Keysight Technologies 3458A Guide D'utilisation page 79

– Only qualified, service trained personnel who are aware of the hazards
WARNING
– Measuring high voltage is always hazardous. All multimeter input
– Keysight recommends that the wiring installer attach a label to any wiring
Keysight 3458A User's Guide
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.
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.
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.
Configuring for Measurements 3
79