Extech Instruments 400790A User Manual page 31

If the indication "UN" is shown, the processed data include data where the sound level signal
caused an under‐range condition.
13. Press the M button to cycle through the Lp  Leq  L
Lmin  L05  L10  L50  L90  L95 measured value on the screen.
Pressing the GRP/NUM button switches the measurement screen between graph and numeric
display.
In graph display, use the  and  buttons to move the cursor to the desired frequency band.
In the 1/1 & 1/3 OCT numeric display, frequencies that are not displayed can be called up with
the  and  buttons.
The PAUSE/CONT button can be used to stop and resume the updating of band level indication. In
the pause condition, a pause symbol ( ) appears on the display. (The pause interval is not
included in the measurement time.)
During measurement, you can use the MODE key to check the measured values as currently
calculated.
(SEL)  Lmax 
E
31
407790A-en-US_v2.0 8/16