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Temperature Control
After a power failure . . .
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ACTUAL SETPOINT
FAULT: OVEN > MAX+20
ACTUAL SETPOINT
FAULT: OVEN TEMP RDG
ACTUAL SETPOINT
FAULT: DETA TEMP RDG
ACTUAL SETPOINT
FAULT: INJA TEMP RDG
ACTUAL SETPOINT
FAULT: LINE SENSE
ACTUAL SETPOINT
FAULT: ADC OFFSET
Thermal Control FAULT: Messages
Figure 3-7
In addition to the message, the red NOT READY LED blinks. All zones
and the oven are turned off and made inoperative until power is switched
off, and then on again (setpoints are maintained).
After a power failure . . .
Setpoint values are protected during a power failure (even if intentional,
by disconnecting the power cord, or by switching off the HP 5890 at its
main power switch) by a lithium battery (10•yearnominal life) which
maintains power to HP 5890 memory.
After power is restored, a message is displayed, as shown in Figure 3•8.