9
DC Current Measurement (see Figure 3)
Warning
Never attempt an in-circuit current measurement where the
voltage between terminals and ground is greater than 60V. If the
fuse burns out during measurement, the meter may be damaged
or the operator may be hurt. Use proper terminals, functions and
range for the measurement. When the testing leads are connected
to the current terminals, do not parallel them across any circuit.
The current measurement has 3 measurement positions on the
knob: 200 μA, 200 mA and 10A. To measure current, do the
following:
1. Turn off power to the circuit. Discharge all high-voltage
capacitors.
2. Insert the red test lead into the VΩmA or 10A terminal and the
black test lead into the COM terminal.
3. Set the rotary switch to an appropriate measurement position in
A range.
4. Break the circuit path to be tested. Attach the red probe to the
power source and the black probe to the item drawing the load.
5. Turn on power to the circuit.
6. The measured value shows on the display.
Note
1. If the value of current to be measured is unknown, use the
maximum measurement position (10A) and reduce the range
step by step until a satisfactory reading is obtained.
2. When current measurement has been completed, disconnect
the connection between the testing leads and the circuit under test.
Measuring Resistance (see Figure 4)
Warning
To avoid damage to the multimeter or to the device under test,
disconnect circuit power and discharge all the high-voltage
capacitors before measuring resistance.
The resistance measurement positions are 200Ω, 2,000Ω, 20kΩ,
200kΩ and 20MΩ. To measure resistance, connect the multimeter
as follows:
1. Insert the red test lead into the VΩmA terminal and the black
test lead into the COM terminal.
2.
Set the knob to an appropriate measurement position in Ω range.
3. Connect the test leads to the object being measured.
4. The measured value shows on the display.
Note
1. The test can add 0.1Ω to 0.3Ω of error to resistance
measurement. To obtain precision readings in low-resistance
measurement, that is the range of 200, short-circuit the input
terminals beforehand and record the reading obtained (call this
reading X). (X) is the additional resistance from the test leads.
Then use this equation: measured resistance value
(Y)-(X) = precision readings of resistance.
2. For high-resistance measurement (>1 MΩ), it is normal for it to
take several seconds to obtain a stable reading.
3. When resistance measurement has been completed,
disconnect the connection between the testing leads and the
circuit under test.
Figure 3
Figure 4
