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User's Manual
Avoid Severe Environment. Avoid using the instrument in high temperature, high humidity,
flammable, explosive and strong electromagnetic environments.
Disconnect the Power Supply. Before testing the impedance, conduction, diodes, or
capacitance, disconnect power and discharge all high voltage capacitors.
Input Terminal Protection Limit
1.
Main Input Terminal (HI and LO)
HI and LO input terminals are used for voltage, impedance, capacitance, continuity,
frequency and diode test measurements. These two terminals define the following two
protection limits.
1)
Protection limit from HI to LO, which is 1000 VDC or 750 VAC. This is also the
maximum voltage that can be measured. This limit can also be expressed as a
maximum of 1000 Vpk.
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.
1) Protection limit from HI Sense to LO Sense. Protection limit of HI Sense and LO
Sense are 200 Vpk.
2) Protection limit from LO Sense to LO. Protection limit of LO Sense and LO are 2 Vpk.
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.
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UT8806E Desktop Digital Multimeter
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