Reading a thermocoup​le with the SCXI 1520

Does the SCXI 1520 have something to account for the interface connection heat, and is it needed? I've heard this is what the thermocouple modules do, and it is necessary.

The SCXI-1520 uses the SCXI-1314 Module which does not have cold-junction(CJ)compensation capability - meaning it can not compensate for either the temperature of the connection to the DAQ system, nor, the additional voltage effect due to the dis-similar metal contacts of the DAQ system. This correction is absolutly necessary for accurate temperature measurement. I suggest you use a "third-party" cold junction module from a vendor such as OMEGA Engineering (www.omega.com). The CJ sensors are battery powered and reference the signal to 32 Deg F while at the same time providing standard copper leads for the DAQ system.

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     Am Getting Inaccurate Readings When Some Channels of the SCXI-1520/SCXI-1314 Are Open Circuits
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    Thanks
    Surender Kumar

    No, DAQmx is superior and I strongly recommend you used DAQmx
    Elijah, I guess I understood the problem that Sunder is facing, coz even I had experienced it 2 years back
    What happens is if you scan only the channels to which sensors/strain gauges are connected, all is fine and you get good strain readings.
    But if you happen to include an unconnected channel into the scan list, all the subsequent channels after the open channel will show saturated readings.
    Right, Surender??
    The problem we found, lies in the settling time of the E series DAQ card's ADC. Even we were using PXI 6071 E
    Once the ADC saturates on reading an open channel, it cannot settle fast enough to read the next channel.Hence, the next channel also reads saturated value, instead of the correct value.
    This is irrespective of the sampling rate because, this happened even when we did continuous sampling at low scan rates of 10 to 100 samples /sec
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    Disable Simultaneous sampling and hold for the SCXI 1520 module ( using a DAQmx property node)
    Use a M series DAQcard, which did not have this settling time problem
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  • Applying Excitation Load to the SCXI-1520

    We use the SCXI-1520 signal conditioner to test and calibrate bridge sensors that we manufacture and it works great.  While the system is not used (i.e. when the operator connectes a sensor to the system) the SCXI-1520 is automatically isolated by using relays in a switching system.  The primary intent for this is to avoid possibly damaging the signal conditioner.  (Operators do regretful things.)   This means that the excitation power is floating with no load while the signal conditioner is disconnected,.  I was wondering if it would be appropriate to have the system automatically apply a load resistor to the excitation source to keep it "warmed up" so to speak.  Most sensors are a 350 ohm bridge and may be as high as 5000 ohms.  I was thinking of applying a common 330 ohm 1/2 watt resistor as a load.  (We are currently only using two channels at a time.)  Although I'm sure it would not make things worse, I just wonder if it's worth the bother.  Please advise...

    In my opinion, I don't think it is worth the trouble. The temperature
    of the SCXI-1520 probably won't change much from connecting a load to
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    SCXI-1520 to keep it at a stable temperature with or without the
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    ter cutoff freq, Voltage Exc, and Bridge Config. And from the LabVIEW help for AI Parameter, that these correspond to parameters 13,14, 17 and ?. Bridge Configuration is not listed. Which parameter is used to set this? Is there an example VI available?

    Hi Frank -
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    You can find the user manual for anything at ni.com/manuals.  The manual for the SCXI-1520 is currently here.
    If you're programming in LabVIEW, you can find example programs for this device in the Example Finder.  (Click Help » Find Examples to open it.)  I recommending filtering by your hardware.  To do so, click the Hardware list in the bottom-left of the window and select "Add device".  After adding the SCXI-1520, select it from the list and check the Limit results to hardware box.  This will filter our examples down to the ones that work with your device.  They'll probably all be in the "Hardware Input and Output » Analog Measurements » Strain" folder.
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  • Will Analog Instruments ADXL330 triaxial accelerometer work with the SCXI-1531 input module?

    I have an SCXI-1001 chassis and will soon be purchasing an accelerometer input module (SCXI-1531).  I'm also investigating possible accelerometers to buy.  Does anyone know if the the Analog Instruments ADXL330 accelerometer can be made to work with the SCXI-1531?  Here is a link to the Analog Instrument's page about the device:
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    Hello,
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  • What is the combined effect of the SCXI-1520 Gain and NI-Max Gain?

    LabVIEW 6.1
    SCXI-1000
    SCXI-1520
    SCXI-1314
    PCI-6031E
    Windows 2000
    Greetings-
    I'm trying to determine how the gain that is settable on a given channel of an SCXI-1520 module is combined with the gain that NI Max assigns to a Virtual Channel.
    For example, if you set a gain of 100 on ch0 of an SCXI-1520, and you then create a Virtual Channel to read the mV output of the Ch0 sensor, (in this case a full bridge load cell), should the AI limits (range) that you specify in the Virtual Channel creation reflect the gain of 100 that the 1520 module is already applying to the signal? And after the 1520 module applies it's gain, does NI Max attempt to apply another gain if there is still capacity to amplify the signal within the AI range of the daq device?
    Also, when measuring a full bridge sensor as an analog input voltage signal, and after performing a Null on the sensor, there is usually some residual offset. Does one then programmatically (in LabVIEW) tare, or zero this residual offset by subtracting its value from all subsequent measurements?
    Thanks for your help.

    Hello Steve,
    How are you applying gain if not through a virtual channel?
    When you set the input signal ranges in MAX for your virtual channel, SCXI and DAQ board gains are applied. For example, if you create a voltage channel to read the mV output of a sensor, and set the range to +/- 10mV, the SCXI Module would apply a gain of 1000 to the signal and send the resulting +/-10V to the MIO DAQ device. The DAQ device will then attenuate this signal to +/-5V (the range of the ADC) by applying a gain of 0.5. Now, if you set the input signal range to +/-1mV, the SCXI Module will apply its maximum gain of 1000 and send the resulting +/-1V to the MIO device. The DAQ device will then amplify this signal to +/-5V by applying a gain of 5.
    If you are still seeing a residual offset after null calibration, you should use the Auto Zero property. This property measures ground before an acquisition and then subtracts that value from every subsequent measurement. You can set this in a strain task, or with a Channel Property Node in LabVIEW.
    Let me know if you have any further questions.
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    I am taking these measurments using the measurment and automation explorer test function. I set my range on all channels to 0-8khz and Have been inputing no more than 8khz. What leads me to believe I have a software or config problem is that I sent in a module to NI for repair and this is the brand new one they sent me back. While testing this module, I also have a 1102 module and 1124 module on the scxi-1000 chasis and both of those are working as specified. I also moved the 1126 module to slot 1 and ran it that way as well when I replaced the chasis.

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