HP 8753E manual Conserving Memory, Using Saved Calibration Sets

Conserving Memory

If you are concerned about conserving memory, either internal memory or external disk space, some of the most memory-intensive operations include:

ntwo-port error correction

w interpolated error correction

n1601 measurement points

nusing time domain

w 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 S-parameter 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:

w If a measurement is saved with calibration and interpolated calibration on, it will be restored with interpolated calibration on.

w A calibration stored from one instrument and recalled by a different one will be invalid. lb ensure maximum accuracy, always recalibrate in these circumstances.

nNo 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. See Chapter 7, “Specifications and Measurement Uncertainties,” for allowable temperature ranges for individual specifications.

nThe HP 8753E can read disk illes created by the HP 8753B/C/B and the HP 8753BWB can read illes created by the HP 8753E. A disk file translator is available to make HP 8753A disk files compatible with HP 8753B files. These flies can then be read by the HP 8753E. Contact your local Hewlett-Packard Sales and Service Office for a copy of this disk ille translator.

124 Preset State and Memory Allocation