1. Gayle K. Martin November 14, 2016
FIELDS V5 Thermal iPER
Gayle K. Martin
November 14, 2016

2. V5 Thermal Cycling Objectives and Summary
Test Objectives
Qualify the flight model of the V5 instrument
Verify that the V5 unit can bear the temperatures
Provide workmanship and performance verification
Component temperatures shall be tested to 10°C beyond flight model predicts
Test Summary
1 survival and 6 operational thermal cycles will be complete in vacuum
CPTs (Electrical Functional Test) will be conducted at the first and last operational cycles at cold and hot temperatures
LPTs (same Electrical Functional Test) will be conducted for all other operational cycles

3. V5 Thermal Cycling Test Configuration
Chamber configuration
The V5 flight units will be tested in the UCB/SSL SNOUT1 thermal vacuum chamber
There are four temperature zones for the TV test
Chamber baseplate (heating & cooling)
Chamber shroud (heating & cooling)
Cold finger (cooling)
Mounting plate heater (heating)
Hardware configuration
The flight unit will be fully assembled
Micro-Faze K will be used to electrically isolate V5 from the chamber baseplate
There are 2 configurations for the vacuum cycling
Survival soaks and V5 warm-up characterization: Cold-finger and mounting plate heater
Operational soaks: Remove cold finger and mounting heater, V5 will be hard mounted to chamber baseplate (less thermal mass for op cycling)
V5 flight unit in bench test configuration

4. V5 Thermal Cycling Test Configuration
Electrical configuration
The harness will be connected to a feedthrough to connect to the V5 GSE external to the chamber
The flight instruments will be controlled and internal thermistor monitored via the V5 GSE connected externally to the chamber

5. V5 Thermal Cycling Test Configuration
Thermocouples will be mounted along the flight unit, and harness to verify temperatures during thermal cycling
Internal thermistor will verify that the temperatures have stabilized
TC #
Location
Red limit cold (°C)
Yellow limit cold (°C)
Yellow limit hot (°C)
Red limit hot (°C)
Baseplate
-200
-140 75 90
Shroud
Cold Finger
-160
110
120
V5 electronics box, baseplate
Heater zone 3
-150
115
V5 electronic box, top
-145
-135
V5 mounting plate

6. V5 Thermal Cycling Test Profile
The test duration for the combined thermal cycling test will take ~5 days (assuming 4 hour soaks) including set-up and take-down time
Instrument functions
Pre-test functional
Hot and cold operation CPTs (op cycles 1 and 6)
Hot and cold operation LPTs (op cycles 2 through 5)
Post-test functional
Test parameters
The transition rate of the instrument is not to exceed 3°C per minute
Start of soak is defined when the control temperature is within 1°C of the test temperature
Soak is defined as a minimum of four hour at case temperatures with a change in temperature of ±1°C
Temperature profile on following slide
Future vacuum testing
Additional vacuum exposure will occur on the flight hardware
The V5 assembly will “ride-along” with the FIELDS MEP in thermal cycling
6 operational cycles from -25°C to 60°C
1 survival cycle from -30°C to 65°C

7. V5 Thermal Cycling Test Profile

8. Back-up

9. Handling & Contamination Control
All test articles and test hardware to be bagged and kept in clean room
Personnel are to handle only with appropriate gloves and contamination gowning
EMECP specifications shall be practiced during flight hardware handling, test set-up and test operations
Contamination control of the instrument must follow the specifications in the SPP-FIELDS Contamination Control Plan 

10. Test Abort, Real Time Activity Assessment and Success/Failure Criteria
Minor anomalies will be evaluated and fixed or alleviated in an attempt to continue testing
Examples of minor anomalies include temporary loss of thermocouple, minor problems with hardware (cable movement) or problems with vacuum facility
Response to minor anomalies will be made by Test Conductors at test site
Significant anomalies will result in abort of further testing
The UCB Test Engineer has the authority to stop testing if deemed damage may be occurring to the hardware, the test equipment functioning is suspect, output data is questionable, or test is not compatible with this procedure
All anomalies shall be reported as part of standard Project Problem/Failure Reporting.
Success/Failure Criteria
Adequate temperature data collected at steady state from all test cases
Meet all S/C requirements

11. V5 Other Thermal Testing
Completed thermal tests
ETU test
V5 ETU (EM) underwent a TB test on the APL boom Jan 2016
The thermal model has been correlated to the thermal balance test
LN2 “shock test” on preamp
Future thermal tests
The V5 assembly will “ride-along” with the FIELDS MEP in thermal cycling
6 operational cycles from -25°C to 60°C
1 survival cycle from -30°C to 65°C
Thermal balance test on boom during SPP Observatory test estimated 12/2017

12. V5 EDTRD Thermal Requirements
Complete
Description
0179
Throughout thermal balance and thermal cycle testing, each instrument subsystem or instrument component shall be powered unless there is an identified potential for damage and a waiver has been obtained from APL
0189
Instruments shall complete a successful thermal vacuum flight qualification testing program prior to delivery to the spacecraft
0190
Testing program shall consist of thermal vacuum balance and thermal vacuum cycle
0191
All instruments thermal test plans shall be provided to the SC thermal engineer for review and approval
0192
Flight predictions shall demonstrate at least 10°C of margin within the instrument operational or survival test temperatures with the exception that for active heater control, 5°C of temperature margin is acceptable at the lower test limit
0207
Instrument thermal vacuum cycle tests do not have to maintain the isolated coupling used during thermal balance. This should decrease transition time between cycles, thus total test time. Instrument component temperatures shall be based on flight model predictions if the isolation coupling is not flight-like
0208
Instrument component temperatures shall be tested to 10°C beyond flight model predictions
0209
Flight model testing shall complete six operational and one survival cycle
0212
CPT’s shall be conducted during instrument level TV testing
0213
Minimal functional tests shall be performed at all remaining plateaus if no CPT performed