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Input terminal protection limitation
Protection limitation is defined for the input terminal ：
1. Main input （ HI and LO ） terminal
HI and LO terminals are used for Voltage, Resistance,
Capacitance, Continuity, Frequency, Diode and temperture
measurement. Two protection limitations are defined:
 HI-LO protection limitation: 1000VDC or 750AVC. It's
the maximum measurable voltage. The limitation can be
expressed as 1000Vpk.
 LO-ground protection limitation ： LO terminal can "float"
500Vpk relative to the ground safely. The maximum
protection limitation of HI terminal relative to the ground is
1000Vpk. Therefore, the sum of the "float" voltage and the
measured voltage can't exceed 1000Vpk.
2. Sampling (HISense and LOSense) terminal
HISense and LOSense are used for 4-wire Resistance
measurement. Two protection limitations are defined:
 HISense-LOSense protection limitation: 2000Vpk.
 LOSense-LOSense protection limitation: 2Vpk.
3. Current input (I) terminal
I and LO terminals are used for current measurement. The
maximum current which go through the I terminal is limited to
10A by the fuse on the back panel.
NOTE:
Voltage on the current input terminal corresponds to voltage
on LO terminal. To keep good protection, only replace with the
specified type and level fuse.
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