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Making Measurements on the PNA
Starting the Lightwave Component Analyzer on the PNA
Calibrating the network analyzer before measurements
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1 Turn on the network analyzer and the optical test set.
2 Allow the Lightwave Component Analyzer to warm up,
that is until the LEDs for "LD Temp Ready" and "PD
Temp Ready" are lighting.
3 Turn on the laser by turning the key to the upright
position.
The "On" LED lights to indicate the laser is on.
4 If your Lightwave Component Analyzer has more than one
wavelength, select the wavelength at which you want to
measure by pressing the button under the Wavelength
LEDs.
About measurements
• Always perform an electrical calibration of the network
analyzer or load an existing calibration file before making
measurements.
If you make a measurement without a calibration, you will
get an error message.
• Make a note of the channel for which you make the
electrical calibration.
Always use this channel when setting up and making the
optical, electro- optical and opto- electrical measurements.
• 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 improve the S/N ratio of measurements, increase the
power of the network analyzer test port, though not so
high as to cause distortion in E/O converter modulation
characteristics.
• 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.
Agilent N4373A Lightwave Component Analyzer, First Edition
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