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Using the Analyzer
Measurement Techniques
Measuring the Bandwidth of a Filter
The filter's bandwidth may be measured at -3 dB, -6 dB, -10 dB, -20 dB, or set
to the value required for your filter's specification.
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 From the front panel, press Markers > Peak Search to find the highest peak
in the displayed response.
2 Press More Marker Functions > Marker BW On > – 3 dB to measure the
3 dB bandwidth point of the peak.
The measurement results are displayed at the top of the screen.
• Mkr 1 shows the peak wavelength and amplitude.
• Mkr 1L displays the rising edge of the 3 dB wavelength and amplitude.
• Mkr 1R displays the falling edge of the 3 dB wavelength and amplitude.
• BW displays the 3 dB wavelength width of the response.
• CWL displays the center wavelength of the 3 dB response. This is computed
by adding the rising and falling edges, 3 dB wavelengths and dividing by 2.
3-22
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