407738 Datasheet, PDF (3/8 Pages) Extech Instruments Corporation. – Digital Sound Level Meter

Meter Description
1. Microphone: Electret condenser
2. Microphone collar: unscrew to remove microphone
3. LCD Display
4. Push-buttons:
• Power button
• A,C buttons: Sets the frequency weighting
• FAST, SLOW buttons: Sets the response time
• MAX button: Selects MAX, MIN or current measurement; also used to test the
FAST/SLOW characteristics. Press and hold the MAX button for 5 seconds
(MAX will flash on the LCD); press again to exit. For specifics, refer to relevant
sections in this manual.
• MEM button: Press to store a data set in memory
• READ button: Press to read the stored data sets
• Up and Down Arrow buttons: Used to select measurement ranges; also used to
scroll through the stored data sets in the MEM (memory) mode.
5. CAL potentiometer: For calibration. Optional calibrator required.
6. External 9VDC power adaptor
7. DC/AC analog output: Retransmission of sound level measurement for chart recorder
or other datalogger
8. Tripod Mount
9. Battery compartment
1
2
3
4
With Memory
5
8
6
7
9
3
Model 407738 Version 2.2 September 2005