HP HP 83491A, User Manual, Page: 17 / 62

2-3
Operation
HP 83491/2/3A Modules—at a glance
W A R N I N G Light energy can radiate from the front panel Output connectors on
HP 83492A and HP 83493A modules. The light emitted from these
connectors is the slightly attenuated light that is input to the front-
panel
Input connector.
Use with HP 71603B or HP 71612B Error Performance Analyzers
The front-panel
Data
and
Clock
outputs provide electrical recovered clock and
regenerated data signals for simultaneous testing with other instruments,
such as the HP 71603B or HP 71612B error performance analyzers.
Multimode module and single-mode reference receivers
HP does not recommend using the HP 83492A multimode module with single-
mode reference receivers such as the HP 83481A, HP 83482A, or
HP 83485A,B modules. Connecting multimode to single-mode fibers causes
large reflections and insertion loss because of the reduction of the optical
fiber’s core from 62.5
µ
m to 9
µ
m.
Single-mode module and multimode reference receivers
It is acceptable to use an HP 83493A single-mode module with a multimode
reference receiver such as the HP 83486A module. This is true provided that
single-mode fiber is connected to the HP 83493A module’s front-panel
Input
connector.
What you won’t find on these modules . . .
Unlike other modules designed to be used with the HP 83480A digital communications
analyzer, the HP 83491/2/3A modules do not include Channel keys or menus. Also, there
are no GPIB programming commands for these modules.