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Keysight N4372E Lightwave Component Analyzer User’s Guide
4
Making Measurements
Starting the Lightwave Component Analyzer
1 Turn on the network analyzer and the LCA Test Set Controller.
2 Allow the LCA Test Set Controller to warm up. Both the LCA Test Set
Controller and the network analyzer need to stabilize their internal
temperature for at least 60 minutes after the LCA software has been
started.
3 If it did not start automatically, click on the icon on the desktop to start
the network analyzer application.
4 If it is not already running, start the LCA server by pressing
,
or by clicking the LCA server icon on the desktop. See
on page 78 for information on displaying the LCA
function keys.
Calibrating the Network Analyzer before Measurements
About measurements
• Always make sure that, “Stepped sweep - sweep moves in discrete
steps” is selected in the sweep setup menu on the network analyzer.
• To get the best S/N ratio for your measurements, use the highest RF
power your network analyzer can output without showing a “source
unlevelled” error. This can be more than 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.
It is recommended to use an IF bandwidth of 5 kHz or narrower.
• Apply appropriate averaging or smoothing for your application.
• Always perform an electrical calibration of the network analyzer or load
an existing calibration set before making measurements.
• Before starting the electrical calibration of the network analyzer, make
sure that the LCA is in EE measurement mode.
• For electrical calibration use the default RF power for EE measurement
mode.
• After completing the electrical calibration, do not alter the IF
bandwidth, start frequency, stop frequency, measurement point
number or other settings. You may get measurement errors if you
change any of those parameters.
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