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2013/07/25

1800 Ran an electrical check. No shorts to ground were found. However, there were shorts between two twisted paris of CuBe wire: SQUID Bias B was shorted to SQUID Return B. Qo Source was shorted to Qo Drain.
1900 Took resistance measurements to determine where the short is.
Measured a resistance of 3.0Ω from SQUID Bias B to SQUID Return B on detector end of Candy. Measured a resistance of 16.3Ω from SQUID Bias B to SQUID Return B on E-Box end of Candy.
Measured a resistance of 3.4Ω from Qo Source to Qo Drain on detector end of Candy. Measured a resistance of 16.2Ω from Qo Source to Qo Drain on E-Box end of Candy.
Assuming candy is 3 meters long, the short is appromixately 45cm from the detector end of candy. This is almost exactly the same location as the bottom-most heat sink.
Table 1: UMN Made Stripline Pinouts by Wire Bundle
Bundle Stripline D Socket Breakout Box Material
1 50 and 32 Squid bias B (34) and Squid ret B (19) CuBe
1 33 and 16 feedback ret B (18) and feedback coil B (2) manganin
1 11 and 9 QET C (7) and QET ret C 2 (9) manganin
1 31 and 14 Squid ret A (20) and Squid bias A (4) CuBe
1 47 and 30 feedback coil A (37) and feedback ret A (21) manganin
2 46 and 48 QET D (38) and QET ret D 1 (36) manganin
2 45 and 28 Squid ret D (39) and Squid bias D (23) CuBe
2 5 and 4 QET ret A 2 (14) and QET ret A 3 (13) manganin
2 12 and 29 feedback ret D (6) and feedback coil D (22) manganin
2 15 and 17 QET A (3) and QET ret A 1 (1) manganin
3 1 and 18 QET ret A 5 (17) and QET ret B 4 (33) manganin
3 2 and 20 Qi drain (16) and Qi source (31) CuBe
3 39 and 38 FET heater + (45) and FET heater - (46) manganin
3 43 and 26 feedback coil C (41) and feedback ret C (25) manganin
3 25 and 42 LED 2 (26) and LED 1 (42) manganin
4 36 and 37 QET ret B 3 (48) and QET ret B 2 (47) manganin
4 41 and 40 QET ret D 3 (43) and QET Ret D 4 (44) manganin
4 10 and 27 Squid bias C (8) and Squid ret C (24) CuBe
4 44 and 22 QET ret D 2 (40) and QET ret B 1 (29) manganin
4 8 and 23 QET ret C 3 (10) and QET ret C 4 (28) manganin
5 49 and 13 QET B (39) and QET ret C 1 (13) manganin
5 19 and 35 QET ret A 4 (32) and FET tsense + (49) manganin
5 3 and 34 Qi bias (15) and Qi feedback (50) manganin
5 7 and 21 Qo bias (11) and Qo feedback (30) manganin
5 6 and 24 Qo drain (12) and Qo source (27) CuBe
2130 Uninstalled tower.