Power-up & performance tests, Power-up activation, Caution – Measurement Computing DAC488 v.1 User Manual
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18 DAC488 Power & Assembly
DAC488 User’s Manual
Power-Up & Performance Tests
Power-Up Activation
CAUTION
CAUTION
CAUTION
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 DAC488, 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
DAC488 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 DAC488 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 DAC488 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 System Defaults
(
S
) command. The error condition may also 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 DAC488.
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.