2020/01/27 (Monday)

Previous Day

1500	Electrical checks on side coaxes in cleanroom. Pins labeled based on either detector (D) or tower (T) end of side coax. Used HP 4275A LCR meter to measure Cc.
	these are CDMSII position-4 length side coaxes. We haven't used them in a while but we will want to in the next run so we can put the source mover in the first position and the detector in the second position.

Side Coax : ZB4-4
Pin 1	Pin 2	Component	Value
T1	D1	PAret	20 Ω
T2	D2	PA	20 Ω
T3	D3	PBret	20 Ω
T4	D4	PB	20 Ω
T5	D5	PCret	20 Ω
T6	D6	PC	20 Ω
T7	D7	PDret	20 Ω
T8	D8	PD	20 Ω
T9	D9	LED1	20 Ω
T10	D10	LED2	20 Ω
T11	D11	QO bias	26 nS
T12	D11	QO Cc	<0.1 nS
T12	D11	QO Cc	296 pF
T12	T13	QO FB	26 nS
T14	D12	QI bias	26 nS
T15	D12	QI Cc	>30 nS
T15	D12	QI Cc	291 pF
T15	T16	QI FB	26 nS
all pins	GND	-	<0.1 nS

Side Coax : ZB1-4-6
Pin 1	Pin 2	Component	Value
T1	D1	PAret	20 Ω
T2	D2	PA	20 Ω
T3	D3	PBret	20 Ω
T4	D4	PB	20 Ω
T5	D5	PCret	20 Ω
T6	D6	PC	20 Ω
T7	D7	PDret	20 Ω
T8	D8	PD	20 Ω
T9	D9	LED1	20 Ω
T10	D10	LED2	20 Ω
T11	D11	QO bias	26 nS
T12	D11	QO Cc	<0.1 nS
T12	D11	QO Cc	295 pF
T12	T13	QO FB	26 nS
T14	D12	QI bias	25 nS
T15	D12	QI Cc	9 kΩ
T15	D12	QI Cc	295 pF
T15	T16	QI FB	26 nS
all pins	GND	-	<0.1 nS

Side Coax : ZB1-4-8
Pin 1	Pin 2	Component	Value
T1	D1	PAret	15 Ω
T2	D2	PA	15 Ω
T3	D3	PBret	15 Ω
T4	D4	PB	15 Ω
T5	D5	PCret	15 Ω
T6	D6	PC	15 Ω
T7	D7	PDret	15 Ω
T8	D8	PD	15 Ω
T9	D9	LED1	15 Ω
T10	D10	LED2	15 Ω
T11	D11	QO bias	25 nS
T12	D11	QO Cc	<0.1 nS
T12	D11	QO Cc	325 pF
T12	T13	QO FB	25 nS
T14	D12	QI bias	26 nS
T15	D12	QI Cc	<0.1 nS
T15	D12	QI Cc	328 pF
T15	T16	QI FB	25 nS
all pins	GND	-	<0.1 nS

All phonon and LED channels are working. The coupling capacitors on ZB4-4 and ZB1-4-6 both have the right capcitances (~300 pF) but are also shorted. Perhaps the capacitors' dielectric is partly broken down?

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