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6.4 Hardware Tests
The tests can be performed without external wiring, but DC power supply and AC voltage and
current source are required.
6.4.1 User Interfaces
This test ensures that the LCD, LEDs and keys function correctly.
LCD display
•
Apply the rated DC voltage and check that the LCD is off.
Note: If there is a failure, the LCD displays the "Auto-supervision" screen when the DC voltage is
applied.
• Press the
RESET
key for 1 second and check that black dots appear on the whole screen.
LED display
•
Apply the rated DC voltage and check that the "IN SERVICE" LED is lit in green.
• Press the
RESET
key for 1 second and check that seven LEDs under the "IN SERVICE"
LED and two LEDs for monitoring jacks A and B are lit in red.
VIEW and RESET keys
•
Press the
VIEW
key when the LCD is off and check that the "Metering" screen is displayed
on the LCD.
• Press the
RESET
key and check that the LCD turns off.
Keypad
•
Press any key on the keypad when the LCD is off and check that the LCD displays the
"MENU" screen. Press the
END
key to turn off the LCD.
• Repeat this for all keys.