NI PXI-5600 Calibration Procedure 18 ni.com
6. Set the following parameters on the spectrum analyzer:
• center frequency =
110 MHz (examine the 11
th
harmonic
of 10 MHz)
• span =
600 Hz
• RBW =
1Hz
• input level =
10 dBm
7. Set the spectrum analyzer to read the 10 MHz OUT of the
NI PXI-5600.
8. Call
niTuner_CalAdjustInternalReferenceFrequency with
the following inputs:
• frequency = the peak frequency read from the spectrum analyzer
in step 7 (in terms of Hz)
• accuracy =
0.55 Hz (in terms of Hz)
9. Repeat steps 7 and 8 until the done value returned by
niTuner_CalAdjustInternalReferenceFrequency
is
1 (or TRUE).
10. 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 IF Frequency Response
To adjust the IF 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. Call
niTuner_CalSetFrequency and set the frequency of the
NI PXI-5600 to 100 MHz.
4. Set the signal generator amplitude as shown in Table 7 for the first
calibration iteration.
5. Call
niTuner_CalSetAttentuation and set the RF signal
attenuation to the specified Reference Level and Mixer Level listed
in Table 7 for the current iteration.
