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How can I measure the internal resistor of the 9944/9945 quarter bridge completion module?

Hardware: CompactDAQ>>Analog Input Modules>>NI 9327 with D-SUB

Problem:
I need to verify the internal resistor of the quarter bridge completion module. How can I do this?

Solution:
The internal resistor for the 9944 and 9945 is 120 and 350 ohm, respectively. You can measure the internal resistor one of two ways.

With RJ-50 cable which has wires exposed at one end:

1. Connect the RJ-50 cable to the 9944/9945.
2. Connect wires 7 and 10 of the RJ-50 together.
3. Measure with a DMM from the 7 & 10 connections to screw terminal 2 on the 9944/9945.

If you have a 9949 available:

1. Jumper screw terminals 7 and 10 of the 9949 together with wire exposed
2. Connect the 9944/9945 to the 9949 via the RJ-50
3. Measure with a DMM from jumper wire to the screw terminal 2 on the 9944/9945.
   Note: the resistance will not be precise to the resistor due to the added resistance from the cable.

Related Links:
NI 9944/9945 Quarter Bridge Completion Accessory User Guide

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Report Date: 09/15/2011
Last Updated: 09/15/2011
Document ID: 5PECOTH3

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