3458A Calibration Introduction 1
Keysight 3458A Calibration Manual 25
Monitoring Calibration Constants
Each time you do an ACAL, most calibration constants are recalculated. Executing
an ACAL ALL recalculates 197 of the 253 calibration constants. The remaining
constants (such as internal reference and offset constants) are externally derived
and not changed by an ACAL. Periodically you may want to monitor a particular
constant and track its movement within the lower and upper limits (see CAL?
command, cal_item parameter). This may give you an indication of the calibration
cycle you want to establish for your 3458A. Information on the externally derived
calibration constants and the 197 internally derived calibration constants is
presented on the last page of Appendix B. Detailed information about each
constant appears in the CAL? command located in Chapter 5, "Command
Summary".
– Only qualified, service trained personnel who are aware of the hazards
involved should remove or install the multimeter or connect wiring to the
multimeter. Disconnect the multimeter's power cord before removing any
covers, changing the line voltage selector switches, or installing or
changing the line power fuse.
– Measuring high voltage is always hazardous. All multimeter input
terminals (both front and rear) must be considered as hazardous
whenever inputs in excess of 42 V are connected to any terminal. Regard
all terminals as being at the same potential as the highest voltage
applied to any terminal.
– Keysight Technologies recommends that the wiring installer attach a
label to any wiring having hazardous voltages. This label should be as
close to the input terminals as possible and should be an eye-catching
color, such as red or yellow. Clearly indicate on the label that high
voltages may be present.
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