Extech Instruments 407790A User Manual page 11

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7.
8.
9. Bar graph: Displays the sound level as a bar graph. (The display is updated every 100ms)
10.
LEVEL button.
11. Under-range indication: When a signal is under-range the
screen. Use the LEVEL
12. Overload indication: When a signal overload is detected, the screen will display
least 1 second. Use the
13.
14.
15. Main channel level display: Displays the measured sound level in the main channel.
(The display is updated every second).
16. Sub channel frequency weighting: Indicates the sub channel frequency weighting
characteristic. A: A-weighting, C: C-weighting, Z: Z-weighting (Flat response).
The sub channel frequency weighting can be set from the menu screen.
17. Sub channel time weighting:
18. Sub channel level display: Shows the measured sound level in the sub channel.
(The display is updated every second)
19. Power status: When operating the meter on battery power the yellow segments will
decrease as the battery power drains. When the segment starts to flash, replace batteries.
20. Manual store full: When the manual stored memory is full, the MFul symbol is displayed.
The manual data store capacity is 250 sets.
21. Auto store full: When the auto store memory is full, the AFul symbol is displayed. The auto
store capacity is 250 blocks.
22. Comparator ON: When the comparator function has been set to ON and a signal exceeds
the comparator output jack, the indicator Cmp will appear on the display. A signal will
output from the comparator output jack on the side panel (open collector).
23. Current date: Displays the current date
24. Current time: Displays the current time
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button to decrease the level range setting. If processed data is
LEVEL button to increase the level range setting. If processed
(10ms), I: Impulse (35ms)
(10ms), I: Impulse (35ms)
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UN symbol will appear on the
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