PXIe-5673 Calibration Procedure
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© National Instruments
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17
Note
To maintain the same measurement uncertainty as the power meter, you must
apply the corrections found in step 15 to the measured results as shown in the
following equation:
AdjustedMeasurement [i] = SpecAn [i] + Corrections [i] + Splitter Loss [i]
15. Set the niRFSG Power Level property to
-90
dBm and repeat steps 8 through 10 using only
the spectrum analyzer and its measured correction to measure the power accuracy using the
following spectrum analyzer parameter settings:
•
Center frequency: (Frequency in step 8) + 1 MHz
•
Reference level: -30 dBm
•
Frequency span: 0 Hz
•
Resolution bandwidth: 500 Hz
•
Sweep time: 200 ms
•
Reference clock source: External
•
Attenuation: 5 dB
•
Preamplifier: On
16. Measure tone power with the spectrum analyzer and calculate the adjusted tone power
using the
AdjustedMeasurement [i]
equation from step 14.
17. Compare the measured values from steps 8 through 15 to the corresponding limits in
Table 7.
If the results are within the selected test limit, the device has passed this portion of the
verification.
Table 7.
Output Power Level Accuracy Verification Test Limits
Output Power (dBm)
As-Found Limit (dB)
As-Left Limit (dB)
5
±0.75
±0.55
0
±0.75
±0.55
-10
±0.75
±0.55
-30
±0.75
±0.55
-60
±0.75
±0.55
-90
±0.75
±0.55
