16
|
ni.com
|
NI PXI-5663 Calibration Procedure
or set the following attributes:
•
NIRFSA_ATTR_SPECTRUM_AVERAGING_MODE
to
NIRFSA_VAL_RMS_AVERAGING
•
NIRFSA_ATTR_SPECTRUM_NUMBER_OF_AVERAGES
to 20
•
NIRFSA_ATTR_RESOLUTION_BANDWIDTH_TYPE
to
NIRFSA_VAL_RBW_ENBW
•
NIRFSA_ATTR_POWER_SPECTRUM_UNITS
to
NIRFSA_VAL_VOLTS_SQUARED
11. Commit the settings to hardware using the niRFSA Commit VI or the
niRFSA_Commit
function.
12. Set the NI 5663 to read the power spectrum using the niRFSA Read Power Spectrum
(Cluster) VI or the
niRFSA_ReadPowerSpectrumF64
function.
13. Get the spectrum information using the niRFSA Get Spectral Info for SMT VI or the
niRFSA_GetSpectralInfoForSMT
function.
14. Set the following properties or attributes using the SMT Spectrum Unit Conversion VI or
the
SmtSpectrumUnitConversion
function:
•
units
to
dBm
•
peak scaling
to
RMS
•
psd?
(or
psdOnOff
) to TRUE
•
impedance
to
50
15. Calculate the mean value of the spectrum. This value is the
NI 5663 Average Noise Level
.
16. Compare the
NI 5663 Average Noise Level
to the test limits in Table 8.
17. Repeat steps 6 to 16 for all combinations of settings in Tables 6 and 7.
18. Close the NI 5663 session using the niRFSA Close VI or the
niRFSA_close
function.
If the results are within the selected test limit, the device has passed this portion of the
verification.
Table 8.
Average Noise Level Verification Test Limits
Frequency
As-Found Limit
As-Left Limit
10 MHz to <30 MHz
<-155 dBm/Hz
<-156 dBm/Hz
30 MHz to <120 MHz
<-159 dBm/Hz
<-160 dBm/Hz
120 MHz to <3 GHz
<-155 dBm/Hz
<-156 dBm/Hz
3 GHz to <5 GHz
<-153 dBm/Hz
<-154 dBm/Hz
5 GHz to 6.6 GHz
<-151 dBm/Hz
<-152 dBm/Hz