24
|
ni.com
|
PXIe-5673 Calibration Procedure
3.
Connect the PXIe-5450 CLK OUT front panel connector to the PXI-5650/5651/5652
REF IN/OUT front panel connector.
4.
Connect any available rubidium frequency reference rear panel BNC connector to the
spectrum analyzer REF IN rear panel connector through the BNC(m)-to-BNC(m) cable.
5.
Generate a single-sideband tone with a +1 MHz offset from the carrier signal with the
following niRFSG property settings:
•
Frequency (Hz): 85 MHz
•
Power Level (dBm): 0 dBm
•
Generation Mode: Arb Waveform
•
Reference Clock Source: ClkIn
6.
Use the spectrum analyzer to measure the mean RF output using the following spectrum
analyzer parameter settings (name this measurement
RF
):
•
Center frequency: (Frequency in step 5) + 1 MHz
•
Reference level: +5 dBm
•
Frequency span: 0 Hz
•
Resolution bandwidth: 500 Hz
•
Sweep time: 5 ms
•
Reference clock source: External
7.
Use the spectrum analyzer to measure the baseband linearity-related spur using the
following spectrum analyzer parameter settings (name this measurement
B
):
•
Center frequency: (Frequency in step 5) - 3 MHz
•
Reference level: +5 dBm
•
Frequency span: 0 Hz
•
Resolution bandwidth: 500 Hz
•
Sweep time: 5 ms
•
Reference clock source: External
8.
Calculate the power level of the baseband linearity-related spur in dBc by subtracting the
measured RF output power from step 6 from the measured baseband linearity-related spur
from step 7, as shown in the following equation:
P
baseband
=
B
-
RF
9.
Compare the value calculated in step 8 to the corresponding limits in Table 12.
10. Repeat steps 5 through 9 for the following frequency ranges in 200 MHz increments,
including endpoints:
•
PXI-5650: 85 MHz to 1.3 GHz
•
PXI-5651: 85 MHz to 3.3 GHz
•
PXI-5652: 85 MHz to 6.6 GHz
Store the resulting measurements.
