R1 S6 SignalSearchLog

Testing procedure

Things that may cause "noise" that are actually due to your testing setup:

• STB boards not securely attached to chamber. Make sure center screws (ones attaching directly to the chamber, not the nylon stand-offs) are tightened to 14 in. lb's.

• Scope's termination set to 1Mohm. Set the scope to 50ohm termination.

• Lower bandwidth of 1 Ghz scope to 200 Mhz. This attenuates peak height, but also rejects high frequency noise and reduces the noise level from 55-65 mV to ~11-15 mV.

Super Layer 1

STB-1 G1202220

Layer	Wire	Channel	Date	Comments
		U1		This channel presents higher noise level than the other ones, which makes difficult to get a signal with amplitude below 30mV. This behaviour extends to all the first channels of each connector in the board. however, if a high enough trigger level is set in the scope(~40mV), it is always possible to get a signal in these channels.
		U24		Warm Wire: This is a channel that always triggers a fake signal.
		U38		Warm Wire.
		U66		HOT Wire: This is a channel that always triggers a fake signal very often.
		U87		HOT Wire.
		U93		HOT Wire.

The rest of channels not mention here has a similar behaviour between them, with a noise level not greater than ~20mV.

STB-2 G1202266

Layer	Wire	Channel	Date	comments
		U38		Hot wire.
		U40		Warm wire.
		U51		Hot wire.
		U65		Hot wire.

STB-3 G1202273

Layer	Wire	Channel	Date	comments
		U1		Hot wire.
		U2		Hot wire.
		U39		Hot wire.
		U78		Hot wire.

STB-4 G1202275

Layer	Wire	Channel	Date	comments
		U15		This Board presents a unusual noise in all the channels. The noise is a big positive spark, which makes difficult the recolection of signals. However, It was possible by setting a higher trigger level in the scope.

STB-5

Layer	Wire	Date	comments

STB-6

Layer	Wire	Date	comments

STB-7

Layer	Wire	Date	comments

Super Layer 2

STB-1

Layer	Wire	Date	comments

STB-2

Layer	Wire	Date	comments

STB-3

Layer	Wire	Date	comments

STB-4

Layer	Wire	Date	comments

STB-5

Layer	Wire	Date	comments

STB-6

Layer	Wire	Date	comments

STB-7

Layer	Wire	Date	comments

CLAS12_R1_S6_QA