Extech Instruments 407790A, User Manual

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407790A-EN_V2.4 1/20
8. Press the

button to exit the measurement time setting.
9. Press MENU button to return to the measurement screen.
10. Press the START/STOP button to start the measurement. Previously measured values will be
cleared. While the measurement is in progress, the

symbol will flash and the elapsed
time will display on the screen. When the measurement time has elapsed, the
measurement is terminated automatically.
To terminate the measurement before the allocated time, press the START/STOP button.
If signal overload or an under-range occurs at least once during the measurement, the “OV” or
“UN” symbols will appear on the screen. This will indicate that overload or under-range
data are comprised in the processed values.
During measurement, the PAUSE/CONT key can be used to paused and resume the
measurement. During pause, the pause ( ) symbol is shown. (The paused interval is not
included in the measurement time.)
Important: During measurement, the

LEVEL

button, FREQ WEIGHT TIME button, TIME
WEIGHT and SLM/RTA function are disabled. Be sure to complete all settings before
starting the measurement.
11. When the measurement is completed, the

symbol will disappear.
The main channel and sub channel measured values of the Leq, SEL (L
E
), Lmax, Lmin, L05, L10,
L50, L90 and L95 are displayed.
If the indicator “OV” is shown, the processed data includes data where the sound level signal
caused an overload condition.
If the indication “UN” is shown, the processed data includes data where the sound level signal
caused an under-range condition.
The bar graph only shows the sound level value.