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Using the Analyzer
Measurement Techniques
Measurement Techniques
The WDCA is a stimulus response instrument that has a source (a TLS) and a
receiver that work together to measure passive components.
The TLS provides the input signal for the device under test (DUT) and con-
trols the sweep speed of the instrument. It is the primary contributor for the
critical specifications of resolution bandwidth, dynamic range, and wavelength
range.
Because the source is the primary contributor to the measurement speed, the
sweep speed is not user controlled, rather, sweep time is mostly affected by
the wavelength span setting. Other functions that affect the sweep speed are
the receiver's sensitivity setting and the selected sweep mode (Fast, Normal,
or Precision). The faster the TLS sweeps the less time for amplitude settling.
Normal Sweep Mode is a good choice for most measurement applications. Use
Precision Sweep Mode when a little extra amplitude accuracy is required. See
"Wavelength Specifications" on page 9-9.
To get the best accuracy from the WDCA, you need to normalize the source
and receiver with a patch cord (that is, thru cable) to obtain the best perfor-
mance.
The following procedures will show you how to use the WDCA to make timely,
accurate measurements of your DUT.
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