SELECTED  ITEMS  OF
SIXA  FM  ACCEPTANCE  TESTS
 28.08.-02.09.2000
HELSINKI, VTT
 
 

In accordance to plan of the Acceptance Tests for Flight Models which was agreed in March 2000 in Moscow, the Acceptance Test of SIXA FM was carried out between 28 August and 2 September at VTT Automation, Finland.

Special test equipment of IKI was used during the Acceptance Tests. The sequence of test is listed below.

SIXA Flight Model inside the clean room

Inspection of Documentation

Inspection of SIXA Documentation was carried out. Following documents were given by the Finnish team to the Russian specialists:
- External Cabling Plan for SIXA EBOX
- TCU Board Specification
- TCU Circuit Diagram
- SIU Circuit Diagram
- SIXA GSE Userís Manual
- GOUCH for electronics box of SIXA-FM, Remark: not updated after changes made in 1994.
- SIXA-FM passport,
- GSE SIXA-FM passport,
- SIXA-FM technical description, Remark: not updated after modifications of Electronics Block
- GSE SIXA-FM technical description,
- SIXA-FM user manual,
- GSE SIXA-FM user manual,
- Ground Test Program of SIXA-FM.
 


  Incoming inspection of SIXA-FM

Visual inspection of SIXA Electronics Box. Some remarks were made.
Checking of 7HA and 8HA connectors signals: Isolation tests, 27V, RC 750-757, 1Hz, Analog-, Contact and Temperature TM-parameters. No remarks.
Checking of SIXA-FM and GSE SIXA documentation. No remarks.
 

SIXA FM DC/DC1 (Russian) converter
SIXA FM Electronic Box
 
Autonomous test of SIXA-FM + GSE SIXA

Autonomous test of SIXA-FM + GSE SIXA was performed according to Technical Description and User Manual for SIXA-FM.
 
 

SIXA FM during the tests: on left - Electronic Box, on right - cryostat with the detector 
SIXA FM Electronic Box, on left - russian DC/DC1 converter
 
The energy resolution tests for all pixels are in table below. The best resolution was about 186 eV for pixels 5 and 7. Pixels 10, 14, 17, 18, 19 has unacceptable large noise and therefore unfit for the work. The problem of detector elements/pixels that have large noise must be studied and corrected.
Autonomous test of SIXA-FM using sit3bn.six and sit3c.six cyclograms. No remarks.
 
Table 1. Energy resolution of the all SIXA pixels (detector temperature 116 K, high voltage 585 V).
 
Pixel
Resolution, 
eV
Pixel
Resolution, 
eV
Pixel
Resolution, 
eV
1
197
8
240
14
-
2
~200
9
196
15
295
3
~200
10
-
16
326
4
209
11
241
17
-
5
184
12
323
18
-
6
205
13
280
19
-
7
185
 
 
 
 
SIXA Interface Box - board service systems simulator for the autonomic tests

 Integration Test of SIXA FM, BIUS, ISS, DSS, and MPMI
 
 Assembly of working place for complex test according to circuit scheme for SIXA-FM + ISS (connectors 7HA, 8HA).
 
 Assembling of working place with Russian test equipment ISS + BIUS + DSSF + DSSS + MPMI + SRG-bus (board and ground buses).
 
 First switching of Russian test equipment (ISS + BIUS + DSSF + DSSS + MPMI + SRG-bus (board and ground buses)).
 
        Normal observation mode

 Preparation of cyclogram "Normal observation mode" with 4 different targets: ON-sot-fot-sot-fot-sot-fot-sot-fot-BGC-Dump-OFF.
 
 Results of "Normal observation mode" cyclogram work:
- Test data were written to MPMI, DSS-F, DSS-S and GSE SIXA-FM,
- Scientific blocks received: SIXA A = 5712, SIXA B = 854, (indeed on the contrary, SIXA-A gave 854, and SIXA-B 5712, see Remark below)
 
 Remark:
 Connectors of SRG-bus A and B are mistakably marked by the labels of each other. This leads to misunderstanding of what SIXA, A or B data are received from.
 
 Decision:
 Temporarily connectors 54H (on SB4) and 59H (on SB8) of SRG-bus were reconnected to the places of each other in order to avoid further misunderstandings in tests.
 

SIXA acceptance tests and main part of its participans

        Emergency test

Preparation of cyclogram "Emergency test" with 3 different Dumps: ON-sot-fot-ERB-BGC-DUMP1-sot-BAT-BGC-DUMP2-sot-ECO-BGC-DUMP3-OFF
 
 Note: DC/DC2 and Hard Disk 2 operated in this test.
 
 
 Results of "Emergency test" cyclogram work:
- Test data were written to MPMI, DSS-F, DSS-S and GSE SIXA-FM,
- Scientific blocks received: SIXA A = 115, SIXA B = 2042,
- Power consumption was less than in previous test 1,4A in Observation time and 1,0A in Ground Contact. This depends on different mode of work.
- No indication of SIXA "On" (CC2) contact parameter, because this parameter goes only from DC/DC1 (Russian) converter and is missing in DC/DC2 (American). No further actions are needed, this remains so.

GSE SIXA on the first plane and SIXA FM behind the wall in the clean room
 
        Long normal observation

Normal observation with 1 target with 10 minutes single exposition, while in 000883002 test with 4 targets there were 10 of 1-minute expositions in order to see variability of the target. One minute is too short for some pixels to begin data collection in that concrete situation.
 
 Note:
- DC/DC1 and Hard Disk 1 operated in this test.
- This test was provided without test pauses (STOPs) between commands.
 
 Results:
- Data were written to MPMI, DSS-F, DSS-S and GSE SIXA-FM.
- Scientific blocks collected: SIXA-A: 20 blocks, SIXA-B: 2042 blocks.
- Power consumption in Observation mode: 1.8A, in Ground contact: 1.4A
No remarks.


 Conclusion

The results of the SIXA FM Acceptance Tests confirmed good functioning of the instrument and good compatibility with the SRG spacecraft service systems in general.
 


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