• set of darks 12 minutes apart for two hours
• 1700, WL and 1216 flats

We can move the filterwheels to an unused back AL filter by issuing the following commands in the timeline about 30 minutes before the annealing is to start

START TDT.any_frames PRIOR=0
CMD ICSQREG (REG=16, VAL=8)
CMD ICSQREG (REG=17, VAL=100)
CMD ICSQREG (REG=26, VAL=179)
CMD ICSQREG (REG=18, VAL=9128)

FOT should verify that AP 27 is ACTIVE and AP 28 is DISABLED. AP 27 calls RTS43 and RTS33 to shut off the decontam heaters and activates AP 28. AP 28 would call RTS 44 and 32 to disable all instrument operational heaters if temps continue to be above 45 C

In pass

Verify that the sequence is stopped,

Verify that Filterwheel 1 is correct

Verify that Filterwheel 2 is correct

Turn on the CCD Decontam Heater to level 1:
; Expect decontam heater current PSDECHTRCURR to go to ~0.34 Amps

For the rest of the pass, expect to see the CCD temperatures IOCCDLOT and IOCCDHIT to be increasing

At next pass
Check IOCCDHIT. If less than 10 degrees C, turn up the decontam heater to level 2:

; Expect decontam heater current PSDECHTRCURR to go to ~0.45 Amps
If temperature is more than 10 and less than 40 degrees C, do nothing

If temperature is more than 40 (this is very unlikely), turn off the decontam heater:
; Expect decontam heater current PSDECHTRCURR to go to < 0.08 Amps

Monitor for next 2 days. The CCD Op heater can be turned on and set to reach a desired temperature by choosing the lower and upper deadbands. As an example, the following commands on 14 April, 1998, set the temperature to 27 +/-1 degree C:

; Expect Op heater current PSINOPHTRCUR to increase by ~0.36 Amps above its previous readings; since other Op heaters are enabled and cycling on and off, the current has been varying from about 0.06 to 1.2 amps recently

To turn off Operational Heater and Decontamination heater

Turn decontamination heater to 1 first
; Expect decontam heater current PSDECHTRCURR to go to ~ 0.34 Amps

Turn it off at next pass
; Expect decontam heater current PSDECHTRCURR to go to < 0.08 Amps

For the rest of the pass, expect to see the CCD temperatures IOCCDLOT and IOCCDHIT to be decreasing. They should go back to normal operating temperatures (-55 +/-6 degrees and -40 +/- 2 degrees, respectively) within 3-4 hours.

NASA Security Statement