Check Mate CM-140 - Sound Level Meter Galaxy Audio - Free user manual and instructions
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| Product Type | Sound Level Meter |
| Brand | Galaxy Audio |
| Model | Check Mate CM-140 |
| Measurement Range | 30 to 130 dB |
| Frequency Weighting | A and C |
| Response Time | Fast (125 ms) and Slow (1 s) |
| Display | Backlit LCD |
| Functions | Max Hold, Data Hold, Auto Power Off |
| Power Supply | 9V Battery (6F22) |
| Battery Life | Approx. 30 hours |
| Dimensions | 220 x 70 x 35 mm |
| Weight | 200 g (with battery) |
| Accuracy | ±1.5 dB |
| Operating Temperature | 0°C to 40°C |
| Humidity Range | 10% to 90% RH (non-condensing) |
| Maintenance | Clean with dry cloth; store in dry, dust-free place |
| Safety | Do not expose to extreme temperatures or moisture; use protective case |
| Spare Parts | 9V battery, windscreen foam, carrying case |
| Repairability | Battery compartment accessible; calibration recommended annually |
Frequently Asked Questions - Check Mate CM-140 Galaxy Audio
How do I turn on the Check Mate CM-140?
Press the POWER button located on the left side of the meter. The display will light up. To turn off, press and hold the same button for 2 seconds.
How do I switch between A and C weighting?
Press the WEIGHTING button (labeled A/C) to toggle between A-weighting (dBA) for general noise and C-weighting (dBC) for peak measurements. The current setting is shown on the display.
What does the 'MAX HOLD' function do?
The MAX HOLD function captures and displays the highest sound level recorded. To activate, quickly press the MAX button; the display will show 'MAX' and update only if a new peak is detected.
How do I change the battery?
Slide the battery compartment cover down at the back of the meter. Remove the old 9V battery and insert a new one, observing polarity. Replace the cover. Use a 9V alkaline battery for best performance.
Why is the display showing 'OL' or 'UR'?
OL (Overload) indicates the sound level exceeds the meter's upper range (130 dB). UR (Under Range) means the level is below 30 dB. Move to a different location or adjust the measurement range if applicable.
Can I calibrate the CM-140 myself?
The CM-140 has a built-in calibration check using a 94 dB reference signal. Press and hold the CAL button for 3 seconds; the display should show 94.0 dB. If not, adjust the calibration screw with a small screwdriver.
What is the purpose of the windscreen?
The foam windscreen reduces wind noise and protects the microphone from dust and moisture. Always attach it when measuring outdoors or near air currents.
How do I use the data hold function?
Press the HOLD button to freeze the current reading on the display. The display will flash 'HOLD'. Press it again to release and continue measuring.
What does the automatic power-off do?
The meter automatically shuts off after 15 minutes of inactivity to save battery. To disable, hold the POWER button for 5 seconds while turning on; the auto-off symbol will disappear.
How do I clean and store the meter?
Wipe the exterior with a soft, dry cloth. Do not use solvents. Store in a dry, dust-free place at room temperature. Remove the battery if not used for long periods.
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USER MANUAL Check Mate CM-140 Galaxy Audio
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Product information
Brand : Galaxy Audio
Model : Check Mate CM-140
Category : Sound Level Meter