FLATSAT Testing

This page contains the FLATSAT tests that were conducted to verify Power verification activities for FLATSAT as shown in the table below. These set of tests start with communicating with the CDH through the terminal and adding the rest of the subsystems as the FLATSAT plan continues.

Activities Verified on February 25, 2022

Verification activities V-POW-0190, V-POW-2006, V-POW-3034, and V-POW-3120 were done on February 25, 2022. Below is the detailed report for the tests.

V-POW-0190

Verification Activity Text

Test the power module at the spacecraft level by reading the sensors that measure current and observing if the components are receiving unregulated voltage of greater than 6.4 V at SOC > 40% through the 7 load switches and meeting the power conditioning needs of the subsystems including the technology demonstration components based on https://sites.google.com/site/manitobasat1/subsystems/power/power-icd#h.p_ru1XD74gdm8P

Verification Method

Use the FLATSAT terminal and CDH (EM/ Breadboard model) to send commands to the power controller board, Turn on each load by sending the command to terminal, connect programmable load to each switch output and verify the voltage and current are appropriate based on the needs of each subsystem according to Electrical interface summary https://sites.google.com/site/manitobasat1/subsystems/power/power-icd#h.p_ru1XD74gdm8P

Required Equipment

Programmable load

Verification Evidence

read the voltage and current shown on the programmable load and take a picture

ADCS Load switch:

CDH Load switch: *This load switch could provide a maximum current of 280 mA

COM Load switch:

PLD Load switch: *This load switch could provide a maximum current of 240 mA

ANT-DPL Load switch:

SOL-DPL Load switch:

DATEC Load switch:

MINCO Load switch: *This output is designed to be always on. Current sensor is tested here.

V-POW-2006

Verification Activity Text

Test the restraint mechanisms in the flatsat test by checking if current is passing through a dummy load such as a resistor, thus, proving that power is provided to the restraint mechanisms. The dummy load acts as a representation of the burn wire circuit load. The circuit shall be able to provide a current of 1A +- 0.1 mA

Verification Method

connect the load to the switch output. send the command through Terminal and read the current sensor value. the current shown should be about 1000mA +- 100mA

Required Equipment

8 Ohm resistor (or alternatively programmable load set to 1000mA), Terminal

Verification Evidence

read the voltage current sensor value in Terminal and provide pictures of the Terminal and the setup

ANT-DPL Load switch:

SOL-DPL Load switch:

V-POW-3034

Verification Activity Text

Test the DET switches by replacing the solar arrays with a current source. Perform the test in with the flight model at flatsat, the solar arrays should have the voltage as the bus voltage. The voltage drop shall be less than 0.05V

Verification Method

connect the power supply in place of solar panels, set the current limit to 200 mA. connect the EM battery pack. send the [turn on solar array input (i)] to PCU. observe the power supply switch to the CC mode. write down the voltage reading of the power supply (+picture). send the [read MSB voltage] command to PCU. compare the terminal value with the voltage value from the power supply. the values should be the same +-0.05V for tolerance

Required Equipment

flatsat termianl, power supply, EM battery pack

Verification Evidence

terminal screenshot, power supply meter readings (pictures)

Solar Array Switch 0:

Solar Array Switch 1:

Solar Array Switch 2:

Solar Array Switch 3:

Solar Array Switch 4:

Solar Array Switch 5:

Solar Array Switch 6:

V-POW-3120

Verification Activity Text

Activate the inhibit switch to test if it isolates (no interconnecting conductors) the FM batteries from the negative terminal to ground at the flatsat test

Verification Method

connect a power supply in place of the battery pack. activate footswitches and the RBF switch. measure the continuity between the battery's negative terminal and the GND of the power subsystem, it should show no connection. release the footswitch, the multimeter should show connection between the GND and battery negative terminal

Required Equipment

multimeter (continuity test), power supply

Verification Evidence

pictures of the setup. continuity test results