Functional Testing and Inspection Activities

Overview: Test operation of all internal thermistors during FlatSat testing.

Testing thermistors 0-5 in the FlatSat terminal code. Connect the thermistor to the first set of leads, ask the terminal to read the corresponding thermistor. Touch the thermistor with your fingers, this will increase the temperature. Ask the terminal to read the temperature again. Let go of the thermistor and wait for 5-10 seconds, ask the terminal to read the temperature again, and screenshot all the outputs (temperature reading) on the terminal. Repeat the process for all thermistor connections on the board.

Desired outcome: A record of 3 temperature readings, one close to room temperature, then you should see a temperature increase at the next reading (touch test), followed by a temperature decrease after letting go of the thermistor.

Required GSE:

• FlatSat, power source, soldered thermistor, camera.

Overview: Cycle power to thermal components to ensure the system can recover from power shutdowns.

Note: This has the same setup as V-THE-0182. The verification evidence for this is a video of the whole procedure.

Datec Heater

Ensure the thermistor is still taped to the Datec heater. Start recording the video.

Testing the off state

With the Datec heater off, turn off the power supply from the power source itself. Keep it off for 2-4 seconds, turn if back on and wait for 30 seconds while still recording. Repeat this 4 times (turning the power source off, waiting 30 seconds).

Desired outcome: Since the initial state of the heater is off, the heater should remain off while cycling the power. The video should show that the temperature is not changing.

Testing the on state

With the Datec heater on, turn off the power supply from the power source itself. Keep it off for 2-4 seconds, turn it back on, and wait for 30 seconds while still recording. Repeat this 4 times (turning the power source off, waiting 30 seconds).

Desired outcome: Since the initial state of the heater is on, the heater should turn back on after each power shutdown on its own. The video should show the temperature increase during each 30 second period following a power shutdown.

Minco Heater

Ensure the thermistor is taped to the minco heater. Start recording the video.

Testing the off state

With the Minco heater off, turn off the power supply from the power source itself. Keep it off for 2-4 seconds, turn if back on and wait for 30 seconds while still recording. Repeat this 4 times (turning the power source off, waiting 30 seconds).

Note: To ensure that the minco heater is off, use a multimeter to read either the voltage or current from the thermostat to the heater, it should be 0.

Desired outcome: Since the initial state of the heater is off, the heater should remain off while cycling the power. The video should show that the temperature and current draw from the power source is not changing.

Testing the on state

To test the on state, the thermostat has to first be cooled down. Use a compressed air canister to cool down the thermostat, once the canister itself is cold, tape the thermostat to the side of the can to keep its temperature down. When the temperature of the thermostat is low enough to turn on the minco heater, you should see a temperature increase on the temperature logger and an increase in the current draw on the power supply.

Desired outcome:

Since the initial state of the heater is on, the heater should turn back on after each power shutdown on its own. The video should show the temperature and current draw increase during each 30 second period following a power shutdown.

Required GSE:

• FlatSat, Primary and secondary heaters, temperature probe, power source, Kapton tape, compressed gas canister (electronics air duster), multimeter, stopwatch (like a phone), camera.