SDM3055 Series Digital Multimeter User Manual
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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 and
Diode 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 (HI sense and LO sense) terminal
HI sense and LO sense are used for 4-wire Resistance measurement. Two protection limitations
are defined:
⚫ HI sense-LO sense protection limitation: 2000Vpk.
⚫ LO sense-LO sense 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 use the fuse of specified type and level to replace this fuse.
IEC Measurement Category II Over-voltage Protection
SDM3055 Digital Multimeter provides over-voltage protection for line-voltage mains connections
meeting both of the following conditions toavoid the danger of electric shock:
⚫ The HI and LO input terminals are connected to the mains under Measurement Category II
conditions as following.
⚫ The maximum line voltage of the mains is 600VAC.
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