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Entry  Wed Nov 23 18:28:09 2011, Koji, Update, IOO, RFAMPD channels / EOM monitor channels added to DAQ 
    Reply  Thu Nov 24 05:10:00 2011, Koji, Update, IOO, RFAMPD channels / EOM monitor channels added to DAQ 
       Reply  Thu Nov 24 10:27:07 2011, Jenne, Update, IOO, RFAMPD channels / EOM monitor channels added to DAQ EOM_temp_sense_heater_drive_schematic_withMONs.png
          Reply  Thu Nov 24 12:45:12 2011, Zach, Update, IOO, RFAMPD channels / EOM monitor channels added to DAQ 
             Reply  Thu Nov 24 13:54:31 2011, Koji, Update, IOO, RFAMPD channels / EOM monitor channels added to DAQ 
Message ID: 5999     Entry time: Thu Nov 24 13:54:31 2011     In reply to: 5998
Author: Koji 
Type: Update 
Category: IOO 
Subject: RFAMPD channels / EOM monitor channels added to DAQ 

Those clips for the readouts were the ones who popped out.
When I have restored the connections, I checked the schematic and the heater drive mon is clipped on the output side of the OP27.

Quote:

Jenne: The point you indicate for the heater monitor is a virtual ground--it will be driven to zero by the circuit if it's functioning properly; the readout should be done at the input pin (2, I think) to the BUF634.

Koji: This is odd, as I made a point of not attaching any clips directly to resistors for exactly this reason. I was also careful to trim resistor/capacitor leads so that they were not towering over the breadboard and prone to bending (with the exception of the gain-setting resistor of the AD620, which was changed at the last minute). At the end of the day, it is a breadboard circuit with Pomona "readout", so it's not going to be truly resilient until I put it on a protoboard. Another thing: I think the small Pomona clips are absolutely terrible, since they slip off with piconewtons of tension; I could not find any more regular clips, so I used them against my better judgment. 

 

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