![background image](http://html2.mh-extra.com/html/national-instruments/pxie-5665/pxie-5665_calibration-manual_3612098030.webp)
30
|
ni.com
|
PXIe-5665 Calibration Procedure
7.
Set the PXIe-5665 reference level using the following values:
•
Start power: -50 dBm
•
Stop power: -10 dBm
8.
Set the PXIe-5665 center frequency and the RF source 2 frequency according to the first
row in Table 10.
9.
Set the RF source 2 amplitude for that RF source 2 frequency using the following equation:
RF Source 2 Amplitude = PXIe-5665 Reference Level +
RF Source to DUT through Attenuator Path Loss
10. Commit the PXIe-5665 settings to hardware.
11. Take five readings of the RF source 2 amplitude using power sensor A. Calculate the
average power.
12. Repeat step 11 until any two readings measured differ no more than 0.02 dB and no
two averages differ by more than 0.005 dB. This average is the
Measured Average Power
.
Note
More than 30 averages total indicate a test failure that you must diagnose.
13. Calculate the
Corrected Input Power
using the following formula:
Corrected Input Power = Measured Average Power -
DUT to Power Meter through Attenuator Path Loss
Note
The
RF Source to DUT through Attenuator Path
and
DUT to Power Meter
through Attenuator Path Loss
values were measured in the
Source Power (with Splitter and Attenuator)
equipment characterization procedure.
Use the values that correspond to the frequency range you are testing.
14. Read the PXIe-5665 power spectrum. The
PXIe-5665 Power
is the peak value of that
spectrum.
Table 10.
Frequency Response and Absolute Amplitude Accuracy Verification
(Frequencies >10 MHz) Test Frequencies
Start Frequency
Stop Frequency
Step Size
10 MHz
*
100 MHz
30 MHz
200 MHz
600 MHz
200 MHz
612.5 MHz
—
—
800 MHz
3.6 GHz
400 MHz
4 GHz
14 GHz
500 MHz
*
The 10 MHz to 100 MHz frequency range applied only to the 300 kHz device instantaneous
bandwidth value.