DVM8264
- 5 -
VELLEMAN
e.
Diode Test
Use the diode test to check diodes and other semiconductor devices. The diode test sends a current through the
semiconductor junction and measures the voltage drop across the junction. A good silicon junction drops between
0.5V and 0.8V.
To test a diode out of a circuit:
1.
Set the rotary switch to range.
2.
Connect the black and red test leads to the COM and terminals respectively.
3.
For forward-bias readings on any semiconductor component, place the red test lead on the component’s
anode and place the black test lead on the cathode.
4.
The meter will show the approximate forward voltage of the diode. If the test lead connection is reversed,
only figure “1” is displayed.
In a circuit, a good diode should still produce a forward bias reading of 0.5V to 0.8V. However, the reverse-bias
reading can vary depending on the resistance of other pathways between the probe tips.
f.
Continuity Check
Continuity is a complete path for current flow. The beeper sounds if a circuit is complete.
To test for continuity:
1.
Set the rotary switch to range.
2.
Connect the black and red test lead to the COM and
Ω
terminals respectively.
3.
Connect the test leads to the resistance in the circuit being measured.
4.
When the test lead to the circuit is below 30
Ω
, a continuous beeping will indicate it.
NOTE:
Continuity test is available to check open/short of the circuit.
g.
Capacitance Measurement
Capacitance is the ability of a component to store an electrical charge. The unit of capacitance is the farad (F).
Most capacitors are in the nanofarad to microfarad range. The meter's capacitance ranges are 20nF, 200nF, 2
µ
F
and 20
µ
F.
To measure capacitance:
1.
Set the rotary switch to the proper range.
2.
Connect the black and red test leads to the COM and terminals respectively. You can also measure the
capacitance by using the special multi-function socket.
3.
Connect the test leads to the capacitor being measured and read the displayed value.
To avoid electrical shock and/or damage to the instrument, disconnect the circuit power and
discharge all high-voltage capacitors before testing diodes.
To avoid electrical shock and/or damage to the instrument, disconnect the circuit power and
discharge all high-voltage capacitors before testing the continuity.
To avoid electrical shock and/or damage to the instrument, disconnect the circuit power and
discharge all high-voltage capacitors before measuring capacitance. Use the DC voltage
function to confirm that the capacitor is discharged.
