Operation Buttons - Extech Instruments 400790A User Manual

2.2 Operation Buttons
START/STOP button
Press to start or stop for recording the sound pressure measurement.
PAUSE/CONT button
Press to temporarily pause ( ) a measurement) or resume () measurement.
M button
Press to scroll through and select different processing modes.
 LEVEL 
Press to select the level range for measurement. The following five settings are available.
20 to 90 dB, 20 to 100 dB, 20 to 110 dB, 30 to 120 dB, 40 to 130 dB.
GRP/ NUM button
Press to switch between graph and numeric display for Octave measurements.
SLM 1/1 1/3 button
Press to switch to select the sound level meter display and analysis screen.
(SLM, 1/1, 1/3, 1/1&1/3)
MENU
Press to enter menu screen to setup various menu parameters. Press again to close the
menu.
R button
Start or stop the auto Record process or press to manually store the measurement data into
memory.
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