NI PXIe-5693 Calibration Procedure
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© National Instruments
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4.
Set the RF source 1 frequency according to the first row in Table 3.
5.
Set the RF source 1 power to 0 dBm.
6.
Measure the channel A power and the channel B power using the appropriate calibration
factor for the RF source 1 frequency.
7.
Calculate the splitter balance and 6 dB attenuator path loss and the RF source through
splitter path loss using the following equations:
Splitter Balance and 6 dB Attenuator Path Loss
A_OUT
= Channel B Power - Channel A Power
RF Source through Splitter Path Loss
A_OUT
= RF Source 1 Power (Direct)
A
- Channel A Power
8.
Repeat steps 4 through 7 for all remaining frequencies described by Table 3.
9.
Repeat steps 2 through 8 after swapping the power sensor A and power sensor B
connections.
10. Calculate the splitter balance and 6 dB attenuator path loss, and calculate the RF source
through splitter path loss using the following equations:
Splitter Balance and 6 dB Attenuator Path Loss
B_OUT
=
Channel A Power - Channel B Power
RF Source through Splitter Path Loss
B_OUT
= RF Source 1 Power (Direct)
B
- Channel B Power
Characterizing the RF Source Power (with Combiner,
Splitter, and 20 dB Attenuator)
Note
Zero and calibrate the power sensor using the procedure in the
section prior to starting this procedure.
1.
Connect the RF source 1 output to connector 1 of the low frequency power combiner using
the SMA (m)-to-SMA (m) cable.
2.
Connect the RF source 2 output to connector 2 of the low frequency power combiner using
the SMA (m)-to-SMA (m) cable.
Table 3.
RF Source Power (through Splitter and Attenuator)
Characterization Frequencies
Start Frequency
Stop Frequency
Step Size
10 MHz
100 MHz
10 MHz
100 MHz
187.5 MHz
87.5 MHz
190 MHz
199 MHz
9 MHz
200 MHz
612.5 MHz
100 MHz
700 MHz
3.6 GHz
100 MHz
3.6 GHz
7 GHz
200 MHz
