HP 70310A, Руководство по установке и проверке

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Checking Module Operation
The HP 70310A Precision Frequency Reference can be congured as a separate frequency
reference (installed in an HP 70000 Modular Measurement System mainframe) or as a slave in
an HP 70000 Modular Measurement System. Module-operation checks are given below for the
following congurations:
HP 70310A module used as a separate frequency reference .
HP 70310A module used as a slave in an HP 70000 Modular Measurement System that has an
HP 70900A Local Oscillator as the system master .
HP 70310A as a Separate Frequency Reference
The operation of the HP 70310A module as a separate frequency reference is veried by
checking the results of the module's power-on self-test.
The results of the self-test can be determined by examining the status of the module's LEDs .
An HP 70000 Modular Measurement System display can also be used to check for error
messages .
Front-P anel LEDs
The power-on self-test runs automatically when power is rst applied to the module . The
listing below describes what the status of the LEDs should be immediately after the self-test
has run.
The A CT LED should be o.
The ERR LED should be on if the oven/oscillator is still cold. The ERR LED may stay
on when the O VEN COLD LED goes o. If this happens , cycling the power (turning the
mainframe o, then quickly turning it on again) should result in the ERR LED going o. HP
70310A Option 002 modules should not have the ERR LED go on.
The O VEN COLD LED should be on if the oven/oscillator is still cold. This LED should go o
approximately fteen minutes after power-on if the module was stored at room temperature .
HP 70310A Option 002 modules should not have the O VEN COLD LED go on.
The EXTERNAL REF LED should be o if the internal frequency reference is being used.
The EXTERNAL REF LED should go on when an appropriate external reference is connected
to the HP 70310A module .
The PLL ERROR LED should be o.
Checking for Error Messages
If the HP 70310A module's ERR LED remains on, an HP 70000 Modular Measurement System
display can be used to determine what error is occurring.
Note
Remove all master elements or systems from the HP-MSIB before using the
following troubleshooting procedure . If there are any master elements or
systems on the HP-MSIB when this procedure is performed, the system or
master may cease communication and the procedure may not work.
Installation 2-11