![background image](http://html2.mh-extra.com/html/national-instruments/pxie-5665/pxie-5665_calibration-manual_3612098046.webp)
46
|
ni.com
|
PXIe-5665 Calibration Procedure
10. Configure the RF Source 2 according to the following settings:
•
Center frequency: PXIe-5665 center frequency
•
Output power:
RF Source Power through Splitter
for that frequency
11. Set the spectrum analyzer center frequency to the RF source 2 frequency.
12. Set the PXIe-5665 span and resolution bandwidth according to the first row in Table 24.
13. Set the spectrum analyzer span, resolution bandwidth, and number of averages according
to the values in Table 24.
14. Commit the PXIe-5665 settings to hardware.
15. Wait 250 ms before making the first measurement and wait 100 ms before making a
subsequent measurements to allow the PXIe-5665 and RF source 2 amplitudes to settle.
Note
Settling times are a characteristic of the RF source device. Refer to the
section of this document for a list of NI-recommended source devices and
device specifications. If you use an RF source device with different device
specifications, your settling times may differ from those listed in this procedure.
16. Measure the RF source 2 spectrum with the spectrum analyzer.
17. Perform a peak search on the spectrum from step 16. The value of the peak is the
Spectrum
Analyzer Tone Power
. This value is used in step 19(c).
Table 24.
LO-Related Spurs Verification Bandwidth and Span Settings
PXIe-5665
Span
PXIe-5665
RBW
PXIe-5665 Notch BW
(Number of Bins at
Stated RBW)
Spectrum
Analyzer
Span
Spectrum
Analyzer
RBW
Spectrum
Analyzer
Averages
200 kHz
10 Hz
20 kHz (1999)
600 Hz
50 Hz
6
2 MHz
40 Hz
200 kHz (4999)
300 Hz
50 Hz
3
20 MHz
60 Hz
2 MHz (33333)
300 Hz
50 Hz
3