FEB Production

1

Ben 12/15/14: "Board 1 wasn't getting a link when Omar tested last week. When I run on my desk with the test firmware it works fine. I recommend we flash the normal firmware back and try again."

Omar 12/15/14: When hybrids are powered up, the current of CH 0 DVDD is ~0 and the currents of CH 1 and 2 AVDD are ~0.

1/27/15 - Fixed bad Hybrid regulators. Board seems to work now.

Waiting to be reworked. Initial test have shown that only 19/20 APV's can be synced.

Ben 12/16/14 - Omar and were able to get all APVs to sync. Need to take data to see what noise looks like.

Ben 01/16/14 - Issues observed in baseline ADC values with no hybrids attached. Replaced preamplifier circuit for hybrid channel 2, adc ch 2. Replaced ADC for hybrid channel 1. Baseline ADC values seem good now (~0x2000 on all 20 ADC channels).

1/25/15 - Hybrid0-ch3 and ch4 have high base and low peak.

12/10/14

 results

Waiting to be reworked. Initial test have shown that, except for the edge channels, the noise on FEB CH 0-2 ranges from ~47-50 ADC counts. This is consistent with previous observations so these channels seem fine.

There is a ripple in the noise present on FEB CH 03 and the noise across the whole hybrid is ~10 ADC counts higher than the rest of the channels.

1/25/15: All of FEB CH3 has high peaks and low bases. Board has normal 250MHz OSC instead of MEMS.

1/27/15: VTERM opamp that creates 1.25V reference for CH3 appears to be dead. Will replace.

1/30/15 - Sent to Amtech. Hy Ch 3 ADC and all CH3 preamps were replaced. Found bad cap (C354) on CH3 VTERM that Tan replaced. All channels sync well.

Ben 12/15/14 - Had short on C743. Fixed now. Needs testing with RCE.

Omar 12/15/2014: Looks fine after fix was applied.

Had power up issues when installed on plate. These issues haven't been seen when running on a bench. Not sure what's wrong but holding it out of the rotation.

Pelle 2/23/16: Back to SLAC from JLab for testing. 

12/11/14

results 1, results 2

After power cycling? everything looks fine now.

1/30/15 - U21 replaced at Amtech. Channel 2:4 is still bad.

12/10/14

results

L4b?

(Replaced with 13 1/21/2015)

Baseline has tails and the shifts in the noise are present on the same APV's as before (on CH 1) but otherwise it looks fine. 

1/21/15: A+2.9V_DVDD regulator circuit blew up. Replaced regulator. Still see issues. Cant reach 2.9V. Likely a bad cap somewhere.

1/23/15: Replaced all of the bypass caps on A+2.9V_DVDD. Voltage seems stable now.

1/25/15: All Channels sync. All base and peak values look good.