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Entry  Tue Oct 2 15:14:54 2012, jenne, jamie, Update, IOO, PZT diagnosis 
    Reply  Tue Oct 2 16:32:43 2012, Jenne, Update, IOO, PZT diagnosis 
       Reply  Thu Oct 4 01:06:52 2012, Jenne, Update, IOO, PZT diagnosis 
          Reply  Mon Oct 8 14:19:17 2012, Jenne, Update, IOO, PZT diagnosis - not fixed yet 
             Reply  Mon Oct 8 18:45:48 2012, Jenne, Update, IOO, PZT diagnosis - not fixed yet, possible solution 
                Reply  Mon Oct 8 21:42:17 2012, Jenne, Update, IOO, PZT diagnosis - not fixed yet, possible solution 
                Reply  Tue Oct 9 00:25:33 2012, Jenne, Update, IOO, PZTs - hacky solution in place!! 
Message ID: 7463     Entry time: Tue Oct 2 15:14:54 2012     Reply to this: 7465
Author: jenne, jamie 
Type: Update 
Category: IOO 
Subject: PZT diagnosis 

pzt2 mod signals matched slider vals for both pitch and yaw

  pzt2 yaw mon output = 6
  pzt2 pitch mon output = 11.3

From the PZT connector-converter board we determined the following pin-outs:

  X=Yaw:  red=1, white=14, black=3 
  Y=Pitch:  red=2, white=15, black=16

We believe that red is signal, white/black/shield are all ground.  We also believe (although this is from the PMC PZT) that the expected capacitance of the PZTs should be in the 100's of nF range.

Here are the readings from the two PZT dsub connectors:

  pin 1:14   PZT1 = ".003" on 2uF scale
             PZT2 = ".184"
   
  pin 2:15   PZT1 = ".002" on 2uF scale
             PZT2 = ".202"

So we think this means (given this crappy capacitance meter) that PZT2 is showing roughly 200nF, which sounds ok, but that PZT1 is indeed bad.

So next we investigate the PZT2 driver.

 
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