NI PXI 5610 procedure in Cal Executive

I am currently working with the calibration executive software version 3.3 to calibrate some PXI-5610 cards. For the AmplitudeAccuracy_Super10MHz it has me manually input two measurements. In turn it appears to perform a calculation to determine the As found dB reading on the calibration report. However, I cannot seem to understand why two measurements are made and why the calculations appear inconsistent. For the same test at frequencies from 20MHz to 2.7GHz with a power level of -50dBm I input similar numbers for both values on all frequencies but received vastly different values.
Here is a specific example:
1005MHz @ -50dBm 256average 1st value: -50.54dBm 2nd value: -65.17 As found reading on report: -.5837
1500MHz @ -50dBm 256average 1st value: -50.67dBm 2nd value: -65.12 As found reading on report: -.8231
Does anyone know what the calculations are for this procedure and why/what I might be doing incorrectly to make my measurements inconsistent?

Hi Jerimiah,
I am taking a look into your question and I wanted to clarify a few things. What hardware are you using to make the measurements? Is it the recommended hardware or an unsupported model? Could you provide a screenshot of a couple rows of the AmplitudeAccuracy_Super10MHz section of the calibration report if you have it? It would also be helpful to have a screenshot of the prompts to enter the two measurements. I am not sure of the calculation that is made based on your inputs, however I suspect the difference may be related to the passband flatness. Let me know what other information you can provide and I will continue looking into an answer.
Steve B

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Agilent E4418B
Frequency Range: 9 kHz to 110 GHz
Power Measurement Range: –70 dBm to 44 dBm
Maximum VSWR: ?
Absolute Power Measurement Uncertainty:?
Relative Power Measurement Uncertainty: ?
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Frequency Range: 900 kHz to 820 MHz
Power Measurement Range: –4 dBm to 3 dBm
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pxi 5610.jpg ‏124 KB

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