Keysight Technologies N4374B, Руководство пользователя

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User Interface Reference
Keysight
N4374B Lightwave Component Analyzer, User’s Guide 65
External Input
This control, which overrides the default behavior of the
Lightwave Component Analyzer, is only enabled in Advanced
mode. The External Input is an optional extra for the Lightwave
Component Analyzer.
• Select to use a laser source connected to the external input
(on the rear of the optical test set.
• Deselect to use the laser source in the optical test set.
Optical Input
Select the input to which your device under test is connected.
• For input signals up to +7 dBm (calibrated up to +5 dBm),
use Input 1 .
• For input signals up to +17 dBm (calibrated up to +15 dBm),
use Input 2 .
User Calibration
Select the calibration data you want to use.
• None uses the factory calibration data only (no additional
user calibration data is used).
• Measure runs an extra calibration measurement step during
the measurement setup.
Before running the first measurement, you need to ensure
the instrument has a valid electrical calibration, as described
in “Calibrating the Network Analyzer before Measurements”
on page 75.
At the end of this calibration measurement, you can save the
calibration data.
This calibration is only used for the measurement setup for
which it is specified.
• Load prompts you to load data from a file saved as part of a
previous user calibration measurement.
Modulator Optimization
Select to how the modulator bias is to be optimized.
• Select “Once” to automatically optimize the modulator bias at
the first measurement after the measurement parameters
have been set.
This is sufficient for most measurements unless the tester is
subject to large changes in environmental conditions.