cDAQ-9172 Calibration Procedure

[MarkMoss]

Is there an official calibration/verification procedure available for the cDAQ-9172 chassis?  I haven't been able to find one on the NI website.

Specifically, I want to verify the accuracy of the timing functions provided by the USB-STC2 timing engine in the chassis.

Thanks in advance,

Mark Moss

Electrical Validation Engineer

GHSP

[Wallace_F]

Hello Mark,

Unfortunately, there is no calibration procedure for the cDAQ-9172 chassis. In fact, National Instruments offers no calibration services for the cDAQ-9172 chassis.  I'm just guessing here, but I think that the reason is because the only thing that is really in the chassis are analog input and output timing engines, and signal routing lines.  I can tell you that the analog input and output timing functions are specified at 50 parts per million of the sampling rate.  The base clocks for the counters/timers are also spec'd at 50 ppm. If you want to check to see how accurate the clocks are, you would need to have an oscilloscope and a clock signal of known accuracy, and you would have to route the timing signal to a PFI line or other signal line that was accessible externally.  You would then have to trigger the clock signal of known accuracy and the cDAQ-9172 timing signal at the same time, and measure the difference. For more information on calibration of National Instruments products, I recommend that you view the Calibration FAQs on the NI website.

Best wishes,

Wallace F.

[Ader_the_mumu]

Dear Sir,

I planned to use the products NI USB 9217 and the chassis cDAQ 9174 for temperature measurements with pt100 sensors. Should I follow the calibration procedure for the NI USB 9217, or is it already calibrated when I bought it ? 

Thanks for your answer

[Sean_F]

Hey Ader,

The device should have been calibrated before it was shipped to you. To see when it was calibrated last, open Measurement & Automation Explorer (MAX) and find your device under Devices and Interfaces. At the bottom of the windows you should see three tabs: Attributes, Device Routes, and Calibration. The Calibration tab will let you know when it was last externally calibrated and when it should be recalibrated. 

Regards,

[John_P1]

Additionally, you can look up the calibration certificate here, which should include the Calibration Date and recommended Calibration Interval.

Best Regards,