUTO HOLD) activates the Auto Hold mode (if the meter is not in the PEAK, MIN‐MAX, or Record modes). Auto‐Hold monitors the input signal and updates the display and, if enabled, sounds the beeper each time a new stable measurement is detected. A stable measurement is one that does not vary more than a selected adjustable percentage (Auto‐Hold threshold) for at least one second.
Extech Instruments VIEW TREND DATA Viewing data stored in the meter’s memory is performed through the SAVE menu as described below: 1. Press the F2 key (SAVE) and select menu item MEMORY and Press the OK key. 2. Select menu item VIEW and Press the OK key. 3. Select menu item LOG and Press the OK key. If there are previously stored records, press the F1 key (PREV) to page through them or Press the F2 key (NEXT) to scroll in the opposite direction.
Extech Instruments RECORDING MEASUREMENTS (DATALOGGING) The meter’s datalogger collects measurement information over a user‐specified duration (sampling rate). A datalogging recording session is made up of one or more measurement records with each record including a measurement summary representing the duration of the recording session. 1. Set the meter rotary switch to the meter setting to be logged. (Example V~ to log AC volts). 2. Connect the black lead to the COM jack and the Red lead to the V jack.
Extech Instruments ZOOMING ON TREND DATA While viewing trend data, press ZOOM to zoom in or out respectively on the data around the cursor. Each press reduces the x‐axis time period by one half in order to reveal more detail. Each press doubles the time period until all of the recorded data is displayed. The zoom level is displayed in the upper‐right hand corner of the display.
Extech Instruments METER INFORMATION SCREEN The meter INFO selection lists the serial number, model number, firmware version, calibration date, calibration counter, operator name, and company name. 1. Open the Setup menu by pressing the F4 key (SETUP). 2. Position the menu selector next to the menu item labeled INSTRUMENT and press OK 3. Position the menu selector next to the menu item labeled METER INFO and press OK, press the OK key again for meter information. SETTING THE EVENT THRESHOLD VALUE 1.
Extech Instruments CALIBRATION ACCESS The Calibration selection allows a qualified calibration technician to enter a password that grants access to the meter for calibration purposes. 1. Press the F4 key (SETUP) to access the Setup menu. 2. Using the cursor buttons, move the menu selector next to the item labeled Calibration and press OK. 3. Select menu item CALIBRATE and press OK. 4. Select CALIBRATE and press OK. 5.
Extech Instruments SETTING THE DATE AND TIME The meter’s internal clock is used for time‐stamping and for general informational purposes. To change the date and time, as well as the display format, press the F4 key (SETUP) and then follow the steps below: 1. Position the menu selector next to the item labeled DISPLAY and press OK. 2. Position the menu selector next to the item DATE/TIME and press the OK key. 3.
Extech Instruments TIME AND DATE FORMATS 1. Press the f4 key (SETUP). 2. Position the menu selector next to the item labeled DISPLAY and press OK. 3. Position the menu selector next to the item labeled FORMAT and press OK 4. Position the menu selector next to the item labeled TIME FORMAT or DATE FORMAT and press OK to begin editing 5. TIME FORMAT – select F1 (24 HOUR) or F2 (12 HOUR). DATE FORMAT – select F1(MM/DD/YY) or F2 (DD/MM/YY). Press F3 (CANCEL) to exit without changing the format.
Extech Instruments DIGITAL OSCILLOSCOPE INSTRUCTIONS MAIN OSCILLOSCOPE DISPLAY DESCRIPTION 1. Date and Time 2. Status of current waveform window 3. Remaining battery power 4. Waveform display area 5. Waveform peak value 6. Signal coupling marks, preset amplitude 7. Waveform’s measured frequency 8. Preset sample rate 9. Trigger mode mark 10. Fast display mark 11. Slow display mark 12. Operation prompt bar 39 GX900-GX930-EN V1.
Extech Instruments OSCILLOSCOPE FUNCTION TEST Perform a quick functional test to verify the operation of the oscilloscope. 1. Switch ON power 2. Connect the oscilloscope to a signal source. A 110/220V AC power source is a good place to start. 3. Press ‘AUTO’ and the corresponding frequency and peak waveform will be detected in a matter of seconds. 4. If using a 110/220V power source use the down arrow button to set the V/div. User the left/right arrows to set the number of samples per second.
Extech Instruments BATTERY AND FUSE REPLACEMENT BATTERY REPLACEMENT When the low battery icon appears on the display replace the batteries as described below: 1. Switch the meter off and remove the test leads from the meter’s input jacks 2. Open the battery compartment door by removing the 2 screws. 3. Replace the batteries; please observe battery orientation and polarity 4.
Extech Instruments SPECIFICATIONS GENERAL SPECIFICATIONS Enclosure Shock (Drop Test) Diode Test PEAK Temperature Sensor Input Impedance AC Response ACV Bandwidth Crest Factor Double molded, waterproof 6.5 feet (2 meters) Test current 0.9mA maximum, open circuit voltage 3.2V DC (typ.) Audible signal will sound if the resistance is less than 25 ohms (approx.), test current <0.
Extech Instruments ELECTRICAL SPECIFICATIONS Function DC Voltage Resolution 0.001mV 0.01mV 0.0001V 0.001V 0.01V 0.1V Range 50mV [¹] 500mV [¹] 5V 50V 500V 1000V Accuracy (0.05% + 20) (0.025% + 5digits) (0.025% + 5digits) (0.025% + 5digits) (0.05% + 5digits) (0.1% + 5) [1] Use the relative mode (REL Q) to compensate for offsets. Function Range Resolution AC Voltage 50mV 500mV 5V 50V 500V 1000V 0.001mV 0.01mV 0.0001V 0.001V 0.01V 0.1V Accuracy 50 to 10000Hz 50/60Hz(0.3% + 25) <1KHz(0.
Extech Instruments Function (AC+DC) Function Range Resolution 500µA 5000µA 50mA 500mA 10A Range 0.01µA 0.1µA 0.001mA 0.01mA 0.001A Resolution 50mV 500mV 5V 50V 0.001mV 0.01mV 0.0001V 0.001V Accuracy 0 to 1000Hz (1.0% + 25) (1.5% + 40) Accuracy 5K-100K AC Voltage (5000+ count) (5.0% + 40) (6.0% + 40) NOTE: Accuracy is stated at 18 to 28°C (65 to 83°F) and less than 75% RH. AC switch according to the calibration of sine wave.
Extech Instruments Function Frequency (electronic) Frequency (electrical) Function Duty Cycle 4-20mA% Function RPM Count Clamp(DC) Clamp(AC) Function Range Resolution Accuracy 50Hz 0.001Hz 500Hz 0.01Hz 5kHz 0.0001kHz 50kHz 0.001kHz ±(0.01% + 10) 500kHz 0.01kHz 5MHz 0.0001MHz 10MHz 0.001MHz Sensitivity: 2V RMS min. @ 20% to 80% duty cycle and <100kHz; 5V RMS min @ 20% to 80% duty cycle and >100kHz. 40.00-10kHz 0.01 - 0.001kHz ±(0.5% reading) Sensitivity: 2V RMS Range Resolution Accuracy ±(1.
Extech Instruments Warranty FLIR Systems, Inc. warrants this Extech Instruments brand device to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department for authorization. Visit the website www.extech.com for contact information.
Extech Instruments Garantie FLIR Systems, Inc. garantit que cet appareil Extech Instruments est exempt de défauts matériaux et de fabrication pendant un an à partir de la date d’envoi (une garantie limitée de six mois s’applique aux capteurs et aux câbles). Si le renvoi de l’appareil pour réparation devient nécessaire durant ou après la période de garantie, contactez le service client pour autorisation. Pour obtenir les coordonnées, visitez le site Web suivant : www.extech.com.
Extech Instruments Garantía FLIR Systems, Inc., garantiza este dispositivo marca Extech Instruments para estar libre de defectos en partes o mano de obra durante un año a partir de la fecha de embarque (se aplica una garantía limitada de seis meses para cables y sensores). Si fuera necesario regresar el instrumento para servicio durante o después del periodo de garantía, llame al Departamento de Servicio a Clientes para obtener autorización. Visite www.extech.com para Información de contacto.
