Memory Areas; Working Data; Protected Data; Default Data - Agilent Technologies 83620A Service Manual

Memory Areas

he synthesizer has three memory areas reserved for calibration constants:

Working Data

Working data is the set of calibration constants accessed during normal
operation and contains the calibration information required for optimum
instrument performance. Working data is stored in RAM, and is maintained by
a 1 farad capacitor.

Protected Data

Protected data resides in EEPROM. his calibration data is essentially
the same as working data, but is not dependent on the capacitor. If the
synthesizer's checksum test fails, or if the capacitor becomes discharged and
working data is lost, the synthesizer copies protected data values into working
data RAM.
If the synthesizer is unplugged for a period greater than ve
Note
days, the capacitor will be completely discharged. After
reconnecting the synthesizer to line power, the capacitor will be
completely recharged after 24 hours.

Default Data

Default data resides in UVEPROM. his data di ers from working and
protected data in that it cannot be changed. his data represents a typical
synthesizer, and is not optimized for your instrument. he default calibration
constants are a starting point for calibration. he synthesizer will probably
meet speci cations. he synthesizer uses default data if a problem exists
not
in both working and protected data or if you select
calibration utility menu.
4-2 Calibration Constants
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