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5. OPERATING INSTRUCTIONS
5.1 AC and DC Voltage Measurement
WARNING:
Risk of electrocution. High-voltage circuits, both AC and DC, are very dangerous and should
be measured with great care.
● To avoid electrical shock and/or damage to the instrument, do not attempt to take any
voltage measurement that might exceed 1000VDC or 750VAC RMS.
●To avoid electrical shock and/or damage to the instrument, do not apply more than
1000VDC or 750VAC RMS between the common terminal and the earth ground.
1) Set the rotary switch to the voltage position (~ mV / ~ V).
2) Insert the black test lead banana plug into the negative COM jack; insert the red test
lead banana plug into the positive V/Ωjack.
3) Touch the black test probe tip to the negative side of the circuit; touch the red test
probe tip to the positive side of circuit.
4) Read the voltage in the LCD display. The polarity of red test lead connection will be
indicated when making DC Voltage measurement.
NOTE:
Unstable display may occur, especially at the low voltage range measurement, even no test
leads insert at input terminals, if an erroneous readings suspected, short the Vjack and
COM jack and make sure the zero displayed at LCD.
5.2 Current Measurement
WARNING:
●To avoid damage to the meter, check the fuse of the meter before current measurement.
●User the proper terminals, function and range for any current measurement
●Never attempt an open circuit potential to earth is greater than 250V, do not place the
test leads in parallel with a circuit or component when the test leads are plugged into the
current terminals.
1) Remove the power from the circuit under test and discharge the capacitors of the
circuit.
2) Set the rotary switch to current measuring range.
3) Insert black test lead banana plug into the negative COM jack, for current measurement
less than 400mA (for model HK68C less than 600mA) insert the red test lead banana plug
into the mA jack, for current measurement between 400mA to 10A (for model HK68C
between 600mA to 10A), insert the red test lead banana plug into 10A jack.
4) Break the circuit under test, connect the black test lead to the more negative side of
the break, and connect the red test lead to the more positive side of break.
