•
When there is a change to the system cabling
•
When the system is in an environment where external variables, such as temperature, can
affect measurements
You should also perform a self-calibration if your device has exceeded any of the following
temperature or time limits since the last device self-calibration:
•
IF flatness: ±5 °C and/or 7 days
•
Gain reference: ±5 °C and/or 7 days
•
LO self-calibration: ±10 °C and/or 30 days
•
Preselector alignment: ±5 °C and/or 7 days
Performing a Device Self-Calibration Using the
NI-RFSA SFP
NI recommends you run the self-calibration from the NI-RFSA SFP. You can also run a self-
calibration programmatically using the NI-RFSA API.
1.
Launch the NI-RFSA SFP by navigating to
Start
»
All Programs
»
National
Instruments
»
NI-RFSA
»
NI-RFSA Soft Front Panel
.
2.
Click
Device/System
»
Calibration
»
Self Calibration
.
3.
Select the self-calibration steps you want to perform from the
Self-Calibration
dialog
box.
4.
Click
Next
to run the self-calibration.
Locating the Software and Examples
Software Locations
Table 12. Locations of NI-RFmx Software
ADE
Location
LabVIEW
Available on the LabVIEW Functions palette at
Measurement
I/O
»
NI-RFmx
.
LabWindows/CVI
NI-RFmx functions are available from the LabWindows/CVI
Library
menu at
Library
»
RFmx SpecAn Library
and
Library
»
RFmx Demod Library
.
24
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ni.com
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PXIe-5668 Getting Started Guide
