2016/05/20 (Friday) · UMN CDMS Wiki archive

1545	After uninstalling the tower, bring it into the clean room for a tower-level electrical check.

+lead	- lead	signal	typical	measured
Detector	G114	DIB	1
side coax	ZB1-4-4	date/who:	2016-05-20	DS AK AV
face	5
1	2	QET A	100 to 200 Ω	893 Ω (Doing 2→1 gives 1.9kΩ)
2	4	QETA-B	100 to 200 Ω	286 Ω
3	4	QET B	100 to 200 Ω	263 Ω
4	6	QETB-C	100 to 200 Ω	261 Ω
5	6	QET C	100 to 200 Ω	223 Ω
6	8	QETC-D	100 to 200 Ω	222 Ω
7	8	QET D	100 to 200 Ω	166 Ω
2	8	QETA-D	100 to 200 Ω	232 Ω
chassis	9	LED1 Rforward	8 to 9 MΩ	open
chassis	9	LED1 Vforward	1.0 to 1.1 V	open
9	chassis	LED1 Rreverse	<1 nS	<1 nS
chassis	10	LED2 Rforward	8 to 9 MΩ	710K
chassis	10	LED2 Vforward	1.0 to 1.1 V	1.090 V
10	chassis	LED2 Rreverse	<1 nS	<0.3 nS
1	11	Qo Rbias	24 to 26 nS	26 nS
12	11	Qo C coupling	<1 nS	<0.5 nS
12	13	Qo Rfeedback	24 to 26 nS	26 nS
1	14	Qi Rbias	24 to 26 nS	26 nS
15	14	Qi C coupling	<1 nS	13 nS
15	16	Qi Rfeedback	24 to 26 nS	26 nS

+lead	- lead	signal	typical	measured
Detector	G114	DIB	2
side coax	ZB1-4-6	date/who:	2016-05-20	DS AK AV
face	2
1	2	QET A	100 to 200 Ω	253 Ω
2	4	QETA-B	100 to 200 Ω	218 Ω
3	4	QET B	100 to 200 Ω	131 Ω
4	6	QETB-C	100 to 200 Ω	224 Ω
5	6	QET C	100 to 200 Ω	204 Ω
6	8	QETC-D	100 to 200 Ω	205 Ω
7	8	QET D	100 to 200 Ω	131 Ω
2	8	QETA-D	100 to 200 Ω	233 Ω
chassis	9	LED1 Rforward	8 to 9 MΩ	725 kΩ
chassis	9	LED1 Vforward	1.0 to 1.1 V	1.091 V
9	chassis	LED1 Rreverse	<1 nS	<0.4 nS
chassis	10	LED2 Rforward	8 to 9 MΩ	718 kΩ
chassis	10	LED2 Vforward	1.0 to 1.1 V	1.091 V
10	chassis	LED2 Rreverse	<1 nS	<0.3 nS
1	11	Qo Rbias	24 to 26 nS	22 nS
12	11	Qo C coupling	<1 nS	<0.3 nS
12	13	Qo Rfeedback	24 to 26 nS	26 nS
1	14	Qi Rbias	24 to 26 nS	25 nS
15	14	Qi C coupling	<1 nS	25 nS
15	16	Qi Rfeedback	24 to 26 nS	26 nS

+lead	- lead	signal	typical	measured
Detector	G114	DIB	3
side coax	ZB1-4-8	date/who:	2016-05-20	DS AK AV
face	3
1	2	QET A	100 to 200 Ω	117 Ω
2	4	QETA-B	100 to 200 Ω	204 Ω
3	4	QET B	100 to 200 Ω	171 Ω
4	6	QETB-C	100 to 200 Ω	155 Ω
5	6	QET C	100 to 200 Ω	114 Ω
6	8	QETC-D	100 to 200 Ω	192 Ω
7	8	QET D	100 to 200 Ω	166 Ω
2	8	QETA-D	100 to 200 Ω	193 Ω
chassis	9	LED1 Rforward	8 to 9 MΩ	open
chassis	9	LED1 Vforward	1.0 to 1.1 V	open
9	chassis	LED1 Rreverse	<1 nS	open
chassis	10	LED2 Rforward	8 to 9 MΩ	open
chassis	10	LED2 Vforward	1.0 to 1.1 V	open
10	chassis	LED2 Rreverse	<1 nS	open

	Bolded selections are irregular values. May indicate incorrect electrical behavior. No channels are shorted to ground.

1635	Both Qi Coupling Capacitors seem to have little to no resistance in our tower level checkout. Will have to measure the resistance across them directly on their side coaxes to confirm that they are the issue.