Extech Instruments 407735 User Manual
User's Guide
Digital Sound Level Meter
Model 407735
Introduction
Congratulations on your purchase of the Extech Model 407735 Digital Sound Level Meter.
This professional meter, with proper care, will provide years of safe reliable service.
407735 Ver. 2.1 04/2006
2
Specifications
Display 3-1/2 digit (2000 count) LCD
Display update rate 0.5 seconds
Microphone 0.5” Electret condensor
Measurement Bandwidth 31.5Hz to 8KHz
Dynamic range 65dB
Measurement Range 35 to 130dB (Low: 35 to 90; High: 65 to 130dB)
Frequency weighting ‘A’ and ‘C’ (selectable)
Accuracy / Resolution ± 2.0dB @1kHz / 0.1dB
Maximum Hold decay time <1dB / 3min
Response time Fast: 125 milliseconds / Slow: 1 second
Built-in calibration check 1KHz internal sine wave @ 94dB
AC Analog output
0.65VAC rms (full scale); 600Ω output impedance
DC Analog output
10mVDC / dB; 100Ω output impedance (approx).
Power 9V Battery
Battery life 50 hours (typical); Low battery indicator alerts user
Operating temperature 32 to 104oF (0 to 40oC)
Operating humidity 10 to 90% RH
Dimensions/weight 9.45 x 2.68 x 1” (240 x 68 x 25mm) / 6.75oz (210g)
Meter Description
1. Microphone
2. LCD display
3. POWER OFF & RANGE select switch
4. RESPONSE & HOLD select switch
5. A/C weighting and Calibration switch
6. Calibration adjust screw for 94dB
7. Reset key (resets max hold reading)
8. AC/DC analog output 3.5mm phone jack
9. Battery compartment and Tripod mount are located
on back of meter
Measurement Considerations
1. Wind blowing across the microphone adds extraneous noise to the measurement.
Use the supplied windscreen to cover the microphone when applicable.
2. Calibrate the instrument before each use if possible. Especially if the meter has not
been used for a long period of time.
3. Do not store or operate the instrument in areas of high temperature or humidity.
4. Keep meter and microphone dry.
5. Avoid severe vibration when using the meter.
6. Remove the battery when the meter is to be stored for long periods of time.
Loading...