R1 S6 SignalSearchLog

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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.

U01 Noise.png

U24 Warm Wire: This is a channel that always triggers a fake signal.

U24 1380 WARM.png

U38 Warm Wire.

U38 1380 WARM.png

U66 HOT Wire: This is a channel that always triggers a fake signal very often.

U66 1380 HOT.png

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. U15 SV 1289 Big Positive Spark.png

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