HP 83447A, Руководство пользователя и сервисное руководство

Страница: 73 / 102

Servicing the HP 83447A
P erformance T ests
10. The electrical channel should be enabled and the optical channel
disabled.
11. Set the optical power into the HP 83447A to 015 dBm.
12. Turn on the color grade measurements on the digital communications
analyzer by selecting
NNNNNNNNNNNNNNNNNNNNNNN
Display ,
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
Color Grade ON
13. Using the V amptd measurement on the digital communications analyzer ,
measure the eye amplitude on the electrical channel (Trigger out). It
should be above 0.4 vpp (average low-to-average high).
14. Place the vertical cursors at the eye mid-point, and accumulate at least
10,000 samples . Record the following:
at wavelength 1310 nm:
Optical P ower (0 15.0 dBm, 6 1 dB)
T rigger amplitude (must be > 400 mV
p-p
)
at wavelength 1550 nm:
Optical P ower (0 15.0 dBm, 6 1 dB)
T rigger amplitude (must be > 400 mV
p-p
)
15. Reduce the optical power to 020 dBm.
16. Measure the eye amplitude and record the following:
at wavelength 1310 nm:
Optical power
T rigger e ye amplitude (must be > 200 mV
p-p
)
at wavelength 1550 nm:
Optical power
T rigger e ye amplitude (must be > 200 mV
p-p
)
4-19