407790 Datasheet, PDF (15/18 Pages) Extech Instruments Corporation. – Real Time Octave Band Analyzer

Automatic Datalogging
First set the datalogging sampling rate (how often a reading is stored). When in the auto
datalogging mode, parameter editing is disabled.
1. Setting the sampling rate: The default value is “0” indicating that datalogging is disabled.
Press the 2nd button, then press the MEMORY button to select the sampling rate from
the following list: 0sec (No recording) 1sec 3sec 10sec 30sec 1min 5min
8min 10min 15min 30min 1hr 8h 62.5ms. For example: with the rate set to 1
second, the display will read: P [00:00:01].
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
2. Press the 2nd button, the 2ND annunciator will disappear from the screen.
3. Use the SLM/ 1/1/ 1/3 button to select the desired SLM, 1/1 or 1/3 octave band sound
pressure level measurement screen.
4. Use the MEAS TIME button to select the measurement time after which datalogging
automatically stops. There are 13 presets available:
• 1 second
• 3 seconds
• 10 seconds
• 30 seconds
• 1 minute
• 5 minutes
• 8 minutes
• 10 minutes
• 15 minutes
• 30 minutes
• 1 hour
• 8 hours
• 24 hours
Note: The list wraps around from 24h to 1s.
5. Press the MEMORY button to enter the memory mode; the upper portion of the LCD
will display “M [∗∗∗∗]”.
6. Press the START/STOP button, automatic datalogging will begin. The upper portion of
the screen will display “S Auto” and the “” annunciator.
NOTE: If the low battery icon is flashing on the display, the datalogger will not record data
accurately and the “S Auto” and “” annunciator may not switch on.
15
Model 407790 Ver. 2.1 9/07