Keysight Technologies N4373D, User Manual

Page: 87 / 176

Making Measurements
Keysight
N4373D Lightwave Component Analyzer, User’s Guide 85
Calibrating the Network Analyzer before Measurements
About measurements
Please refer to “Optimize a measurement” and “Calibrate a
measurement” in the documentation for the network analyzer.
• Always perform an electrical calibration of the network
analyzer or load an existing calibration set before making
measurements.
• Always make sure that, on the network analyzer, in the sweep
setup menu, that “Stepped sweep - sweep moves in discrete
steps” is selected.
• After completing the calibration, do not alter the test port
power, IF bandwidth, start frequency, stop frequency,
measurement point number or other settings.

You may get measurement errors if you change the
parameters.
Keep the following points in mind during network analyzer
electrical calibration.
• To get the best S/N ratio for your measurements, use highest
RF power your network analyzer can output without showing
a “source unlevelled” error. In many case this is more then
the maximum specified output power of the network
analyzer.
• Decreasing the IF bandwidth improves the S/N ratio of the
measurement. However, doing so increases the calibration
and measurement times, so a suitable IF bandwidth should
be selected.
• Apply appropriate averaging or smoothing for your
application.
Electrical calibration for single-ended measurements
To ensure the specified performance of the LCA, you need to
perform a full two-port electrical calibration using the
automated electronic calibration kit N4694A #00F or N4694A
#00A.
N O T E
When in EO, OE or OO measurement mode, you need to return to EE
measurement mode first before you can perform an electrical calibration