Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/hst/nicmos/documents/isrs/isr2000_006.pdf Дата изменения: Tue Mar 19 23:21:10 2002 Дата индексирования: Sun Dec 23 02:08:53 2007 Кодировка: Поисковые слова: lightning

NCC/NICMOS SPARE-DETECTOR EMI TEST

1

RESULTS FROM THE NCC/NICMOS SPARE-DETECTOR JUNE 2000 EMI TEST A report to NASA/GSFC and STScI Glenn Schneider (gschneider@as.arizona.edu) Steward Observatory University of Arizona 12 August 2000 0. SUMMARY Analysis of power spectra and images obtained with a NICMOS-3 flight spare detector, operated in conjunction with the NICMOS Cryo-Cooler (NCC) and mated with flight-like ground connections, indicate the total absence of any NCC induced electromagnetic interference in any of the more than 3000 NICMOS science data readouts (64K pixel) images examined. As a differential experiment, making use of the independently measured time-correlated samples provided by each of the four detector quadrants, the system sensitivities to detect EMI induced periodic and quasi-periodic signals in the frequency range from 5 Hz to 50 Khz closely reached, or exceeded, the per-pixel sensitivities of the NICMOS flight detectors in the flight instrument. A similar experiment performed in May, 1998, before the NCC test on the HOST mission, revealed the presence of complex broad-band signals impressed in the NICMOS science data readouts manifesting themselves as temporally varying "herringbone" patterns in the images with strong power components in the ~ 5-9 Khz region. The June 2000 test was conducted over a period of two days with NICMOS data collected with the NCC in an "off" state, and while being operated at a variety of compressor speeds from 5000 to 7200 rps. While significant non-NCC induced 60/180Hz contamination at the 10 DN (50 electron) peak-to-peak level was prevalent, and much smaller amplitude monochromatic signals were seen at higher frequencies, these were both unquestionably due to other sources. Frames taken with the NCC on and off were indistinguishable. It is apparent that changes in the NCC design and their implementation since its pre-HOST incarnation have succeeded in producing a unit which produces no measurable levels of induced signals in NICMOS science data readouts and is fully compatible with the use of NICMOS detectors onorbit thereby alleviating previous EMI concerns. 1. INTRODUCTION On June 27-28, 2000, as part of the NICMOS cryo-cooler testing program, the UofA NICMOS Project (see Appendix A) in concert with GSFC and STScI conducted an experiment to ascertain the possible susceptibility of a NICMOS-3 detector to conducted and/or radiated electromagnetic interference from the NICMOS cryo-cooler. A flight-spare detector (#97T0012) on a flight mount in a UofA test dewar (HDL-8 from IR Labs), was shipped to GSFC for this investigation. All control, signal, data, and power connections were made between the test dewar and a functional replica of the NICMOS flight electronics (a "Baseline Release Zero, or BRZ rack) in an electrically flight-like configuration. Grounding and mechanical connections to the test dewar and the cryocooler system were also established (by Creare, GSFC and UofA personnel) to emulate flight-like conditions. Conductance measures at the ground points were made at the start of each test day after (re)-integrating the dewar with the NCC and are given in Table 1.1.
Table 1.1 Ground Connection Conductances (resistivities in milliOhms) DAY 179 2.4 3.5 3.0 3.4 DAY 180 2.3 3.6 2.3 2.6 August 15, 2000

Cooler Cooler Dewar Cooler

to to to to

Ground-Strap Dewar Ground-Strap Wall

Glenn Schneider, Steward Observatory, UofA


NCC/NICMOS SPARE-DETECTOR EMI TEST

2

The mechanical configuration of the NCC and test dewar are shown in a series of photographs which may be downloaded from a NICMOS/UofA server at the URL:
http://nicmosis.as.arizona.edu:8000/NCC_EMI_2000/EMI_JPG/NCC_EMI_PHOTOS.html

Testing was carried out in an EMI clean/screen room at GSFC to attenuate outside interference. A series of images were obtained to map the spectral frequencies of any NCC induced EMI in NICMOS science data. Data were obtained using in-flight detector timing and clocking patterns as per normal on-orbit operations via stored command loads executing on a SITS system. 2. SAMPLING STRATEGY USING NICMOS-3 DETECTOR AND NICMOS FSW The primary sampling strategy employed multiple 3-repeat sets of 25-read 1.2-second delta-time mutltiaccum exposures, and was identical to that used in the April 1998 test. The reader is referred to the test report "EMI Noise Properties of the NICMOS Cooling System as Seen by a NICMOS3 Flight Spare Detector" (G. Schneider, UofA, 1 May 1998) for both background and more detailed information. In addition, two other multiaccum timing patterns were used at the request of STScI. The first employed asynchronous delta-times between reads, and the second a standard STEP64 readout pattern commonly used on-orbit. In this report, other than a first quick-look at the asynchronouly sampled data, we discuss only the results derived from the 26-read 1.2-second deltatime multiaccums. 3. DATA COLLECTION, FORMAT and DISTRIBUTION The NICMOS spare detector data, obtained with the GSFC VEST/BRZ system in the EMI test environment and which were the basis of this report, were delivered to STScI for independent verification of our findings. Those data, originally processed through the SI C&DH/SDF model in the SITS system were acquired as POD (.SDI) files and converted to FITS format with GENCONVERT (a rough analog to a subset of the generic conversion routines running in the OPUS environment). Those files were reformatted in post-processing to conform to the multiple science extension "multiaccum" format used for NICMOS science data delivered to observers by STScI and archived in the HDA, though we have written only science (SCI) extensions. In compliance with the multiaccum data file format defined by STScI, the science extensions are written in inverse time order, so that read 0 (the first readout after completing the detector reset cycle, also called the bias read) is the last science extension in the file. The data are treated as "raw", and hence uncalibrated, and are written as signed 16-bit integers. Each science extension is documented with FITS header keyword/value pairs which capture the exposure and readout information (in the EXPOSURE INFORMATION and READOUT PARAMETERS sections) of particular necessity to this test. Engineering telemetry capturing the state of the NCC was collected during the test through its GSE, sampling each of its operating parameters once every four seconds. The LABVIEW files generated by this system were delivered to UofA from Creare. Each GSE telemetry record was timecorrelated with the SITS science data files. For each science data readout, the 70 NCC telemetry items captured at the time closest to the end of the science data readout and were formatted and attached as keyword/value pairs in the science extension headers of the multiaccum FITS files. The NCC keywords were simply named NC0 - NC69, and carry brief descriptors identifying each value in the headers. Table 3.1 is an extract from a FITS header listing all NCC keyword entries with representative values. Of particular interest to this test are items NCS14 (compressor inverter frequency, Hz), NCS16 (compressor rotation speed, rps), NCS18 (turbo alternator speed, rps), and NCS19 (compressor motor current). Note that the compressor rotation speed will not be valid when the compressor motor is off. When the compressor motor is on NCS19 will have values 14 amps (higher at greater speeds), and close to zero when it is off.

Glenn Schneider, Steward Observatory, UofA

August 15, 2000


NCC/NICMOS SPARE-DETECTOR EMI TEST

3

Table
NCS0 NCS1 NCS2 NCS3 NCS4 NCS5 NCS6 NCS7 NCS8 NCS9 NCS10 NCS11 NCS12 NCS13 NCS14 NCS15 NCS16 NCS17 NCS18 NCS19 NCS20 NCS21 NCS22 NCS23 NCS24 NCS25 NCS26 NCS27 NCS28 NCS29 NCS30 NCS31 NCS32 NCS33 NCS34 NCS35 NCS36 NCS37 NCS38 NCS39 NCS40 NCS41 NCS42 NCS43 NCS44 NCS45 NCS46 NCS47 NCS48 NCS49 NCS50 NCS51 NCS52 NCS53 NCS54 NCS55 NCS56 NCS57 NCS58 NCS59 NCS60 NCS61 NCS62 NCS63 NCS64 NCS65 NCS66 NCS67 NCS68 NCS69

3.1.

NCC/GSE

Telemetry
/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /

Keywords/Values

in

FITS

Headers

= 'old format' = 26.915 = 5.708 = 0.012 = -0.002 = 4.823 = -0.001 = 4.907 = 4.869 = 6.619 = -0.001 = 8.241 = -0. = 15.165 = 6503.591 = -0.124 = 6367.016 = 11.69 = 3727.254 = 19.522 = -0.003 = 0.617 = 4.805 = 7.788 = -0.004 = 0.008 = 0.005 = 4.984 = 308.5 = 303.4 = 301.3 = 301.3 = 305.5 = 29.02 = 33.99 = 28.1 = 24.16 = 24.44 = 25.1 = 24.83 = 26.72 = 27.98 = 23.96 = 24.08 = 23.93 = 34.173 = 50.649 = 3.779 = 0.043 = 9.428 = 9.538 = 32.25 = 5.495 = -0. = -0. = -0.161 = 308.5 = 301.9 = 301.6 = 301.5 = 303.7 = 0.019 = 26.731 = 25.305 = 11.029 = 0.991 = 8.111 = 167.25 = 'Tue, Jun 27, 2000' = '4:04:05 PM'

format Bus Monitor (Volt x 7.97) 5.3 VDC Standby II (Volt) Comp. Spd. Lim O/R Ena.(Volt) Comp. Spd. Lim O/R Dis.(Volt) Comp. On/off Cmd.(Volt) Circ. On/off Cmd (Volt) Load Hi/lo Cmd (Volt) Freq.Limit O/R Status(Volt) Comp. Motor Current Cmd (Volt x 2.95) Circ. Invrt. Volt Cmd (Volt x 1.5223 - 0.1223) Comp. Invtr. Freq. Cmd. (Volt x 796) Circ. Invrt. Freq. Cmd.(Volt x 200) Analog Sel. Control (Volt) Comp. Invt. Freq. (Volt x 711.7 -75.9) Circ. Invt. Freq. (Volt x 200) Comp. Rotat. Speed (Volt x 800) Circ. Rotat. Speed (Volt x 201) Turbo Alt. Speed (Volt x 520.45 ) Comp. Motor. Current (Volt x 2.85 - 0.0456) Circ. Invrt. Current (Volt x 0.152 -0.009) Circ. Invrt. Volt (Volt x 1.502) TA Load Volt (Volt x 1.01) PCE Current (Volt x 6.0) Freq. Limit Det. Status (Volt) TA Load Hi/Lo Status (Volt) Comp. On/Off Status (Volt) Circ. On/Off Status (Volt) Load Interface T2(PRT) (TS04) NICMOS Out T7(PRT) NICMOS In T3(PRT) T/A Housing T6(PRT) Circ Hsg T5(PRT) (TQ32) Comp. Base Plate (2.2K Therm) Comp. Housing (2.2K Therm) Comp. Inlet (2.2K Therm) Neon Fill Bottle (2.2K Therm) Neon Refill Bottle (2.2K Therm) Neon Cap. Line (2.2K Therm Supply Valve (2.2K Therm) Heat Rejection (2.2K Therm) After Cooler (2.2K Therm) Solenoid Valve 1 (2.2K Therm) Solenoid Valve 2 (2.2K Therm) Manual Valve (2.2K Therm) Comp. Inlet Prs. (Volt. x 15.027 + 0.3306) Comp. Out Prs. (Volt. x 20.085 + 0.4001) Circ. Inlet Prs. (Volt. x 60.013 + 0.7451) Circ. Diff. Prs. ((Volt. + * 1.998) +0.1142) Fill Bottle Prs. (Volt. x 59.992 + 0.5910) Refill Bottle Prs. (Volt. x 59.945 + 0.5015) PCE Temperature (2.2K Therm) Power Status (Volt) Survival Htr A Status (Volt) Survival Htr B Status (Volt) Total Comp. Current (Volt x 6) Load Interface T2A(PRT) (TS29) TA Inlet T8(PRT) NICMOS In T3A(PRT) T/A Inlet T8A(PRT) NICMOS Out T7A(PRT) (TS26) Power Supply (Volt) Bus volt. @ Sorenson Bus volt. @ EMI filter Bus Current Shunt (Volt x 1000) TA Load Current (Volt x .200) Comp. Invrt Input Current Comp. Invrt Out Power (Volt x 52.1 + 8.0) Date Time

The "final" post-processed data files have been organized into directories corresponding to individual test segments (See section 4) and have been delivered to STScI on a set of four CD ROMS. Two CD ROMS contain data derived from test day 179, and two from test day 180. The data files on the "RAW" CD ROMS contain subdirectories named FITSxx{_x} which correspond to particular test segments which are described in Section 4. The "raw" files contained in these directories are the individual detector reads as simple FITS files before they were combined into the STScI multiaccum data format. The "root" file names contain the timetag of the transfer of the
Glenn Schneider, Steward Observatory, UofA August 15, 2000


NCC/NICMOS SPARE-DETECTOR EMI TEST

4

science data through the SDF and uniquely identify the readout through a post-fixed incremental counter. The data files on the EMI00179 and EMI00180 CDROMS may be of more immediate utility. The directories with the same names as on the RAW CD ROMs contain files which are in the STScI multiaccum format, and are identified by directory and root file name in the same manner. In each FITSxx{_x} subdirectory is a LOG file which identifies for each science extension how the image data was correlated with the NCC telemetry in the Labview data files (for example see a sample log file extract in Table 3.2). The EMI00179 and EMI00180 CD ROMS also contain the NCC GSE telemetry in the LABVIEW subdirectories, in three formats. Files without any name extensions are in the original LABVIEW format delivered by Creare. Files of the same names with a .OUT extensions are tab delimited with records delimited by new-line characters so they are immediately amenable to be imported into spreadsheet programs such as Excel. Files with a .FITS extension are the same data written as FITS binary tables. Each of these files has headers of the appropriate format to identify the data fields (and corresponds to the FITS header keywords written onto the science data files). Finally, we provide sets of "reference darks" made by median combining corresponding reads of multiple NCC OFF frames taken at a number of epochs during the test. These are the darks which were used in the analysis of the test data described elsewhere in this report. We provide them as a convenience for others who may wish to re-assess our results. These dark reference files may be found in subdirectories named DARKnn on the "RAW" CD ROMS. These dark reference files are also inverse time-ordered multiaccum .FITS files, so they may be immediately paired and subtracted from individual test data files of the same readout spacings and numbers. These "darks" were assembled from suites of individual frames identified in "dark.log" file accompanying the reference files on the CD ROM. The dark reference files carry the root name of the raw data plus "_DRK" of the chronologically first NCC OFF multiaccum which went into its construction. Also in these directories are files with corresponding names postfixed "_PIX", which gives for every pixel in each read, the number of individual readouts which went into making its reference value.
Table 3.2 Sample LOG file Correlating Image data and NCC Telemetry

06Jul2000 15:40:11 - NICMOS NCS Noise FITS + Labview Post Processing Logfile: fits2a-1.log Processing I00179155504_2RUV4A1_PP.FITS with /labview/Jun27_02.out:obsdate=06/27/00 16:03:35UT EXT SAMPTIME ISTEP EXPTAG TIMETAG Labview Date+Time 26 0.000 0 2000062716:03:35 2000062716:03:37 Tue, Jun 27, 2000 4:03:37 PM 25 1.198 1 2000062716:03:36 2000062716:03:37 Tue, Jun 27, 2000 4:03:37 PM 24 2.395 2 2000062716:03:37 2000062716:03:37 Tue, Jun 27, 2000 4:03:37 PM . . . 3 27.543 28 2000062716:04:03 2000062716:04:05 Tue, Jun 27, 2000 4:04:05 PM 2 28.740 29 2000062716:04:04 2000062716:04:05 Tue, Jun 27, 2000 4:04:05 PM 1 29.938 30 2000062716:04:05 2000062716:04:05 Tue, Jun 27, 2000 4:04:05 PM 26 extensions updated (see I00179155504_2RUV4A1_PP.FITS) . . .

Glenn Schneider, Steward Observatory, UofA

August 15, 2000


NCC/NICMOS SPARE-DETECTOR EMI TEST

5

4. TEST SEGMENTS (A Summary/Guide to The EMI Test Data Collection) Testing was carried out over three days using a combination of stored command load segments generated from two science Mission Specifications, and real-time commanding. Both stored and real-time command segments were executed on a SITS system communicating with the GSFC VEST/NICMOS-BRZ replica flight electronics. Early on the first test day, day 178, the SITS system failed. While some preliminary data was obtained with the NCC OFF (and used to validate the test set up), these were not used in the EMI and system noise analyses and are not discussed further. The problem was subsequently resolved and testing resumed on day 179. All data discussed in this report, and delivered to STScI, were obtained on days 179 and 180. The EMI data frames collected and used in our analyses consisted of repeated series of differential measures obtained with the NCC OFF, and with the compressor running at a variety of speeds. Three different methods of sampling were employed, with primary emphasis given to collecting sets of three 26-read multiaccums with 1.2 seconds between readouts. This sampling strategy was employed in the April, 1998 EMI test where the original ~ 6-9 kHz broadband EMI problem was identified,. We defer to that test report to further describe the rational for this sampling strategy. In addition, at the request and specification of STScI additional data collections were made using asynchronous delta times between reads, and using STEP64 sampling, exactly replicating one of the commonly used detector integration timing sequences used on orbit. Finally, sets of 30 back-toback 2-read multiaccum frames, used to evaluate the read-noise, were taken by a real-time procedure, and hence are not on either of the SMSs. These frames were taken at the start and end of each day, whenever we changed a mechanical or electrical configuration, or occasionally to measure the stability of the read-noise. These four data collection sequences are identified in the test segment summary as follows:
RN UA ST S2 "Read "UofA "STScI "SMS2 Noise" Sequence" Sequence" Long Seq" 30 3 5 4 2-read 26-read 10-read STEP64 1.2s integration MA frames 1.2s delta time MA frames asynchronous delta time MA frames MA frames - Long integrations (SMS2)

The UA sequences (which are the focus of the analysis in this report) were interleaved on SMS1 with the ST sequences. In Table 4.1 the test-segment image sequences are presented in chronological order, along with very brief explanatory notes of the H/W configuration. The timetags, such as 178151503, give the time that the data were "dumped" from the NICMOS replica electronics, and are attached as part of the file names for that execution of the particular sequence. The same timetag name appears for all sequential repeats (e.g., 3 of UA, or 5 of ST). Unique file name identifiers, which increase monotonically, are postpended to the timetags. The UA, ST, and S2 sequences were reformatted as multiple science extension multiaccum FITS files on the DAY0179 and DAY180 CD ROMS. The RN sequences are provided only as simple single-read FITS files, so the set of 30 RN exposures are constituted by a set of 60 files of (first, last) read pairs, named sequentially (monotonically) in their directories.

The execution order of these sequences is somewhat in variance with the pre-approved test plan (Hubble Space Telescope FS&S Project, NCC/NICMOS EMI Noise Test, I&T Ptocedure, P-4422488). This was done to accommodate problems we had due to SITS failures, preemptive shut downs due to local lightning storms (storm code confition 3), and authorization to run the cooler at speeds in excess of 6500 rps for protracted (< 20 minute) durations.

Glenn Schneider, Steward Observatory, UofA

August 15, 2000


NCC/NICMOS SPARE-DETECTOR EMI TEST

6

Table 4.1

Test and Data Segment Summary

Shorted Buffer Box Test (BRZ Check Out) .................................................................. 178/0a 178151503 RN 30 SBB NCC GSE OFF Not Grounded Detector Operations Test .................................................................. 178/0b 178175742 RN 30 Detector NCC GSE ON Not Grounded .................................................................. ESTABLISH HST-LIKE GROUND CONNECTIONS NCC/DETECTOR Initial Read Noise Evaluation for Test Configuration .................................................................. 178/0c 178185936 RN 30 Detector NCC GSE ON Initial Dark Frames to make "super dark" medians .................................................................. 178/0d-1 178191704 UA 3 Detector NCC GSE ON 178/0d-2 178192209 ST 5 Detector NCC GSE ON 178/0d-1 178192526 UA 3 Detector NCC GSE ON 178/0d-2 178193031 ST 5 Detector NCC GSE ON 178/0d-1 178193348 UA 3 Detector NCC GSE ON .................................................................. POD File CSIN00178193348 corrupted, 178193853 and 178194210 bad SITS System Failure - No Data for Remainder of Day .................................................................. BRZ OFF, DEWAR REMOVAL, PUMP OVERNIGHT, AM REFILL Day 179 Initial Read Noise Frames .................................................................. 179/0a 179124242 RN 30 Detector NCC OFF Day 179 Dark Frames to make "super dark" medians .................................................................. 179/0b-1 179130004 UA 3 Detector NCC OFF 179/0b-2 179130509 ST 5 Detector NCC OFF 179/0b-1 179130826 UA 3 Detector NCC OFF 179/0b-2 179131331 ST 5 Detector NCC OFF 179/0b-1 179131648 UA 3 Detector NCC OFF 179/0b-2 179133253 ST 5 Detector NCC OFF 179/0b-1 179132510 UA 3 Detector NCC OFF 179/0b-2 179133015 ST 5 Detector NCC OFF .................................................................. Ground Strap Conductance Measurements Made Lights in EMI Clean Room Turned Off (flickering flourscent) Darks to Verify No Change after Conductance Measures .................................................................. 179/0c-1 179141204 UA 3 Detector NCC OFF 179/0c-2 179141709 ST 5 Detector NCC OFF 179/0c-1 179142026 UA 3 Detector NCC OFF 179/0c-2 179142531 ST 5 Detector NCC OFF .................................................................. CLI Heater Turned Off to Check for Additional Noise Signatures Darks to Verify CLI Heater Lines Are Not a Noise Source .................................................................. 179/0c-1 179142848 UA 3 Detector NCC OFF 179/0c-2 179143353 ST 5 Detector NCC OFF Glenn Schneider, Steward Observatory, UofA August 15, 2000


NCC/NICMOS SPARE-DETECTOR EMI TEST

7

179/0c-1 179143710 UA 179/0c-2 179144215 ST

3 Detector 5 Detector

NCC OFF NCC OFF

.................................................................. CLI Heater Turned Back On NCS Operations @ 5500 rps .................................................................. 179/1a-1 179151304 UA 3 Detector NCC ON 5500 rps 179/1a-2 179151809 ST 5 Detector NCC ON 5500 rps 179/1a-1 179152126 UA 3 Detector NCC ON 5500 rps 179/1a-2 179152631 ST 5 Detector NCC ON 5500 rps 179/1a-1 179152948 UA 3 Detector NCC ON 5500 rps 179/1a-2 179153453 ST 5 Detector NCC ON 5500 rps 179/1a-1 179153810 UA 3 Detector NCC ON 5500 rps 179/1a-2 179154315 ST 5 Detector NCC ON 5500 rps NCS Operations @ 6500 rps .................................................................. 179/2a-1 179155004 UA 3 Detector NCC OFF 179/2a-2 179160009 ST 5 Detector NCC OFF 179/2a-1 179160326 UA 3 Detector NCC RAMP UP 179/2a-2 179160831 ST 5 Detector NCC RAMP UP 179/2a-1 179161148 UA 3 Detector NCC ON 6500 rps 179/2a-2 179161653 ST 5 Detector NCC ON 6500 rps 179/2a-1 179162010 UA 3 Detector NCC ON 6500 rps 179/2a-2 179162515 ST 5 Detector NCC ON 6500 rps NCS Operations @ 7200 rps (max 20 minute on time) .................................................................. 179/3a-1 179165504 UA 3 Detector NCC OFF 179/3a-2 179170009 ST 5 Detector NCC RAMP 5500-6750 rps 179/3a-1 179170326 UA 3 Detector NCC RAMP 6750-7200 rps 179/3a-2 179170831 ST 5 Detector NCC ON 7200 rps 179/3a-1 179171148 UA 3 Detector NCC ON 7200 rps 179/3a-2 179171553 ST 5 Detector NCC ON 7200 rps 179/3a-1 179170210 UA 3 Detector NCC ON 7200 rps 179/3a-2 179172515 ST 5 Detector NCC ON 7200 rps .................................................................. NCC OFF for cool down Read Noise Evaluation .................................................................. 179/0d 179174337 RN 30 Detector NCC OFF NCS Operations @ 7000 rps (20 minute maximum) .................................................................. 179/4a-1 179175304 UA 3 Detector NCC OFF 179/4a-2 179175809 ST 5 Detector NCC OFF 179/4a-1 179180126 UA 3 Detector NCC RAMP 5500-7000 rps 179/4a-2 179180631 ST 5 Detector NCC ON 7000 rps 179/4a-1 179180948 UA 3 Detector NCC ON 7000 rps 179/4a-2 179181453 ST 5 Detector NCC ON 7000 rps 179/4a-1 179181810 UA 3 Detector NCC ON 7000 rps 179/4a-2 179182315 ST 5 Detector NCC ON 7000 rps .................................................................. NCC OFF for cool down NCS Operations @ 6800 rps (20 minute maximum) .................................................................. 179/5a-1 179185404 UA 3 Detector NCC OFF 179/5a-2 179185909 ST 5 Detector NCC OFF 179/5a-1 179190226 UA 3 Detector NCC RAMP to 6800 rps Glenn Schneider, Steward Observatory, UofA August 15, 2000


NCC/NICMOS SPARE-DETECTOR EMI TEST

8

179/5a-2 179/5a-1 179/5a-2 179/5a-1 179/5a-2

179190731 179191048 179191553 179191911 179192415

ST UA ST UA ST

5 3 5 3 5

Detector Detector Detector Detector Detector

NCC NCC NCC NCC NCC

ON ON ON ON ON

6800 6800 6800 6800 6800

rps rps rps rps rps

.................................................................. NCC OFF for cool down NCC Operations @ 6200 rps .................................................................. 179/6a-1 179194305 UA 3 Detector NCC OFF 179/6a-2 179194809 ST 5 Detector NCC OFF 179/6a-1 179195129 UA 3 Detector NCC RAMP to 6200 rps 179/6a-2 179195631 ST 5 Detector NCC ON 6200 rps 179/6a-1 179195948 UA 3 Detector NCC ON 6200 rps 179/6a-2 179200453 ST 5 Detector NCC ON 6200 rps 179/6a-1 179200810 UA 3 Detector NCC ON 6200 rps 179/6a-2 179201315 ST 5 Detector NCC ON 6200 rps .................................................................. NCC OFF for cool down Dark Frames for SMS-2 (STEP64 Integrations) .................................................................. 179/7a 179210356 S2 4 Detector NCC OFF (SMS2) .................................................................. NCC RAMP up to 6500 rps before SMS Start NCS Operations @ 6500 rps .................................................................. 179/7b 179215056 S2 4 Detector NCC ON 6500 rps (SMS2) .................................................................. NCS OFF (end of day, weather code 3, lightning storms in area) Day 179 Final Read Noise Evaluation .................................................................. 179/0e 179220955 RN 30 Detector NCC OFF .................................................................. BRZ OFF, DEWAR REMOVAL, PUMP OVERNIGHT, AM REFILL DEWAR RE-INTEGRATED, GROUND STRAPS ATTACHED, CURRENT PROBE REMOVED Day 180 Initial Read Noise Evaluation .................................................................. 180/0a 180124047 RN 30 Detector NCC OFF NCC Operations @ 7200 rps (repeatability from day 179, 20 minute max) .................................................................. 180/1a-1 180124904 UA 3 Detector NCC OFF 180/1a-2 180125498 ST 5 Detector NCC OFF 180/1a-1 180125726 UA 3 Detector NCC RAMP 7000-7200 rps 180/1a-2 180130231 ST 5 Detector NCC ON 7200 rps 180/1a-1 180130548 UA 3 Detector NCC ON 7200 rps 180/1a-2 180130553 ST 5 Detector NCC ON 7200 rps 180/1a-1 180131410 UA 3 Detector NCC ON 7200 rps 180/1a-2 180131915 ST 5 Detector NCC ON 7200 rps ............................................................. NCC OFF for cool down NCC Operations @ 6100 rps .................................................................. 180/2a-1 180134204 UA 3 Detector NCC OFF Glenn Schneider, Steward Observatory, UofA August 15, 2000


NCC/NICMOS SPARE-DETECTOR EMI TEST

9

180/2a-2 180/2a-1 180/2a-2 180/2a-1 180/2a-2 180/2a-1 180/2a-2

180134709 180135531 180130231 180135848 180140353 180140710 180141215

ST UA ST UA ST UA ST

5 3 5 3 5 3 5

Detector Detector Detector Detector Detector Detector Detector

NCC NCC NCC NCC NCC NCC NCC

OFF RAMP ON ON ON ON ON

to 6100 rps 6100 rps 6100 rps 6100 rps 6100 rps 6100 rps

NCC Operations @ 6200 rps .................................................................. 180/3a-1 180142104 UA 3 Detector NCC OFF 180/3a-2 180142609 ST 5 Detector NCC OFF 180/3a-1 180142926 UA 3 Detector NCC RAMP to 5900 rps 180/3a-2 180143431 ST 5 Detector NCC ON 5900 rps 180/3a-1 180143748 UA 3 Detector NCC ON 5900 rps 180/3a-2 180144253 ST 5 Detector NCC ON 5900 rps 180/3a-1 180144610 UA 3 Detector NCC ON 5900 rps 180/3a-2 180145115 ST 5 Detector NCC ON 5900 rps Read Noise Evaluation .................................................................. 180/0b 180151040 RN 30 Detector NCC OFF NCC Operations @ 5700 rps .................................................................. 180/4a-1 180151804 UA 3 Detector NCC OFF 180/4a-2 180152309 ST 5 Detector NCC OFF 180/4a-1 180152626 UA 3 Detector NCC RAMP to 5700 rps 180/4a-2 180153131 ST 5 Detector NCC ON 5700 rps 180/4a-1 180153448 UA 3 Detector NCC ON 5700 rps 180/4a-2 180153953 ST 5 Detector NCC ON 5700 rps 180/4a-1 180154310 UA 3 Detector NCC ON 5700 rps 180/4a-2 180154815 ST 5 Detector NCC ON 5700 rps NCC Operations @ 5000 rps .................................................................. 180/5a-1 180155804 UA 3 Detector NCC OFF 180/5a-2 180160309 ST 5 Detector NCC OFF 180/5a-1 180160626 UA 3 Detector NCC RAMP to 5000 rps 180/5a-2 180161131 ST 5 Detector NCC ON 5000 rps 180/5a-1 180161448 UA 3 Detector NCC ON 5000 rps 180/5a-2 180161953 ST 5 Detector NCC ON 5000 rps 180/5a-1 180162310 UA 3 Detector NCC ON 5000 rps 180/5a-2 180162815 ST 5 Detector NCC ON 5000 rps Read Noise Evaluation .................................................................. 180/0c 180180728 RN 30 Detector NCC OFF .................................................................. COOLER MOVED CLOSER TO DEWAR. DISTANCE CLOSURE FROM 3FT. TO 1FT. WORST-CASE RADIATED EMISSIONS SUSCEPTIBILITY Read Noise Evaluation .................................................................. 180/0d 180183710 RN 30 Detector NCC OFF NCC Operations @ 7200 rps (repeatability @ 1ft distance) .................................................................. 180/6a-1 180184604 UA 3 Detector NCC OFF 180/6a-2 180185109 ST 5 Detector NCC OFF 180/6a-1 180185426 UA 3 Detector NCC RAMP 7000-7200 rps 180/6a-2 180185932 ST 5 Detector NCC ON 7200 rps 180/6a-1 180190248 UA 3 Detector NCC ON 7200 rps Glenn Schneider, Steward Observatory, UofA August 15, 2000


NCC/NICMOS SPARE-DETECTOR EMI TEST

10

180/6a-2 180190753 ST 180/6a-1 180191110 UA 180/6a-2 180191615 ST

5 Detector 3 Detector 5 Detector

NCC ON NCC ON NCC ON

7200 rps 7200 rps 7200 rps

.................................................................. NCC OFF for cool down NCC Operations @ 7200 rps SMS2 .................................................................. 180/7a 180201456 S2 4 Detector NCC ON 7200 rps (SMS2) Dark Frames for SMS2 .................................................................. 180/7b 180210156 S2 4 Detector NCC OFF (SMS2) Dark Frames for SMS1 .................................................................. 180/0e-1 180211304 UA 3 Detector NCC OFF 180/0e-2 180211809 ST 5 Detector NCC OFF 180/0e-1 180212126 UA 3 Detector NCC OFF 180/0e-2 180212631 ST 5 Detector NCC OFF 180/0e-1 180212949 UA 3 Detector NCC OFF 180/0e-2 180213453 ST 5 Detector NCC OFF 180/0e-1 180213810 UA 3 Detector NCC OFF 180/0e-2 180214315 ST 5 Detector NCC OFF Read Noise Evaluation .................................................................. 180/0f 180220100 RN 30 Detector NCC OFF .................................................................. BRZ OFF, DEWAR REMOVAL, BEGIN WARM-UP

Glenn Schneider, Steward Observatory, UofA

August 15, 2000


NCC/NICMOS SPARE-DETECTOR EMI TEST

11

5. DETECTOR CHARACTERISTICS, THERMAL STABILITY& DEWAR MAINTENANCE The NICMOS flight spare detector #97T0012 and the test dewar employed have significant pedigrees and both are well characterized and calibr