UNI-T UT8806E Quick Manual page 4

Quick Guide
2) Protection limit from LO to ground. The LO input terminal can be safely "floated" to a maximum of
500 Vpk with respect to ground. The protective limit of the HI terminal is a maximum of 1000 Vpk
with respect to ground. Therefore, the sum of the "floating" voltage and the measured voltage must
not exceed 1000 Vpk.
Sampling Terminal (HI sense and LO sense)
2.
HI Sense and LO Sense terminals are used for four-wire impedance test and measurement. These two
terminals define the following two protection limits.
Protection limit from HI Sense to LO Sense. Protection limit of HI Sense and LO Sense are 200 Vpk.
1)
Protection limit from LO Sense to LO. Protection limit of LO Sense and LO are 2 Vpk.
2)
Current Input Terminal (mA and A)
3.
1) The mA and LO terminal are used to measure the current test below 200mA. The rear panel fuse
provides a maximum protection limit of 250mA for current flowing through the mA terminal.
2) The A and LO terminal are used to measure the current test from 200mA to 10A. The rear panel fuse
provides a maximum protection limit of 10A for current flowing through the A terminal.
Notes
The voltage at the current input terminal is about the same as the voltage at the LO terminal. To maintain
good protection, this fuse can only replace with a fuse of the specified type and rating.
IEC Measurement Category II Overvoltage Protection
To avoid the risk of electric shock, the UT8806E digital multimeter provides overvoltage protection for
electric mains connections that meet both of the following conditions.
1. The HI and LO input terminals are connected to the electric mains under Measurement Category II
conditions (described below).
2. The maximum line voltage of the electric mains is 300 VAC.
Warnings
IEC measurement category II includes electrical installations connected to the mains via a socket on a branch
circuit. These devices include most small appliances, test equipment, and other devices plugged into branch
circuit sockets.
Measurement of UT8806E Digital Multimeter
The HI and LO input terminals are connected to the electric mains (up to 300VAC) in these devices, or to
branch circuit socket. However, the HI and LO input terminals of the UT8806E cannot be connected to the
electric mains in permanently installed electrical devices, such as main breaker panels, sub-panel breakout
boxes, or permanently wired motors. These devices and circuits are susceptible to overvoltage that exceed
the protection limits of the UT8806E.
Notes
The voltage above 300VAC can only be measured in circuits that disconnected from the electric mains.
However, transient overvoltage also exist in circuits when disconnected from the electric mains, and the
UT8806E can safely withstand incidental transient overvoltage up to 2500 Vpk.
Do not use this device to measure circuits where transient overvoltage may exceed this level.
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UT8806E Desktop Digital Multimeter
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