Agilent Technologies 8719D User Manual page 632

Non-Volatile Memory
This is CMOS read/write memory that is protected by a battery to provide storage of data when
line power to the instrument is turned off. With this battery protection, data can be retained in
memory for ~250 days at 70° C and for ~10 years at 25O C (characteristically).
Non-volatile memory consists of a block of user-allocated memory and a block of fixed memory.
The user-allocated memory is available for you to save the following data:
instrument states
n
measurement calibration data
n
power meter calibration data
n
user calibration kit definitions
n
memory traces
n
user preset
n
Note
Even though calibration data is stored in non-volatile memory, if the associated
instrument state is not saved, you will not be able to retrieve the calibration
data after a power cycle.
The fixed memory is used to store the following data (you cannot change where this data is
stored and it does not affect your memory availability for storing user-allocated data):
HP-IB addresses
n
copy configuration (printer and plotter type, port, baud rate, handshake)
n
power meter type (HP 436/438)
n
display colors
n
sequence titles
n
sixth sequence
n
power sensor calibration factors and loss tables
n
user-defined calibration kits
n
system ZO
n
factory preset
n
HP-IB configuration
n
display intensity default
n
The maximum number of instrument states, calibrations, and memory traces that can reside in
non-volatile memory at any one time is limited to 31 instrument states, 128 calibrations
(4 per instrument state, including the present instrument state), and 64 memory traces
(2 per instrument state, including the present instrument state).
In addition, the number of instrument states and associated calibrations and memory traces are
limited by the available memory. 'lb display the amount of unused memory on the analyzer,
press @G$GGii). (Be sure you have selected r~~'~'~~~~~ as your disk type.) In the
upper righthand portion of the display, the value displayed as Bytes free : is the unused
non-volatile memory. When you save to the internal memory, you will see the number of bytes
free decrease. When you delete flies, the number of bytes free increases. There is a maxhum
Preset State and Memory Allocation