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4. successfully controls the experiment while it is in the space simulator.
5. successfully controls the heater under varying (fluctuating) temperature
conditions.
The test of “Autonomous Mode” (3.) should be part of a full worst-case test
including
• simulated loss of communication, several times during ascent and during floating
• fast temperature fluctuations (simulated by stimuli or real) in the −50 ◦
to 50 ◦ range
• loss of power during ascent, floating and in “Autonomous Mode”
A report shall be given for each of the prescribed tests. It shall contain the
final test parameters and the test result. In case of non-compliance.
4.2.3
Electronics Testing
4.2.3.1 Control Box All electronic components are commercial with different industrial standards. Temperature ranges are stated in appendix (E).
However, all critical components are inside the heated control chamber, which
should always be kept between 0C and 85C to make use of the internal calibration of the pressure sensor in this range.
4.2.3.1.1 Results of control box thermal test The electronic box
has been tested thermally using a thermal chamber. The temperature was
raised from room temperature up to 50 ◦ C. The temperature sensors were
calibrated using this thermal chamber. No flaws were detected during this.
4.2.3.1.2 Results of control box vacuum test The electronic box
was placed in the vacuum chamber, without any connection to outside. The
pressure in the vacuum chamber was rapidly reduced to 40 kPa.
No bursts of components were detected and all soldering spots remained
faultless.
4.2.3.2 Batteries The batteries will according to their manufacturer lose
or gain performance depending on there temperature (see figure (9)) The
passive thermal control system must be tested with batteries working at full
load. Preferably the temperature should be kept as close to 70◦ C as possible.
Means of finetuning the design are thermal wrapping or thermal paste.
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