Ac/Dc Voltage Measurement; Resistance And Continuity Measurement - MAC TOOLS EM720T Manual De Instrucciones

AC/DC Voltage Measurement:

1. Rotate function selection switch to voltage measurement position.
2. Press "FUNC" key to select AC or DC voltage.
3. Connect the black test probe to the COM input jack and the red
probe to the V input jack.
4. Read the measured value from LCD display. When measuring DC
voltage, the display will simultaneously show the voltage polarity
which is connected with red test probe.

Resistance and Continuity measurement:

When measuring resistance or circuit continuity, to avoid injury or meter
damage, turn off the power to the circuit and discharge all capacitors.
1. Rotate function selection switch to resistance measurement posi-
tion, and turn off the power to the circuit to be tested.
2. Connect the black test probe to the COM input jack and the red
probe to the V input jack.
3. Measure the resistance of circuit to be tested with other ends of
test probes.
4. Read the resistance value from LCD display. If it is overload, "OL"
will display on the LCD display.
5. If the measured circuit resistance is less than about 40Ω, the
buzzer will sound continuously.
Here are some tips for measuring resistance:
• The resistance measured on a circuit is usually different from the
rated value of resistance. This is because the test current of the
meter will flow through all possible channels between test probes.
• When measuring low resistance, to ensure accuracy, make a short
circuit between the test probes and read the resistance value of
the short circuit. This resistance value should be subtracted after
measuring the resistance to be tested.
• When there is no input (for example, open circuit), the display will
show "OL", which means that the measured value is out of range.
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