Manual

Functional description
80 Two-channel digital Oscilloscopes
Functional description
VIII - UTILITY 2/4 (cont'd)
2. Test of keypad
Choose "Test keypad" to access the keypad test interface. The rectangles
represent the keys on the front panel. The seven rectangles flanked by
arrows represent the knobs on the front panel. The square below these
seven rectangles represents the switches built into these knobs. Test all of
the knobs and their switches. Also check that the backlit keys operate
correctly.
Note:
● At the start of the "keypad test" all of the keys are white on a black ground.
● The keys that are white have not been tested.
● The keys that have been tested are green.
● The bottom of the screen displays the message "Press 'RUN/STOP' Key
Three Times to exit" to indicate that the "RUN/STOP" key must be pressed
three times in a row to exit from the keypad test.
3. LED test
Select "Test LED" to access the key backlight LED test interface. The
message "Press 'SINGLE' key to continue, Press RUN/STOP Key to Exit" is
displayed. Press the "Single" key repeatedly to test, one by one, the
backlight LEDs. When a key is lit, the corresponding rectangle is coloured
green.