Agilent Technologies 83400 Series, User Manual, Page: 76 / 82

4-9
Performance Tests
Tests for Receivers
Figure 4-5. Dynamic accuracy test setup
6 Use the Agilent 8702D’s “Guided Setup” feature to begin an optical bandwidth
(transmission) test.
During the isolation calibration portion of the guided setup routine, temporari-
ly set the attenuator to 0 dB attenuation. Also, turn on averaging, and set its
value to 10 averages. After calibration, turn averaging off.
7 After completing the guided setup procedure, step the optical attenuator in
10 dB increments starting at 0 dB. At each step, adjust the Agilent 8702D’s
reference level as shown in the following list:
0 dB level: ref level = +20 dB
10 dB optical attenuation: ref level = 0 dB
20 dB optical attenuation: ref level = –20 dB
30 dB optical attenuation: ref level = –40 dB
40 dB optical attenuation: ref level = –60 dB
(1300 nm wavelength only)
Determine the maximum difference between the trace and the reference line
at each 10 dB increment. Compare the measured value with the specification
listed in
Chapter 3, “Specifications and Regulatory Information” . On the –40 dB
step, add 1% smoothing. Use up to 20 averages, if necessary.