407790 Datasheet, PDF (5/18 Pages) Extech Instruments Corporation. – Real Time Octave Band Analyzer

Operation Buttons
Refer to the diagram on the next page for the following button descriptions.
MODE button
Press to display the following: Sound pressure level (L), equivalent continuous sound
pressure level (Leq), Sound exposure level (LE), maximum sound pressure level
(Lmax), and minimum sound pressure level (Lmin).
FREQ WGHT button
Selects the frequency weighting. “A” weighting (A), “C” weighting (C), and flat
frequency response (P).
TIME CONST button
Selects the response time “FAST” and “SLOW”.
LEVEL
Press to select the sound pressure level ranges in 1/1 and 1/3 octave band frequency
analysis mode. (20~90dB, 30~100dB, 40~110dB, 50~120dB and 60~130dB)
SLM/ 1/1/ 1/3 button
Press to select the operation mode: Sound level meter (SLM), 1/1-octave frequency
analysis (1/1), and 1/3-octave frequency analysis (1/3).
MEAS TIME button
Sets the Leq, L_E, Lmax and Lmin measurement time :
24h 1s 3s 10s 30s 1m 5m 8m 10m 15m
30m 1h 8h
2nd + MEAS TIME : Enter to setting the date and time mode.
MEMORY button
Enter to memory mode.
2nd + MEMORY : Enter to data record interval time setting : 0 (no record)
1s 3s 10s 30s 1m 5m 8m 10m 15m 30m 1h 62.5ms
ENTER button
Stores the new date and time (also starts the real-time calendar clock)
Cursor button
Press to move the octave frequency band marker during frequency analysis.
2nd+ Cursor : Use in recall mode to select the memory address in which to
store the measurement data.
START/STOP button
Press to start or stop the Leq, LE, Lmax and Lmin sound pressure level
measurement.
PAUSE/CONT button
Press to temporarily pause ( display) or resume (display )
2nd button: Press to change the buttons to their secondary functions.
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Model 407790 Ver. 2.1 9/07