2. LO Sense to LO Protection Limit. LO Sense to LO Protection Limit: 2 Vpk.
Current Input (I) Terminal
The I and LO terminals are used for current measurements. The I terminal has a
protection limit of 10 A(DM858)/3.15 A(DM858E) maximum current flowing through
the terminal by the front-panel current input fuse.
CAUTION
The current input terminal will be at approximately the same voltage as the LO terminal
unless the current input fuse is blown. To maintain protection, replace this fuse only with
a fuse of the specified type and rating.
1.4 IEC Measurement Category II
To protect against the danger of electric shock, DM858/DM858E Digital Multimeter
provides overvoltage protection for line-voltage mains connections meeting both of
the following conditions:
1. The HI and LO input terminals are connected to the mains under Measurement
Category II conditions, defined below.
2. The mains are limited to a maximum line voltage of 300 VAC.
WARNING
IEC Measurement Category II includes electrical devices connected to mains at an outlet
on a branch circuit. Such devices include most small appliances, test equipment, and other
devices that plug into a branch outlet or socket. DM858/DM858E may be used to make
measurements with the HI and LO inputs connected to mains in such devices (up to 300
VAC), or to the branch outlet itself. However, DM858/DM858E may not be used with its HI
and LO inputs connected to mains in permanently installed electrical devices such as the
main circuit-breaker panel, sub-panel disconnect boxes, or permanently wired motors.
Such devices and circuits are subject to overvoltages that may exceed the protection
limits of the DM858/DM858E.
CAUTION
Voltages above 300 VAC may be measured only in circuits that are isolated from mains.
However, transient overvoltages are also present on circuits that are isolated from mains.
DM858/DM858E is designed to safely withstand occasional transient overvoltage up to
2500 Vpk. Do not use this equipment to measure circuits where transient overvoltage
could exceed this level.
1.5 Ventilation Requirement
This instrument uses a fan to force cooling. Please make sure that the air inlet and
outlet areas are free from obstructions and have free air. When using the instrument
Safety Requirement
DM858 Series User Guide
4
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
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