407780 Datasheet, PDF (3/13 Pages) Extech Instruments Corporation. – Integrating Sound Level Datalogger

Refer to the diagram on the facing page:
1. 1/2-inch microphone (shown with windscreen)
2. LCD display
3. Power Switch
4. Leq / SEL / SPL select switch
5. RUN / Pause switch
6. Use the UP/DOWN arrow keys to change the measurement preset time.
7. A / C Frequency weighting select switch
8. FAST / SLOW / IMPULSE time weighting select switch.
FAST: 125ms
SLOW: 1 second
IMPULSE: 35ms with slow decay
9. Press to select MAX MIN recording. Press again to step through MAX and MIN values.
Press and hold for 3 seconds to erase the MAX and MIN values and exit this mode.
10. RECORD / ERASE
Record standby: The RECORD symbol appears in standby mode.
Recording: The RECORD symbol flashes once per second while recording.
Erase data: Press & hold the RECORD/ERASE key for 3 seconds to erase data (the
entire LCD will flash three times).
11. Real time clock with calendar
12. Measuring time selection for Leq and SEL
13. RS-232 interface connector (Located on bottom, not shown)
14. AC output terminal (located on side, not shown)
2 Vrms at 130dB
Output impedance 600Ω Max.
Output signal uses standard 3.5mm phono jack (supplied). Signal on tip; ground on
sleeve.
15. DC output terminal (located on side, not shown)
Output: 10mV/dB
Output impedance 100Ω max.
Output signal uses standard 3.5mm phono jack (supplied). Signal on tip and ground on
sleeve.
16. CAL (calibration) potentiometer (located on side, not shown)
17. External DC 6V power supply terminal (located on side, not shown)
18. Tripod mounting screw (located on rear, not shown)
19. Battery cover (located on rear, not shown)
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Model 407780 Version 2.1 09/07