Technical data

8-16
Preset State and Memory Allocation
Memory Allocation
If correction is on at the time of an external store, the calibration set is stored to disk. (Note that inactive
calibrations are not stored to disk.) When an instrument state is loaded into the analyzer from disk, the
stimulus and response parameters are restored first. If correction is on for the loaded state, the analyzer
will load a calibration set from disk that carries the same title as the one stored for the instrument state.
Conserving Memory
If you are concerned about conserving memory, either internal memory or external disk space, some of the
most memory-intensive operations include:
• two-port error correction
• interpolated error correction
• 1601 measurement points
• saving data arrays and graphics with the instrument state
Using Saved Calibration Sets
When you are saving to internal memory (CMOS, non-volatile memory), calibration sets are linked to the
instrument state and measurement parameter for which the calibration was done. Therefore a saved
calibration can be used for multiple instrument states as long as the measurement parameter, frequency
range, and number of points are the same. A full 2-port calibration is valid for any measurement with the
same frequency range and number of points. When an instrument state is deleted from memory, the
associated calibration set is also deleted if it is unused by any other state.
The following hints will help you avoid potential problems:
• If a measurement is saved with calibration and interpolated calibration on, it will be restored with
interpolated calibration on.
• A calibration stored from one instrument and recalled by a different one will be invalid. To ensure
maximum accuracy, always recalibrate in these circumstances.
• No record is kept in memory of the temperature when a calibration set was stored. Instrument
characteristics change as a function of temperature, and a calibration stored at one temperature may be
inaccurate if recalled and used at a different temperature. Refer to Chapter 1, “Specifications and
Regulatory Information”.