Keysight Technologies 3458A Guide D'utilisation page 80

3 Configuring for Measurements
The current input terminals (I) are rated at
CAUTION
non-destructive input of <1.25 A RMS. Current inputs are fuse protected.
The multimeter's input voltage ratings are:
Table 3-1
HI to LO Input:
HI/LO W Sense to LO Input:
HI to LO W Sense Input:
LO Input to Guard:
Guard to Earth Ground:
HI/LO Input, HI/LO W 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.
Guarding
The measurement connection illustrations in this chapter show the multimeter's
Guard terminal connected to the low side of the measurement source (guarded
measurements). This configuration provides maximum effective common mode
rejection (ECMR) on the input terminals selected by the Terminals switch,
assuming the Guard switch is in the Open (out) position. For non-guarded
measurements, depress the Guard switch (TO LO position) and do not connect the
Guard terminal to the measurement source. In the TO LO position, the Guard
switch internally connects the Guard terminal to the LO Input terminal on the
terminals selected by the Terminals switch. This configuration provides reduced
ECMR.The specifications in
measurements. We recommend high impedance, low dielectric absorption cables
for all measurement connections.
80
Input ratings
Appendix A
±
1.5 A peak with a maximum
Rated input
± 1000 V peak
± 200 V peak
± 200 V peak
± 200 V peak
± 500 V peak
± 1000 V peak
± 1000 V peak
shows the ECMR for guarded
Keysight 3458A User's Guide
Maximum non-
destructive input
±1200 V peak
± 350 V peak
± 350 V peak
± 350 V peak
± 1000 V peak
± 1500 V peak
± 1500 V peak