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Front- and Rear-Panel Features
Figures 1-2 and 1-3 show the HP 70907A/B front- and rear-panel features.
Status and Error LEDs
Both of the front-panel LEDs
ash on, then o again, during the module's self-test. Listed
below are the other reasons for each LED to light. For troubleshooting information, refer to
Chapter 5.
ACT The ACT (active) LED lights when the module has an active keyboard link to an
HP 70000 Modular Measurement System master and is being activated by that master.
If there is no display in the system, the ACT LED will not light even if the previous
requirements are met.
ERR The ERR (error) LED lights when an error condition exists.
Front-Panel Inputs and Outputs
PRESEL TUNE/SPAN This BNC (f) connector is only present in HP 70907B modules.
MIXER BIAS OUT
or MIXER BIAS
LO OUTPUT
IF INPUT
Module Latch
When the module is being installed in or removed from an HP 70000 Modular Measurement
System mainframe, an 8 mm hex-ball driver is used to turn the module latch.
1-6
General Information
This connector provides a dc voltage which drives the preselector in
the HP 11974 Series external mixer.
This SMA female connector provides the bias output for external
mixers that require bias.
This SMA female connector provides the LO signal required by the
external mixer.
This SMA female connector receives the input from the IF port of
the external mixer.
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