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.

U87 1380 HOT.png

U93 HOT Wire.

U93 1380 HOT.png

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.

U38 1360 HOT.png

U40 Warm wire.

U40 1360 WARM.png

U51 Hot wire.

U51 1360 HOT.png

U65 Hot wire.

U65 1360 HOT.png

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