HP 83447A, User'S And Service Manual

Page: 78 / 102

Servicing the HP 83447A
P erformance T ests
9. A ccumulate 1000 samples and read the sigma (RMS). The limits specied
below include 7.6 psec RMS measurement system jitter:
at wavelength 1310 nm:
T otal RMS jitter at 2.5 Gbps (14.2 ps, max)
at wavelength 1550 nm:
T otal RMS jitter at 2.5 Gbps (14.2 ps, max)
10. Change the clock frequency to 1.0 GHz. Measure the jitter again, as
above:
at wavelength 1310 nm:
T otal RMS jitter at 1.0 Gbps (21.4 ps, max)
at wavelength 1550 nm:
T otal RMS jitter at 1.0 Gbps (21.4 ps, max)
11. Change the clock frequency to 622 MHz. Measure the jitter again, as
above:
at wavelength 1310 nm:
T otal RMS jitter at 622 Mbps (33.0 ps, max)
at wavelength 1550 nm:
T otal RMS jitter at 622 Mbps (33.0 ps, max)
4-24