SCB-68 direct crossing

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  Thanks for posting. I think the question might be to see you about the how the SCB-68 must be configured in mode of direct crossing to be used with the connector 1 on the PXI-6225. When the switches on the block are defined for a direct crossing, the Council is not connected to the CJC. Do not have a connection to a CCM on this connector could cause this problem.

  A potential solution, you can try is to connect a temperature probe to AI16 and follow the steps in this KB, using that channel instead of the CJC channel. Let me know if it helps!

  Kind regards

  Joe S.

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• SCB-68 AIGND vs AIGND

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  I apologize for the enigmatic title, but I'm a little confused on the difference between the screws AIGND fastons (67, 32, 64, etc.) and the AIGND on the area on the conditioning of signals of PCB SCB-68 box.

  I'm trying to accurately measure a signal 0 - 10V on analog channel 1 mode differential.  I followed directions (see link) connection for differential measurements by adding resistors of polarization on the sign (+) and (-) entered to AIGND pin # 67.  With this configuration I sometimes see saturation in my measurements because of the high common-mode voltage.  I then withdrew my PIN # 67 AIGND polarization resistors and added resistances of polarization in the region (RC14 and RC15) as suggested in figure 5-1 conditioning of signals of PCB and my measurements seems correct and do not saturate.  It seems to me that these two should be the same, but I get different results.  Measures of resistance between screw AIGND fastons (67, 32, and so on) to the AIGND showed high impedance which suggests that they are not the same conditioning of signals of PCB.  All my switches are assigned to the default settings.

  What is the difference between the two AIGNDs, and that AIGND should I use?

  SCB-68 68-pin shielded connector block the user manual:

  http://www.msm.cam.AC.UK/mechtest/docs/scb68%20Manual.PDF

  Material:

  PCI 6221 M data acquisition card

  SCB-68 interface

  Best regards

  HV

  HV:

  These two AIGND are connected inside the data acquisition card, it will appear an impedance high unless the SCB - 68 on the DAQ card.  I measured ~ 35Ohms when connected, open the circuit without.  Additionally, make sure that switch S3 is down, by trial and error, I've found this causes impedance jumps.

  Hope this helps,

• PCIe-7842r to SCB-68 has

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  Dear Sir

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