Design documentation of cold hardware: http://titus.stanford.edu/cdms_restricted/coldhardware/html/coldhardware.html

SQUET wiring checks:

The things to check for a SQUET's wiring are whether there is continuity where there should be, whether the various components show the right resistances, whether the wiring is “standard” or “flipped”, and whether there are shorts.

• Standard wiring is as indicated in the diagram
• In Flipped wiring, the QET and QET return pins are flipped on the Tower side (12-pin connector)
• The QET pins on the Tower (12-pin) side should show the large room-temperature input coil resistance when measuring to any of the other three QET pins

These are standard room-temperature values of various components:

• Continuous lines: less than a few Ω
• FET TSense diode: when measured forward, ~500 kΩ
• FET heater resistor: ~ 1 kΩ
• FET gate-to-drain or gate-to-source: ~500 kΩ
• QET shunt resistance: about 20/13 Ω if shunt resistance is 20/6.7 mΩ (these are apparently room-temperature wirebond resistances)
• QET input coil resistance: ~14 kΩ
• SQUID bias-return resistance: ~4 kΩ
• Feedback resistor+coil: ~20 kΩ

Here are notes on how to modify shunt resistances on SQUETs: hv2rewiring

notes:

• “ZC-37” is sometimes referred to in the wiki but I think this is ZC-39 (it's a little hard to read the label)
• “ZC-87” was referred to in Run 60 but this doesn't seem to exist. Maybe this is also ZC-39??
• “ZC-28” is referred to in the old days, going back to Run 35, but no longer seems to exist
  • Update: CDMS elog indicates Hassan sent this to UCB in Mar 2013
• “ZC-15” is also in old runs, but was sent to UCB in Nov 2010 according to the elog.
• On 2016 Apr 13 we got 6 SQUETs from Soudan: ZC-14,ZC-24,ZC-26,ZC-31,ZC-39,ZC-68. All accounted for in the above table except ZC-14, don't know what happened to that one.
  • Update: “ZC-14” is probably actually ZC-74
• italics indicate a SQUID chip problem that is verified on the SQUID card itself. So presumably not a connection problem (wirebonds all look OK by eye).
• ZC-74 jumper diagram below, for all S/L pins that connect at the middle layer. This is the view from the back of the FET card. Numbers refer to corresponding S/L pins. For example photo see 2019 Oct 25 run diary.
• 

Pin map