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Remote Operation
Normalizing the Measurement
Normalizing the Measurement
It is very important to normalize your test setup in order to make accurate
measurements. Normalization removes amplitude changes caused by your test
setup and provides a known reference for comparison. This assures that mea-
surement results reflect only the characteristics of your device. Because TLS
power varies with the wavelength span, normalization also improves the
amplitude accuracy of the WDCA. This is accomplished by adjusting the TLS
power based on the specified normalization start and stop wavelengths. This
power will remain unchanged until another normalization is performed over a
different wavelength span.
N o t e
Normalization data is valid only for the sweep mode used during normalization.
For example, if Normal Sweep Mode is the active sweep mode during
normalization, the normalized data will be valid only for normal sweep mode.
It is recommended that you perform a normalization every 8 hours.
Tip: The normalized wavelength range is independent of the displayed mea-
surement wavelength range. This allows you to calibrate a wider wavelength
range and then perform a measurement on a subset of the normalized range.
However, if the wavelength range selected extends outside the normalized
wavelength range, only the normalized portion of the trace will be displayed
accurately.
The full normalization commands
The normalization arrays do not necessarily line up with the current sweep.
You are allowed to configure a large normalization span and let the WDCA
interpolate to the currently measured span. If the measurement wavelength
span extends beyond the normalization span, wavelengths less than the nor-
malization span will use the first wavelength normalization point and wave-
lengths greater than the normalization span will use the last normalization
point.
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