UVCS Re-commissioning
| Date | Long Contact | Activity
Duration (hours) |
Detailed Schedule | |||
|---|---|---|---|---|---|---|
| Hours | Type | Activities | ||||
| Saturday
October 10, 1998 DOY 283 |
DSS-24 16:55-19:45 UT
DSS-16 20:00-01:45 UT |
8 | 0.5 | TSTOL | UVCS_ON | |
| 2 | TSTOL and
NRT-d |
UVCS_CHECK-OUT | ||||
| 5.5 | NRT-s | UVCS_CHECK-OUT | ||||
PHASE I Activities:
1. Verify reception of Medium and Low-Rate
telemetry
2. Flight Operations Team powers on UVCS
A side electronics
UVCS power on at 17:27 UT!
3. Verify that UVCS is in Initialization
Mode and that all
telemetry points are nominal
UVCS has been successfully powered on, current
is nominal, and all temperatures are reasonable as
of 18:05 UT!
4. Verify UVCS receipt of near real time
commands
Have verified that commands have been received
from UVCS EOF workstation!
5. Utilize operations software to verify
UVCS memory checksums
Memory checksum test has verified the integrity
of UVCS Flight Software!
6. Activate main UVCS flight software and
verify "Standby" mode
UVCS switched to "Standby" mode at 19:03 UT!
7. Flight Operations Team switches on UVCS
substitution heaters
in the telescope to compensate
for absence of detector and mechanism
power dissipation.
FOT has switched on substitution heaters at 20%!
8. Heater configuration and temperatures
are checked
Endcap heaters turned down to 25% power,
mirror/occulter mechanism heater turned to
100%, and visible light detector electronics heater
turned on to raise its temperature toward nominal
value!
This completes the Near Real Time (NRT) commanding
portion of Phase I!
9. Telemetry watched for at least 8 hours to
establish trends in
temperatures. Operational and Substitution Heaters are adjusted
as necessary to establish
safe steady instrument configuration.
FOLLOWING THE ABOVE ACTIVITIES UVCS SHOULD BE IN A STABLE
CONFIGURATION
THAT WILL ALLOW
FOR CAREFUL EVALUATION OF
HOUSE KEEPING DATA
TO BE FOLLOWED
BY RE-COMMISSIONING
OF MECHANISMS AND DETECTORS.
FOT has switched substitution heaters to telescope unit to 30%
Evaluation of housekeeping data has determined that all UVCS
instrument telemetry point values including instrument voltages,
currents, temperatures, and mechanism position sensors are within
their nominal ranges!
PHASE II Activities:
UVCS activities scheduled to begin at 19:05
UT on 11 October 1998 were delayed due
to unavailability of appropriate DSN support.
UVCS Phase II activities began at 21:00 UT
12 October 1998.
1. Verify that all temperatures are in nominal range
2. Verify or set arming plugs for flight operations
3. Check safety flags
4. Verify that launch locks are open
5. Install/check key tables
6. Partially open aperture Door
7. Initialize torque motor driven mechanisms
UVCS commanding resumed at 23:34 UT
12 October 1998
8. Switch on mechanism power
9. Re-commission polarizer mechanism
10. Re-commission mirror/occulter mechanism
11. Re-commission internal occulter mechanism
12. Re-commission O VI grating mechanism
UVCS commanding resumed at 17:54 UT
13 October 1998
13.
Re-commission Ly-alpha grating mechanism
Mechanism positions correctly; Grating stability slightly
out of specification; Data under review.
14.
Re-commission filter inserter mechanisms
15.
Re-commission O VI slit mechanism
16.
Re-commission Ly-alpha slit mechanism
17.
Re-commission Roll mechanism
18.
Re-commission Pointing mechanism
19.
Open UVCS Aperture Door
20.
Evaluate UVCS Shadow Sensor Readings
21.
Establish Alignment of UVCS Occulted Telescope to the Sun
Alignment at current roll orientation is confirmed
Alignment
at all roll orientations awaits spacecraft
roll
manuever on 16 October 1998
22.
Roll UVCS 57 degrees counter clockwise to center the field
of view on the East limb
23.
Power on O VI detector electronics (low voltage only)
24.
Verify O VI detector telemetry points
25.
Power on Ly-alpha detector electronics (low voltage only)
26.
Verify Ly-alpha detector telemetry points
27.
FOT to turn off substitution heaters
28.
Continue to monitor UVCS housekeeping data. Adjust temperatures
as required
All housekeeping telemetry points including temperatures
are nominal!
PHASE III Activities:
1.
O VI stimulus pulse test
2.
O VI detector background count rate measurement
with stimulus
pulse and full detector mask
3.
Insert O VI channel high neutral density filter
4.
Ramp up O VI detector high voltage
5.
O VI stimulus pulse and background exposures with
high voltage ramped up
Dark count rate is 3.1e-05 counts per second per pixel which is nominal
UVCS has taken its "re-commissioning
UVCS O VI Mirror Scan above the East Limb begun
O VI 1032 Angstroms
Dark count rate is 2.5e-05 counts per second per pixel which is nominal
UVCS has taken its Lyman Alpha "re-commissioning
This concludes this phase of UVCS re-commissioning!
6.
Take UV exposure with full O VI detector mask and filter disengaged
first light spectrum!"
UVCS commanding resumed at 20:12 UT
14 October 1998
7.
Load detector mask OVI_237_ANGb in slot 4
8.
Insert visible light detector neutral density filter
9.
Visible light detector background count rate measurement
10.
Disengage filter and take VL exposure
11.
Ly-alpha stimulus pulse test
12.
Upload observing program for O VI channel to run during the night
successfully at 03:53 UT
15 October 1998
1.50 - 2.60 Solar Radii
13.
Turn off mirror/occulter mechanism (MOM) heater
14.
Ly-alpha detector background count rate measurement
15.
Insert Ly-alpha channel high neutral density filter
16.
Ramp up Ly-alpha detector high voltage
17.
Ly-alpha background exposures with high voltage
ramped up
18.
Ramp down Ly-alpha detector voltage and disengage filter
19.
Ramp up Ly-alpha detector high voltage
20.
Take UV exposure with full Ly-alpha detector mask.
first light spectrum!"
21.
Put instrument in safe state in preparation for spacecraft manuvers
23.
360 degree roll and sun sensor check
24.
Load and start observing program for 18 October 1998
Now begin the preparations
for November's SPARTAN
flight!
Created by Raid Suleiman
Last Modified by Raid Suleiman on 10/09/98
Additional Modification by Rai Wu on 10/20/98