From wagner@fnal.gov Wed Nov 7 21:14:05 2001 Date: Wed, 07 Nov 2001 18:41:16 -0600 From: Bob Wagner To: Evelyn Thomson , Avi Yagil , dittmann@fnal.gov, Greg Veramendi , joao , Peter Tamburello , Robyn Madrak , Aseet , Ayana , Bill Robertson , Eiko , JC Yun , Ken Schultz , Kevin Burkett , Kevin Pitts , Kirby , Marina Brozovic , Morris , Ting , Tom Phillips , Young-Kee , Dave Ambrose , Nigel Lockyer , Bill Orejudos , Peter Wittich Subject: COT day shift work [ Part 1, Text/PLAIN (charset: ISO-8859-1 "Latin 1 (Western Europe)") ] [ 72 lines. ] [ Unable to print this part. ] [ The following text is in the "iso-8859-1" character set. ] [ Your display is set for the "US-ASCII" character set. ] [ Some characters may be displayed incorrectly. ] COT work on11/7 Day shift: *)Install SL4-227 ASDQ (spare) and HVDB (see below) --> ch 0, 1, 3, 4, 5 disabled. -->Plugged in both ASDQ DB (spare) and HVDB. Capmeter P (0-12) = 2.89, 2.53, 2.85, 2.89, 2,86, 2.54, 2.88, 7*2.5x; S (0-11) = 8.56, 5.80, 8.88, 9.06, 9.02, 8.8, 6*5.8. These are as expected. Microcoax is plugged in, but not yet checked with Spy or readout. *)Wrap of Al / bubble-wrap over SVX and L00 tubes. -->WEST done, but EAST was not available. (Do on Thursday?). *)SL8-232/233 (B,366,15-14-2): High QEN widths (See Dave's sheet). -->Replaced jumper but QEN doesn't making contact, so this is definitely a marginal socket on the CV board. Changing QDR acts like any other ASDQ, but QEN is always "enabled". This is probably not so bad, since SL8 is always run with QEN = 0 (enabled). Checked all signals with SPY. *)SL4-160/161 (C,418,16-07-2) Double calibration pulse -->Calibration line broken 1 foot from endboard as Dave suggested. After repair, all channels looked normal with Spy. *)Faraday cage tighten and copper tape: Inspect and fix. -->Done except: -->LEAVE FOR LATER: SL5-220/221 *)Dave's SL6 quad b "Null noise" problems (from his Master): SL6-098 (B,237,03-14-1): 00 dead, 00 hot!, 00 warm, 12 null SL6-099 (B,237,03-14-1): 00 dead, 09 hot!, 01 warm, 02 null --> Extreme null noise on even, hot noise on odd, good occ on all, high DTH on all. -->Spy: Calibration pulse has largish reflection at 100ns, and most channels see this at some level. Calibration DC connections are good through to the ASDQ. From the timing, Morris and I suspect broken microcoax ground(s) on the calibration line AT THE REAPEATER INPUT. This is on top, so we can't check until the Plug is closed. Still need to check cell 98 -101 for Plug-in problems with Spy or Readout. SL6-104 (B,240,03-13-0): 00 dead, 00 hot!, 00 warm, 12 null SL6-105 (B,240,03-13-0): 00 dead, 01 hot!, 00 warm, 11 null --> Large null noise, half DTH size. -->Spy: Similar situation to SL6-098, except the reflected calibration pulse at 100ns is much larger and all channels double pulse strongly. Calibration DC connections are good through to the ASDQ. We again expect broken Microcoax grounds at the REPEATER input (need Plug closed). Still need to check for Plug-in problems with Spy or Readout. SL6-108 (B,242,03-13-2): 00 dead, 00 hot!, 01 warm, 08 null SL6-109 (B,242,03-13-2): 00 dead, 02 hot!, 03 warm, 04 null --> Moderate null noise, good occ, DTH. -->Spy: Calibration pulse and all signal pulses look good. No noticable reflections or noise. I would leave it. SL6-178 (B,361,05-15-1): 00 dead, 00 hot!, 00 warm, 08 null SL6-179 (B,361,05-15-1): 00 dead, 01 hot!, 01 warm, 07 null --> Null noise, probably from crossed wire 179#05, low DTH. -->Spy: Some very weak reflections on signal lines at 160ns (timing indicates from ASDQ). 179#5 has an irregularly shaped pulse that come about 20ns EARLY. Morris turned off the 3v and still saw a signal. There appears to be some crosstalk between the calibration and 179-5 (they are next to each other in the Microcoax). From the timing it appears to be somewhere intermediate in the cable. We decided to punt on this one, since things are fine in the data, and the calibration is reasonable except for 179-5.