Description; Mhz Reference Adjustment - Ocxo - Agilent Technologies 8564EC Service Manual

Spectrum analyzers

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Manual Adjustment Procedures

7. 10 MHz Reference Adjustment — OCXO

. 10 MHz Reference Adjustment — OCXO

Assembly Adjusted

A21 OCXO assembly

Replacement oscillators are factory adjusted after a complete warmup

and after the speciﬁed aging rate has been achieved. Thus,

readjustment should typically not be necessary after oscillator

replacement and is generally not recommended.

Related Performance Test

10 MHz Reference Accuracy

Description

The frequency of the internal 10 MHz frequency reference is compared

to a known frequency standard and adjusted for minimum frequency

error. This procedure does not adjust the short-term stability or

long-term stability of the A21 10 MHz ovenized crystal oscillator

(OCXO). Stability is determined by the characteristics of the particular

oscillator and the environmental and warmup conditions to which it

has been recently exposed. The spectrum analyzer must be on

continuously for at least 24 hours immediately prior to oscillator

adjustment to allow both the temperature and frequency of the

oscillator to stabilize.

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