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Using Trace Math to Measure Wavelength Drift
This procedure assumes that you have normalized your test setup and posi-
tioned the response on the display. For more information on these processes,
refer to "Normalizing the Measurement" on page 3-11 and refer to "Status
Reporting for Laser Wavelength Zeroing" on page 3-13.
1 Setup your device so that you can view the response on the display.
2 From the front panel, press Traces > Active Trace > TrA.
3 Press Single Sweep to update Trace A then press Update A off.
4 Press Active Trace > TrB.
5 Press Sweep > Repeat Sweep On to continuously update the measured
response on Trace B.
6 Press Traces > Trace Math Off > Default Math Trace C >
Log Math C = A – B.
You can now monitor the wavelength drift of your DUT over time.
Figure 3-17. Top trace shows wavelength drift over time
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Using the Analyzer
Measurement Techniques
3-41
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