HP 70310A, Руководство по установке и проверке

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A ccessories
The HP 70310A Precision Frequency Reference may be ordered separately or as part of a
precongured HP 70000 Modular Measurement System. Figure 1-2 shows the HP 70310A
module and the accessories that may be shipped with it.
Front and Rear-P anel F eatures
Figure 1-3 shows the HP 70310A module's front- and rear-panel features .
Front-P anel Status and Error LEDs
All 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. F or troubleshooting information, refer to Chapter
5.
A CT (A ctive) LED
The A CT LED lights when the module is activated by an HP 70000 Modular Measurement
System master (for example , HP 70900A).
ERR (Error) LED
The ERR LED lights when an error condition exists .
O VEN COLD LED
The O VEN COLD LED lights when the internal oven/oscillator assembly is not warmed up to
operating temperature . The O VEN COLD LED is not used in HP 70310A Option 002 modules
(internal oven/oscillator assembly deleted).
EXTERNAL REF (Reference) LED
The EXTERNAL REF LED lights when an appropriate external-reference signal is being
injected into the rear-panel EXT REF input.
PLL ERROR (Phase-Lock-Loop Error) LED
The PLL ERROR LED lights when the (internal or external) reference signal is either absent or
incorrect. An external-reference signal must be used with HP 70310A Option 002 modules .
Oscillator A djustment Door
The oscillator adjustment door is removed to allow the internal oven/oscillator to be calibrated.
General Information 1-5