Quarter bridge for 9237

How do I select quarter bridge completion settings for 9237 with 9944?
Message Edited by Frederico Barros on 09-28-2007 09:02 AM

The 9237 is capable of full and half bridge measurements without addition equipment. In order to take quarter bridge measurements with the 9237 you need a quarterbridge completion resistor component (like the ni 9944). This turns your quarterbridge configuration into half bridge, which the 9237 can do. You will need one of these completion components for each of your strain gauges.
[will work for kudos]

Similar Messages

How to connect 2-wire strain gage to NI 9237 by quarter bridge

I have a Strain Gage: KYOWA KFG-20-120-C1-11 (2 wire) http://www.kyowa-ei.co.jp/english/products/gages/pdf/kfg-01.pdf, NI 9237 on a Compact DAQ (cDAQ 9174) and RJ-50 (10-pin modular plug to pigtail wires).
Strain Gage features:
Gage Factor: 2.08 +/- 1.0%
Gage Resistance: 120.2 +/- 0.2 Ohms
I'd like to connect them to measure the strain with quarter bridge configuration but I have some doubts about which line goes to which terminal.
Thanks.
Solved!
Go to Solution.

You can find the manual for the NI 9237 module here
It's a good idea to buy an NI 9944 or NI 9945 Quarter Bridge Completion Accessory if you're planning on using this module with a quarter bridge configuration, but you can look at the following diagrams to see what kind of internal connections are implemented: Connecting Strain Gauges and Shunt Resistors to the NI 9237
PS Posting in the DAQ or signal conditioning forums instead of Labview may get you better/faster answers.
Cheers
Message Edited by mishkin on 03-11-2010 02:40 PM
Misha

Selecting bridge type for 9237 module on cRIO

How do you select 1/2 or Full bridge completion and Shunt settings for 9237 Bridge module on cRIO? The getting started example only seems to set the data rate?. The FPGA Property Node only has Data Rate, Excitation, and ID params available as choices? Am using 8.2.1. Other discussion threads talk about configuring with MAX but for cRIO/8.2.1 MAX doesn't show modules, just the remote system top level.
Thanks,
Bruce

Hi Bruce,
The Half vs Full Bridge as well as the Excitation Voltage settings live in the properties page for the NI 9237 module in the LV Project (right-click module item>>Properties). See attached image.
JMota
Attachments:
9237 properties page.JPG ‏36 KB

Correct Choice of the QUARTER Bridge Type

Hello,
We have to measure 80x SG (strain gauge) channels with 20x NI-9237 modules in 3x cDAQ-9188 chassis. The CEng guy wants to use a passive SG for temperature compensation in all channels (although not needed because we use self compensating SGs in their temperature range). So he will glue the active SGs on the tested model, and he will glue the passive SGs on pieces of same material AWAY FROM THE MODEL - NO THERMAL CONTACT WITH THE MODEL!
This configuration for me is QUARTER Bridge Type 1 since the passive SGs (dummies) are just resistors unaffected by the seismic activities on the model.
However, he insists on Type 2 guided by its definition ("Strain Gauge Configuration Types" Tutorial) which sounds like his comprehension of his bridge. I stay with Type 1 because the dummies are not in a close contact to the tested model - I see them just as bridge completion resistors.
Can someone with expertise in SG conditioning and measurements help in solving this dilemma?
Thanks in advance,

OK, let me paraphraze my questions.
1. RemoteSensing
NI-9237 documentation says RemoteSensing is meant for HALF and FULL bridges, and for QUARTERs we should use shunt calibration. Since I plan to use Q2 which is not a HALF bridge will RemoteSensing be performed by the NI-9237 or not? If NOT, will measuring lead resistance do the job instead? I find it very awkward that this crucial info is missing from the NI-9237 documentation!
2. Brdge balancing
NI-9237 documentation says this module needs to know the "initial voltage" measured on disconnected ETERNAL part of the bridge to compensate for offset. I have used the "DAQmx Perform Bridge Offset Nulling Calibration.VI" to balance all my bridges in COMPLETED status prior to any acquisition. Is this doing the job so I do not have to measure the "initial voltages"?
The tasks of interest are the 3x cDAQ. The PXI task needs some IEPE current sources to be switched on for 60sec prior to the acquisition so that the PCB accelerometers can be initialized.
Thanks in advance,
Attachments:
SaveNullsFile.png ‏57 KB

SCXI 1520 quarter bridge setup will not output excitation voltage, but full bridge will

My SCXI system will not output an excitation voltage to the quarter bridge(verified with voltmeter). It works for a full bridge setup. When connected to a 'quarter bridge I' configuration, I can use MAX to null and shunt calibrate. The quarter bridge circuit appears to be balanced after the calibration, but the calibration results post a software gain factor close to zero, as well as a close to zero excitation voltage (eventhough I have the voltage configured for 5 volts). I have the SCXI 1520 module, the virtual channels, and the wiring properly configured (several years experience with this device). I'm using an old E series DAQ card AI-16XE-50, with the 50 pin cable that plugs in the back of the SCXI chassis. I noticed I had two bent pins with the cable connector module that plugs into the SCXI backplane. I was able to straighten them, so the cable connects properly, but I suspect the bent pin incident caused electrical circuit damage. Any suggestions on trouble shooting? None of the three 1520 modules I have will output an excitation voltage for a quarter bridge.

Sorry that I don't have an answer for you tyea, but I'm interested in your thread because I have a similar issue with a 1520. My excitation votltage, as measured with a DVM, is always 1V. I've tried 0V, 1V, 5V --- it's always 1V, on Full or Quarter bridge. I'm using a similar DAQ to yours - a PCI 16XE-10 (and a PCI-6030E on antother system).
I don't have a lot of experience with these modules. This could be a wiring or programmatic thing I'm doing wrong.
Richard

How do I wire my SCXI-1520 quarter bridge completion in parallel?

I have a quarter bridge set-up using the qtr completion in the system. In parallel with my strain gauge I'd like to have another resistor. I'm using the strain gauge as a dummy, and am interested in the current traveling in a parallel path through a film resistor as I change the film thickness. However, I'm not convinced that what I've wired has the strain gauge and other resistor in parallel. I have the strain gauge wired to: P+, QTR, S+ and the other gauge wired to QTR, S+.
Thanks!

Greetings,
You will want to wire the other gauge between P+ and QTR or between P+ and S+. To make this decision, you will need to determine how the lead resistances will affect your measurement. Page 2-4 of the SCXI-1520 User Manual (link available below) contains the wiring diagram for Quarter-Bridge Configuration I.
SCXI-1520 User Manual
Good luck with your application.
Spencer S.

How do I connect 16 strain gauges in quarter bridge arrangement to a SCXI 1322 connecter block?

Specifically, do I connect 4 bridge completion resistors to each VEX- channel or do I need to wire them together somehow first?

I have attached a bitmap image that explains how to wire a quarter-bridge strain gauge to the SCXI-1122 (with 1322 terminal block.) The 1122 only provides half-bridge completion, so you have to wire an extra resistor into the circuit to complete the bridge.
You can find this image in the SCXI-1122 User Manual, which is available for download at:
http://search.ni.com/search/query.html?col=alldocs&qp=%2Bcontenttype%3Aproductmanual&lk=2&layout=ProductManual&qt=1122
Attachments:
1122_strain.bmp ‏920 KB

Detailed Software Repair Instructions using Pc Companion(Win)or Bridge for MAC. (Update 8/5/2014)

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Don't forget to mark posts that answers the topic as Accepted Solution.
If you find any post helpful, press Kudos.
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Using libraries vs. Bridge for graphics in placeholder frames

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Quarter bridge for 9237

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