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NI PXIe-5693 Calibration Procedure
12. Set the NI 5693 center frequency to the start frequency in Table 16.
13. Set the RF Source 1 frequency to the first start frequency in Table 16.
14. Commit the NI 5693 settings to hardware.
15. Set the RF source 1 power level using the following equation:
RF Source 1 Power Level
= -25 dBm +
RF Source through Splitter Path Loss
A_OUT
16. Measure the NI 5693 RF IN power by reading the channel B power using the appropriate
calibration factor for the power sensor frequency.
17. Read the power meter channel A power using the appropriate calibration factor for the
power sensor frequency.
18. Calculate the gain using the following equation:
Gain
= (
Channel A Power
+
Splitter Balance and 6 dB Attenuator Path Loss
A_OUT
) -
Channel B Power
19. Repeat steps 12 through 18 for all remaining frequencies described by Table 16.
20. Turn off the RF source 1 output.
21. Configure the power meter to read only channel A.
22. Set the NI 5693 center frequency to the first frequency listed in Table 16.
23. Set the NI 5693 RF preselector cal tone mode to low band RF or high band RF, according
to Table 16.
24. Commit the NI 5693 settings to hardware.
25. Measure the NI 5693 cal tone output power by reading the channel A power using the
appropriate calibration factor for the power sensor frequency.
26. Read the cal tone power referred to RF IN value from the NI 5693.
27. Calculate the calibration signal amplitude accuracy using the following equation:
Calibration Signal Amplitude Accuracy
=
Cal Tone Power Referred to RF IN
-
((
Channel A Power
+
Splitter Balance and 6 dB Attenuator Path Loss
A_OUT
) -
Gain)
28. Repeat steps 22 through 27 for all the remaining frequencies described by Table 16.
Table 16.
Calibration Signal Amplitude Accuracy Verification Test Frequencies
Start Frequency
(MHz)
Stop Frequency
(MHz)
Frequency
Step Size
(MHz)
RF Preselector Cal
Tone Mode
34.5
138
2
Low Band RF
140
550
5
Low Band RF
575
950
25
Low Band RF
975
7,000
25
High Band RF
