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Entry  Tue Jul 9 11:37:37 2013, gautam, Update, CDS, set up for testing DAC Interface-board pin outs 
    Reply  Tue Jul 9 12:01:20 2013, gautam, Update, CDS, set up for testing DAC Interface-board pin outs 
       Reply  Tue Jul 9 18:44:37 2013, gautam, Update, CDS, DAC Interface Board-Pin Outs DAC_Interface_Board_Pin-out.pdfbreak-out_ribbon.JPG
          Reply  Tue Jul 23 04:07:48 2013, gautam, Update, CDS, Excitation points set up on c1scx 
             Reply  Tue Jul 23 16:47:01 2013, gautam, Update, CDS, Excitation points set up on c1scx 
                Reply  Tue Jul 23 19:38:58 2013, gautam, Update, CDS, Characterisation of DAC at 1X9 
Message ID: 8814     Entry time: Tue Jul 9 18:44:37 2013     In reply to: 8811     Reply to this: 8900
Author: gautam 
Type: Update 
Category: CDS 
Subject: DAC Interface Board-Pin Outs 

  Summary:

The pin-outs for the DAC interface board have been determined.

Details:

  • I used a temporary break-out cable (pic attached) and connected the 40pin IDC connector on this to the DAC interface board at 1Y4.
  • I had a hypothetical pin-out map which was to be verified. So I connected pairs of ribbon wire to an oscilloscope in the configuration which I believed to be correct, and then used awggui to send a 3Hz, 10000 count sine-wave to the corresponding channel via the excitation points set up earlier.
  • I verified that the correct waveform showed up on the scope screen. I then tried sending the same signal to another DAC channel and verified that there were no accidental shorts/bad connections. The signal was fairly noisy, but this was probably because of the makeshift connections.
  • Repeated the above for all 8 channels in the bank marked 9-16 on the DAC interface board.

Turns out that my deductions using the D0902496 wiring diagram, a spare D080303 DAC to IDC adaptor and a multimeter were correct! The pin outs as determined by this test are sketched in the graphic below.

To Do:

  •  Now that the pin-outs have been determined, I need to go about making the custom ribbon that will connect the 40pin IDC on the DAC interface board to the 10-pin IDC on the PZT driver board. Because there is a pair of wires that will have to be 'skipped' while going from the 40-pin to the 10 pin IDC (corresponding to the pair not-connected between two DAC channels on the 40-pin IDC), this may be tricky.

Misc:

The excitation points added to the simulink model are still there, I plan on keeping it as such till I finish installation of the boards as they will be useful for testing purposes.

 

Pin-Outs of the DAC to IDC Adaptor (D080303) inside the "DAC Interface Box at 1Y4":

DAC_Interface_Board_Pin-out.pdf

 

Makeshift break-out ribbon cable:

 

break-out_ribbon.JPG

 

 

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