NI PXI-5600 Calibration Procedure 20 ni.com
7. Repeat steps 4 through 6 for the remaining calibration iterations,
changing the signal generator amplitude and the NI PXI-5600
attenuation parameters for each iteration as shown in Table 7.
8. Call
niTuner_CalCloseExternalCalibration to end the
calibration session. Set action to
0 to commit your changes, or to 1 if
you want to cancel without saving.
Adjusting RF Frequency Response
To adjust the RF frequency response, write a program that includes the
following steps:
1. Call
niTuner_CalInitializeExternalCalibration to open
the calibration session.
2. Call
niTuner_CalSetClockSource and set the clock source to
internal.
3. Set channel A on the power meter to read 15 MHz.
4. Set the signal generator amplitude as shown in Table 8 for the first
calibration iteration.
5. Call
niTuner_CalSetAttenuation and set the RF signal
attenuation to the Reference Level and Mixer Level listed in Table 8
for the current iteration.
6. Loop 277 times. Include the following steps in each loop:
a. Call
niTuner_CalGetStepFrequency with the following
inputs:
• startFrequency =
20 MHz (in terms of Hz)
• stopFrequency =
2.78 GHz (in terms of Hz)
Table 8. RF Adjustment Settings
Calibration
Iteration
Signal Generator
Amplitude
NI PXI-5600
Parameters
Reference
Level
Mixer
Level
1 –24 dBm –30 dBm –30 dBm
2 –14 dBm –20 dBm –30 dBm
3 –4 dBm –10 dBm –30 dBm
4 6 dBm 0 dBm –30 dBm
5 16 dBm 10 dBm –30 dBm
6 16 dBm 20 dBm –30 dBm
