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2020/02/13 (Thursday)

Previous Day

1410 Threaded rods (brass M2) finally arrive. We also bought M2 brass nuts. Now we can finish stack assembly.
1420 Cut 5-inch lengths of M2 threaded rod and file the edges so that nuts go on easily. 5 inches seems just right for a 3-housing stack (housings for 1.3-inch high detectors)
1440 Assembled the 3-housing stack with the threaded rods and nuts.
1450 Put side coax ZB1-4-6 on DIB 4, ZB1-4-8 on DIB 1. Connected DIP 3 to tower face 2 using the side coax adapter.
1500 Connected the accessories to tower face 4.
1535 Tower electrical check, some problems.
  1. DIB4 pC open - specifically Pin 5 open to everything, Pin 6 seems ok.
  2. DIB4 LED2 (pin 10) open
  3. Sporadic shorts were seen from phonon channels to chassis, but they disappeared.
1545 Remove DIB4 side coax. DIB4pC problem seen at detector DIB. Open LED seen at side coax extender, but haven't checked yet in housing.
1605 Disassemble stack and open G101D housing. DIB4 pin5 wirebond looks too short, no arc to it at all. Apparently it popped off at the detector bond pad.
1610 The LED problem seems to be simply that the solder joint from wire to side coax extender pin came loose. Resolder this connection.
This resoldering was for pin 9 NOT pin 10.
1640 Turns out the LED was never soldered to pin 10, but pins 8 and 9 instead, resoldering the connection on pin 8 to pin 10.
1700 Rebond DIB4 pin5 in the wirebonder lab
1725 Reassemble stack, tighten threaded rods, reattach side coaxes and SCAB. Looks like LEDs and DIB4pC are OK.
Note: to verify LEDs I had to connect to MC stage for chassis - maybe lower stages have high resistances to MC stage.
quick check shows 4K stage isolated, other 3 shorted together
Ready to tape down wires and tape up holes. Then another electrical check.
Detector G101D DIB 1
side coax ZB1-4-8 date/who: 2020 Feb 13 DS, ZW, MF
face 3
+lead - lead signal typical previous measured
1 2 QET A 100 to 200 Ω 213 Ω
2 4 QETA-B 100 to 200 Ω 157 Ω
3 4 QET B 100 to 200 Ω 136 Ω
4 6 QETB-C 100 to 200 Ω 106 Ω
5 6 QET C 100 to 200 Ω 153 Ω
6 8 QETC-D 100 to 200 Ω Open
7 8 QET D 100 to 200 Ω Open
2 8 QETA-D 100 to 200 Ω Open
chassis 9 LED1 Rforward 8 to 9 MΩ Open
chassis 9 LED1 Vforward 1.0 to 1.1 V OL
9 chassis LED1 Rreverse <1 nS
chassis 10 LED2 Vforward 8 to 9 MΩ Open
chassis 10 LED2 Vforward 1.0 to 1.1 V OL
10 chassis LED2 Rreverse <1 nS
1 11 Qo Rbias 24 to 26 nS
12 11 Qo C coupling <1 nS
12 13 Qo Rfeedback 24 to 26 nS
1 14 Qi Rbias 24 to 26 nS
15 14 Qi C coupling <1 nS
15 16 Qi Rfeedback 24 to 26 nS
All pins → Ground all <1 nS <1 nS
Detector G101D DIB 3
side coax SCAB date/who: MF, DS, ZW
face 2
+lead - lead signal typical previous measured
1 2 QET A 100 to 200 Ω Open
2 4 QETA-B 100 to 200 Ω Open
3 4 QET B 100 to 200 Ω Open
4 6 QETB-C 100 to 200 Ω Open
5 6 QET C 100 to 200 Ω 94 Ω
6 8 QETC-D 100 to 200 Ω Open
7 8 QET D 100 to 200 Ω Open
2 8 QETA-D 100 to 200 Ω Open
chassis 9 LED1 Rforward 8 to 9 MΩ
chassis 9 LED1 Vforward 1.0 to 1.1 V
9 chassis LED1 Rreverse <1 nS
chassis 10 LED2 Rforward 8 to 9 MΩ
chassis 10 LED2 Vforward 1.0 to 1.1 V
10 chassis LED2 Rreverse <1 nS
1 11 Qo Rbias 24 to 26 nS
12 11 Qo C coupling <1 nS
12 13 Qo Rfeedback 24 to 26 nS
1 14 Qi Rbias 24 to 26 nS
15 14 Qi C coupling <1 nS
15 16 Qi Rfeedback 24 to 26 nS
All pins → Ground all < 1 nS < 1 nS
Checked pC to DIP 1 pA: 202 Ohms
Detector G101D DIB 4
side coax ZB1-4-6 date/who: MF, DS, ZW
face 5
+lead - lead signal typical previous measured
1 2 QET A 100 to 200 Ω Open
2 4 QETA-B 100 to 200 Ω Open
3 4 QET B 100 to 200 Ω Open
4 6 QETB-C 100 to 200 Ω Open
5 6 QET C 100 to 200 Ω Open
6 8 QETC-D 100 to 200 Ω 200 Ω
7 8 QET D 100 to 200 Ω 212 Ω
2 8 QETA-D 100 to 200 Ω Open
9 chassis LED1 Rforward 8 to 9 MΩ 0.788 MΩ
9 chassis LED1 Vforward 1.0 to 1.1 V 1.086 V
chassis 9 LED1 Rreverse <1 nS < 1 nS
10 chassis LED2 Rforward 8 to 9 MΩ .778 MΩ
10 chassis LED2 Vforward 1.0 to 1.1 V 1.086 V
chassis 10 LED2 Rreverse <1 nS < 1 nS
1 11 Qo Rbias 24 to 26 nS
12 11 Qo C coupling <1 nS
12 13 Qo Rfeedback 24 to 26 nS
1 14 Qi Rbias 24 to 26 nS
15 14 Qi C coupling <1 nS
15 16 Qi Rfeedback 24 to 26 nS
All pins → Ground <0.1 nS 5,6,7,8 short to chassis
Detector G101D DIB Accessories
side coax - date/who: 2020 Feb 13 MF
face 4
+lead - lead signal typical previous measured
1 2 Motor Coil A 5-10 kΩ 7.10 kΩ 7.10 kΩ
3 4 Motor Coil B 5-10 kΩ 7.54 kΩ 7.54 kΩ
5 chassis Backward endstop - ground open open open
6 chassis Forward endstop - ground open open open
8 9 Screw terminals ~20 Ω - 69.9 Ω
11 12 Electrode low Ω - 53.9 Ω
all pins chassis chassis isolation <1 nS - <1 nS

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