Can I attach thermistors probes directly to a BNC-2110 for temperature measure?

[physicsgeek]

I have four high accuracy Thermistors. I wish to take temperature measurements using labview 8.2.1. Am I able to do this by connecting directly to a BNC-2110?

[Weiyuan]

BNC-2110 is only a connector panel, right?  You need a DAQ board.

Thermistors -> BNC-2110 -> DAQ-Board -> LabVIEW Control -> convert voltage to temperature.

[physicsgeek]

I have a DAQ-card as well. The DAQ-card is as NI PCI-6034E. I am wondering more about if it would give a noisy measurement? The NI temperature setups seem to include signal conditioning.

[Weiyuan]

Well, it depends on how accurate you need.  Since you have all the parts, why not just connect them up and try.  You can try to filter it if it is noisy.  I measured temperature using other instruments before and not required high accuracy.

[J_Thomas]

Some good references for these type of measurements can be found at the following links:

Measuring Temperature with an RTD or Thermistor

Working with Thermistors and RTDs

Noisy and Accuracy

It should physically be possible to use the setup you have suggested. The PCI-6034e does provide 16 bits of resolution so it is a board capable of taking very "accurate" readings.  However, since we are dealing with readings in the low mV, if there is any noise present in the system, it could alter your readings by a relatively large amount.  The best solution for this is to provide some type of filtering to remove that noise.  You could choose to do this yourself by building a simple filter or you could use our SCXI solution which has onboard filters that could remove this noise automatically.  Also, if you are using LabVIEW, you could provide filters in software which would clean up your signal.  It really depends on the accuracy that your application requires as well as the noise present in your setup.  I would recommend trying the measurement with the PCI-6034e and seeing if this meets your needs or is too noisy.  However, SCXI, an acronym for "Signal Conditioning eXtensions for Instrumentation", would probably be the best solution possible.

For example the following document discussing one example using an SCXI module:

Making High Accuracy Thermocouple/Temperature Measurements Using the SCXI-1112 Module

Let us know how it goes and we would be glad to provide some additional suggestions.

[pjoule]

similiar question refer to message subject,

my question are how about if i've strain gauge, PXI 6070E DAQ board and BNC 2110 to measure the strain, can i connect them directly? or do i need strain adaptor or strain meter to get the measurement?

[pjoule]

similiar to the message subject, my questions are

how about if i've 4 Strain gauge, PXI 6070E, and BNC 2110 and Labview 7.1 to measure the strain, can i connect them directly? or do i need strain meter or strain adaptor to get the measurement?

[J_Thomas]

It should physically be possible to use the setup you have suggested, however, like the setup discussed in previous posts, your accuracy will likely be poor. The BNC 2110 has analog inputs and pinouts to provide a 5 volt excitation, but since are dealing with readings in the low mV range, any noise present in the system will have a large affect on the results.

Your best solution would be to get some external strain signal conditioning or look into replacing the BNC-2110 with a signal conditioning modules such as the SCC or SCXI series that are designed for strain gauge measurements.