DVM890 GB
4
3.4. Measuring AC Current
1. Connect the black test lead (-) to the "COM" jack and the red test lead (+) to the "mA" jack
for measurements of max. 200mA. Move the red test lead to the "10A" jack for
measurements of max. 20A (for max. 15 sec. at a stretch).
2. Select the A
∼
range with the FUNCTION switch.
3. Connect the test leads IN SERIES with the load under measurement.
4. The measured current is displayed on the LCD.
Remark : Set the FUNCTION switch to the highest range and gradually work your way down if
the current range is unknown beforehand.
3.5. Measuring Resistance
1. Connect the black test lead (-) to the "COM" jack and the red test lead (+) to the "V
Ω
Hz" jack.
2. Select the appropriate "
Ω
" range with the FUNCTION switch and connect the test leads with
the load to be measured.
Remarks :
v
The meter may need a few seconds to produce a stable reading for resistance
measurements in excess of 1M
Ω
.
v
The overrange indication (“1.”) will appear on the display if the input is not connected or if
the resistance being measured exceeds the max. value of the selected range.
v
Disconnect the circuit to be tested and make sure that all capacitors are fully discharged
before measuring the in-circuit resistance.
3.6. Measuring Capacitance
1. Connect the test capacitor to the "Cx" input connection (9 in figure on p. 2). Do NOT connect
the capacitor to one of the 4 input jacks (viz. "10A", "mA", "COM" or "V
Ω
Hz" jack).
2. Select the "Cx" range with the FUNCTION switch.
Remarks :
v
Do not connect an external voltage to the input terminal. Discharge capacitors before
connecting them.
v
Units : 1pF = 10
-6
µF
1nF = 10
-3
µF.
3.7. Testing Diodes & Continuity
1. Connect the black test lead (-) to the "COM" jack and the red test lead (+) to the "V
Ω
Hz" jack.
2. Select the
/
range with the FUNCTION switch and connect the test leads.
3. Connect the red test lead to the anode and the black test lead to the cathode of the diode to
be tested.
4. For continuity tests : connect the test leads to two random points of the circuit to be tested.
The incorporated buzzer is activated if the resistance between the two test leads is lower
than ± 30
Ω
.
