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2012/05/30

2200 Start tower assembly procedure.
2355 Conduct electrical check of flexible side coaxial cable on bench. Known problems listed below. Detector capacitor was resoldered such that it sits between Qo and QET B Return. No other changes made, and no other problems witnessed. Side coax is just a tad too long, so bent like a caterpillar as Gary suggested.
  1. No continuity along Qi bias. wire.
  2. No continuity along QET A Return.
Table 1: Flexible Side Coax Electrical Check on Bench.
Signal Measurement
Qi
Qi feedback - Qi gate 12.6 nS
Qi feedback - Qi bias <0.1 nS
Qi gate (on SCUHBA) - ground <0.1 nS
Qi gate (on SCAB) - Qi bias <0.1 nS
Qi gate (on SCAB) - ground 12.6 nS
Qi bias - ground <0.1 nS
Qi bias - Qi (at DIB) <0.2 nD nS
Qi gate (on SCUHBA) - Qi (at DIB) 1.4 nF
Qo
Qo feedback - Qo gate 12.6 nS
Qo feedback - Qo bias <0.1 nS
Qo gate (on SCUHBA) - ground <0.1 nS
Qo gate (on SCAB) - Qo bias <0.1 nS nS
Qo gate (on SCAB) - ground 12.6 nS
Qo bias - ground <0.1 nS
Qo bias - Qo (at DIB) 25 nS
Qo gate (on SCUHBA) - Qo (at DIB) 1.4 nF
No unexpected shorts to ground!
Figure 1: Asembled Tower with Flexible Side Coax v4.