Simultaneous temperature and voltage measurement

We have a NI-4351 to measure both the temperature and a voltage across a resistor. We have utilized two successive flat sequence structure frames, each containing an AI-Single Scan SubVI, to first scan the voltage off the thermocouple, and the second to scan the voltage off the resistor. Our voltage readings across the resistor are roughly 3V.
When we run our VI without scanning the resistor voltage, our temperature readings are correct. However, once we connect the voltage supply to a channel on the terminal board, we notice two things:
1) A constant error of 2500
2) The voltage readings across the thermocouples shoot up three magnitudes of error to approximately 0.08 volts
Would we need to separate the two scans into two separate buffers? If so, how would we do this?
Much Appreciated!!

Coolest,
At first glance, this particular issue may be related to the fact that the 4351 can only be configured for one gain setting across all of its channels. I recommend that you connect both signals and run a program which only performs one measurement at a time, reconfiguring the board between each measurement. If you still have the problem, disconnect both signals and then measure each one at a time. Make sure that you are configuring the channels to be ground referenced. If you've tried all of this and are still experiencing the same problem, there might be some cross-talk occurring between the channels -- potentially due to a grounding issue.
I hope that this is helpful to you.
Thanks,
Alan L
Applications Engineer
National Instruments

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Hello everyone,
I recently upgraded my good old Core2Duo rig and bought a new cpu-motherboard-ram trio. My new specs is as follows:
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Anyways. I'm using softwares like HWmonitor, Coretemp, Realtemp and Intel Extreme Tuning Utility. Turbo Boost is also active. So the cpu is going up until 3.9 GHz. Other than that I'm on stock speeds, and motherboard's default values. Here are my temperatures:
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I also noticed that Prime 95 and OCCT is increasing my cpu voltage value from 1.156 to 1.21 while Intel Extreme Tuning's stress test and BurnInTest is using 1.156v. All these test are using %100 of the cores. Couldn't understand why there's a voltage increase on certain tests which leads my temps go even higher and higher. Will I encounter these kinds of random voltage increases during normal tasks? Like playing games, rendering some stuff etc..?
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Also I'm wondering if my temperature values are normal with the cpu cooler i have (Coolermaster 212evo)?
I also could buy some extra fans for my case (1 exhaust to top & 1 intake to side) and maybe a second fan for the cpu cooler if you guys think that these would help a bit.
Sorry for my English by the way. I'm not a native speaker.
Thanks for all your comments and suggestions already.

Thanks for the reply Nichrome,
I will follow your suggestions for the fans. Currently I don't have any fans on top. But I'm considering to buy some fans to top and side. So you get better results with top fans being exhaust right?
Also which fan are you using as the second fan for the cpu heatsink? I would buy one of these as well since we have the same heatsink.
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Can not measure temperature and voltage simultaneously

I am a beginner with labview. I want to measre temperature and voltage simultaneously. When I run
the VI, I can get temperature or voltage, but not togther. I attach my VI, please give me suggestion on
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Attachments:
heatflux.vi ‏1069 KB

Since I don't know your exact configuration I will make some basic assumptions based on how it appears that you have configured the DAQ Assistant Express VIs.
Assumptions:
1. You have only one DAQ board in your system.
2. You want to scan continously
3. You want to acquire 3 temperature channels at a rate of 1000S/s and take 100 readings at a time
4. You want to acquire 2 voltage channels at a rate of 1000S/s and take 1000 readings at a time.
Based on this configuration your first problem is that you have configured the DAQ board to acquire continously in the first call to the DAQ Assistant (your first frame of the sequence structure). This ties up all the analog acquisition resources without releasing them. When you make your second call to the DAQ Assistant (your second frame of the sequence structure) you are creating a conflict because the DAQ board is already busy running your first request. At this point you are probably receiving an error but you might not see this since you are not doing error checking in your code. This is also why you are only getting one set of data. Next iteration of the while loop the first call to the DAQ Assistance reconfigures the board and executes again and so the cycle repeats itself.
I don't have a DAQ board installed so I can't confirm with certainty if I am correct but you can do this by simply changing the DAQ Assistant properties. In the 'Task Timing' tab change from 'Acquire Continuosly' to 'Acquire N Samples'.
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Hello all,
I am relatively new to LabView and looking to extend a vi I am currently using.
I am trying to record voltage and temperature measurements from a Keithley 2182 nano voltmeter using a GPIB cable. I have a vi that can do this for either voltage or temperature not both. At the moment I only record what is shown on the display of the nano voltmeter.
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Hi,
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There should be something like:
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4. send GPIB command for changing Keithley to Temperature Measurement
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end
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