33-2055 User’s Guide Digital Sound Level Meter Thank you for purchasing your Digital Sound Level Meter from RadioShack. Please read this user’s guide before installing, setting up, and using your new meter.
Setup Package contents • Digital Sound Level Meter • Carry Case • User’s Guide • Quick Start Features • For home/hobbyist use: fine tune your stereo, PA system, or home theater • Attaches to a tripod with ¼ inch connector • Selectable weighting for noise level or musical sound • Displays average or maximum sound level • Integrated averaging from 1 to 199 seconds 1 Install battery Your meter requires one 9V battery (not included) for power.
Microphone RANGE Switch OUTPUT Jack DH / RESET / MIN / MAX WEIGHTING / RESPONSE Tripod Adapter 3
• If you do not plan to use your meter for a long period, remove the battery. Batteries can leak chemicals that may damage electronic parts. 2 Mount and connect the meter (Optional) 1. Mount the meter on a (¼–inch) tripod to eliminate hand noise and minimize the effects of sound reflected from your body. This makes it easy to use the meter with auxiliary recording or test equipment. 2. Use an audio patch cord (not included) to connect the OUTPUT Jack to your stereo system or test equipment.
Setting the Meter Setting the Weighting Press WEIGHTING to select A or C. Weighting determines the meter’s frequency response curve. A-weighting has A-curve frequency characteristics and causes the meter to respond mainly to frequencies ranging from 500 to 10,000 Hz. This is the human ear’s most sensitive range. Select A to determine the noise level of an area. C-weighting has C-curve (flat) frequency characteristics and causes the meter to respond mainly to frequencies ranging from 32 to 10,000 Hz.
Understanding Indications Level Indicator The meter displays sound level using a number and a bar graph. The number shows the sound level in dB within ±10 dB of the selected range and is updated once a second. The bar graph’s center point represents the midpoint of the selected range, for example, for Range 70, the center point represents 70 dB. The bar graph updates every 0.2 seconds or 0.5 seconds.
and the bar graph disappears. If this happens, try the next lower range. n Notes: • The overrange or underrange indicator can also appear when you recall a reading using the measurement holding function and the measurement is under or over the selected range. • The meter can measure sound levels only from 50 to 126 dB. Taking Measurements Continuous Average Measurements Follow these steps to measure the average sound level. 1. Set RANGE to the desired range setting.
2. Set the weighting and response (see “Setting the Weighting” and “Setting the Response Time” on Page 5). 3. Point the meter’s microphone at the sound source. The meter displays the continuous average sound level during a one-second sampling period and updates the number on the display once a second. 4. After the measurement, set RANGE to OFF. Taking Maximum Measurements 1. Follow Steps 1-3 in “Continuous Average Measurements”. 2. Press MAX; the word MAX appears.
1. Press and hold DH for about 2 seconds during a continuous average or maximum measurement. The digit 1 appears. 2. Press (or press and hold) MAX or MIN to set a period from 1 to 199 seconds; position the meter for the measurement. 3. Press RESET to start the monitoring. The meter updates the current integrated average display once a second. MIN and MAX flash until the set time is up. When the set time is up, DH appears, and MIN and MAX go on flashing.
Taking Maximum and Minimum Measurements during an Undetermined Time Period 1. Press RESET during a continuous average or maximum measurement. At the end of the desired time period, press DH. DH displays. 2. Press MAX and MIN respectively to check the average, maximum (MAX stops flashing), and minimum (MIN stops flashing) sound levels during the time period. 3. Press RESET to resume a continuous average or maximum measurement.
1. Press DH during a continuous average or maximum measurement. DH displays and the last average or maximum measurement is frozen. 2. For an average measurement, what is frozen is the last average reading. Press MAX to check the last maximum measurement. MAX displays. Press MAX again to return to the average measurement. For a maximum measurement, what is frozen is the last maximum reading. 3. Press MIN to check the last minimum measurement. MIN displays.
Specifications Battery................................................................................... 9V Alkaline Microphone............................................................. Electret Condenser Range...................................................................................50 to 126 dB Accuracy................................................................ ±2 dB at 114 dB SPL Reference......................................................... 0dB = 0.0002 Micro Bar Weighting..........
Limited Warranty RadioShack warrants this product against defects in materials and workmanship under normal use by the original purchaser for ninety (90) days after the date of purchase from a RadioShack-owned store or an authorized RadioShack franchisee or dealer. RADIOSHACK MAKES NO OTHER EXPRESS WARRANTIES.
PRODUCT OR ANY OTHER PERSON OR ENTITY WITH RESPECT TO ANY LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE OR PERFORMANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WARRANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVENIENCE AND ANY LOSS OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT AND ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN IF RADIOSHACK HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
