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6. Operating Instructions
Important: Before operating this product, read and
understand all the safety instructions listed in this
manual.
Important: Inspect the device for signs of damage,
particularly the probes and insulated cables. Replace
faulty leads immediately.
For each measurement type, connect the positive probe
(7) to the voltage, resistance and amperage probe
terminal (8), and connect the negative probe (5) to the
common earth probe terminal (1).
If the display gauge needle does not move during
operation, check the polarity of the probes at the
component contacts and the device terminals.
6.1 Installing the Battery
This product requires 1 x 1.5V AA battery (not supplied)
to operate.
WARNING! To prevent an electric shock, the test
cables MUST be disconnected from the device
before accessing the battery.
1. Remove the screw on the back of the device to loosen
the battery compartment cover.
2. Separate the front of the device from the rear casing
at the divide around the tapered edge of the housing.
3. Install the battery between the two contacts above
the circuit board, observing the polarity indicated.
4. Reassemble the device housing and tighten the rear
screw securely.
6.2 The Function Dial
Use the function dial (3) to select the value that most
accurately represents the anticipated measurement
range from the appropriate measurement type. If the
value to be measured is not known, set the function dial
to the highest available range and reduce it until a
suitable reading is displayed.
The dial can be rotated 360° through the following zones:
• DC voltage (DCV)
• AC voltage (ACV)
• DC current (DCA)
• Resistance (OHMS)
• Battery voltage (BATT V)
Important: Disconnect the probes from any load before
adjusting the function dial.
6.3 Voltage Measurement
1. Use the function dial (3) to select the appropriate
range from the DC voltage ranges or AC voltage
ranges zone as appropriate.
2. Position the probe contacts across the source of the
circuit to be measured, observing the correct polarity.
3. Enable power to the circuit to be measured and read
the value from the appropriate scale on the gauge.
Important: If the reading is not appropriate for the
circuit, disconnect the probes from the circuit and
adjust the function dial to a more appropriate range.
6.4 DC Current Measurement
1. Use the function dial (3) to select the appropriate
range from the DC current ranges zone.
2. Open the circuit to be measured and connect the
probes in series, using the correct polarity, to bridge
the gap.
3. Enable the power to the circuit to be measured
and read the value from the appropriate scale on
the gauge.
Important: If the reading is not appropriate for the
circuit, disconnect the probes from the circuit and
adjust the function dial to a more appropriate range.
6.5 Resistance Measurement
1. If the resistance to be tested is part of a circuit,
switch the circuit o, disconnect the power and allow
all capacitors to discharge before measurement.
WARNING! NEVER measure resistance
across a voltage source or on a
powered circuit.
2. Use the function dial (3) to select the appropriate
range from the resistance ranges zone.
3. Touch the two probes together to short-circuit the
leads and use the ohms adjustment dial (6) to set
the gauge needle to a zero reading (top-right of
the gauge).
4. Touch the probe contacts at either side of the
resistance to be measured and read the value from
the appropriate scale on the gauge.
Important: If the reading is not appropriate for the
circuit, disconnect the probes from the circuit and
adjust the function dial to a more appropriate range.
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