Agilent Technologies 3458A Calibration Manual page 11

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).
WARNING
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 42V are connected to
any terminal. Regard all terminals as being at the same
potential as the highest voltage applied to any terminal.
Agilent 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.
Caution
The current input terminals (I) are rated at ±1.5A peak with a
maximum non-destructive input of <1.25A RMS. Current inputs
are fuse protected. The multimeter's input voltage ratings are:
HI to LO Input:
HI/LO 9 Sense to LO Input:
HI to LO 9 Sense:
LO Input to Guard:
Guard to Earth Ground:
HI/LO Input, HI/LO 9 Sense,
or I terminal to earth ground:
Front terminals to rear
terminals:
The multimeter will be damaged if any of the above maximum
non-destructive inputs are exceeded.
Rated Input
±l000V peak
±200V peak
±200V peak
±200V peak
±500V peak
±l000V peak
±1000V peak
Chapter 1 3458A Calibration Introduction
Maximum
Non-Destructive Input
±1200V peak
±350V peak
±350V peak
±350V peak
±l000V peak
±1500V peak
±1500V peak
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