407790 Datasheet, PDF (10/18 Pages) Extech Instruments Corporation. – Real Time Octave Band Analyzer

Instantaneous sound pressure level measurement (L_A, L_C, L_P)
To perform a measurement, carry out the following steps.
1. Set the power switch to ON and wait until the measurement screen appears.
ID No: 00001358
Ver: 0.10
SOUND LEVEL METER
1/1 & 1/3 Octave Band
Real-Time Analyzer
FAST
LA
30
80
dB
130
Self-Testing...
[ SLM ] 01 / 07 / 27 14:26:39
2. Press the SLM/ 1/1/ 1/3 button to select the desired SLM, 1/1 or 1/3 octave band
sound pressure level measurement screen.
FAST LA
dB
100
W
75.2 dB
90
80
70
60
50
40
30
Hz 31.5 125 500 2k
8k L W
[ 1 / 1 OCT ] 01 / 07 / 27 14:26:39
FAST LA
dB
100
90
80
70
60
50
40
30
Hz 31.5 125
[ 1 / 3 OCT ]
W
500 2k
01 / 07/ 27
75.2 dB
8k L W
14:26:39
3. Use the FREQ WGHT button to select the desired LA , LC or LP frequency weighting
setting.
4. Use the TIME CONST button to select the desired FAST or SLOW time constant
setting. Normally, the “FAST” setting should be used.
5. Use the LEVEL button to select the range. Choose a setting in which the “OVER”
and “UNDER” indications do not appear. In SLM mode, the dynamic range is
30~130dB so the LEVEL button is not used.
10
Model 407790 Ver. 2.1 9/07