Measurement Computing Digital488/80A - Manual (Page 30)

Power-Up & Programming Tests
Power-Up Activation
CAUTION
Line Voltage: The protective conductor terminal on the AC line connector must be
connected to an external protective earthing system. Failure to make such a
connection will impair protection from shock.
LED Patterns for Error Conditions
LED Indicators
Condition
TALK LISTEN SRQ ERROR TEST POWER
Normal (No Errors) (Off) (Off) (Off) (Off) (Off) ON
ROM Error ON ON ON ON ON ON
RAM Error FLASHING FLASHING FLASHING FLASHING FLASHING ON
NV-RAM Checksum Error (Off) (Off) (Off) ON (Off) ON
No Power (Off) (Off) (Off) (Off) (Off) (Off)
With the power cord plugged in and connected to the Digital488/80A, turn on the unit by depressing the
rear-panel power switch. All of the front-panel LED indicators should light up for approximately one
second while the Digital488/80A performs an internal ROM and RAM self-check. At the end of this self-
check all of the LED indicators should turn off except for POWER.
Otherwise, the Digital488/80A may be in an error condition according to the one of the four following
LED patterns:
• If all of the LED indicators remain on: Then a ROM error has occurred.
• If the POWER LED indicator remains on while the rest of the LED indicators flash continuously:
Then a RAM error has occurred. Try cycling the power to the Digital488/80A to determine that the
error is repeatable.
• If the POWER and ERROR LED indicator remain on while the rest of the LED indicators are off:
Then a checksum error on Non-Volatile RAM occurred, and the saved configurations may be lost.
The checksum error condition may be cleared by doing a save of a configuration using the Save
Configuration (
S ) command.
Note: The error condition cannot be cleared by using the Query Error Status ( E? ) command.
• If all of the LED indicators are off: Then there may not be any power being supplied to the
Digital488/80A. In this event, check to make sure that the AC power cable is securely connected at
both ends. Otherwise, there may be a problem with the fuse. For more information, see section Power
Line & Fuse Configuration earlier in this chapter.
For convenience, you may want to program the Digital488/80A to power up with your configuration.
Refer to the Configuration (
C ) and Save Configuration ( S ) commands. Input or output status is set using
the Configuration ( C ) command. To save the input/output status as the new setting for the power-up
default, it must be saved as part of the Recall Configuration ( O ) command. To set the unit to a particular
configuration upon power on, the Save Configuration ( S ) command must be used once all the desired
options have been selected.
24 Digital488/80A Power & Assembly Digital488/80A User's Manual