How do the limits in cal exec for vertical sensitivity of a 5911 relate to the vertical sensitivity spec (noise referred to input) in the 5911 user manual?
One of our 5911's came back from calibration and it failed 'Vertical Sensitivity" at...
Range = 20V
Sample Rate = 2.5MS/s
Reading: 145.119 dBfs/sqrt(Hz)
High Limit: 152.000 dBfs/sqrt(Hz)
and...
Range = 0.2V
Sample Rate = 1MS/s
Reading: 113.859 dBfs/sqrt(Hz)
High Limit: 128 dBfs/sqrt(Hz)
How do these limits relate to the "Vertical Sensitivity" (Input Ranges) on page A-3 on the NI PCI-5911 User Manual? http://www.ni.com/pdf/manuals/322150e.pdf For 20V the user manual spec is 174 dBfs/sqrt(Hz) and for 0.2V is the same 128 dBfs/sqrt(Hz).
How might this impact previous error calculations?
Thanks,
Darrow
Hi Darrow,
First I will link to the Manual Calibration Procedure and Specifications for this board for reference.
There are a couple of sources of noise on this module that need to be taken into account. One shown in the vertical sensitivity table which you have already referenced. This is amplifier noise density which is dependent on gain settings. The second is ADC noise density. This is dependent on sampling rate. These values can be found in the Dynamic Range section of the Specifications.
The two noise sources are uncorrelated, and depending on your combination of sample rate and range, one will typically dominate and can be used as an estimate. Otherwise you can obtain the RMS total through the root sum of squares method. This total is what is used in the calibration tests.
There is a VI that has been set up for calculating the noise-floor of the 5911. You can find it here if you wish to see an illustration of the calculation (check out the block diagram).
If your module is failing calibration for any reason, you cannot rely on it meeting the accuracy specifications. This specific type of failure will impact the dynamic range/noise floor of the board. Likely tens of dB that you have lost given the measurements you report. Small signal measurements will definitely be affected. I recommend repair or replacement to ensure the quality of future measurements.
Jennifer O.
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