Velleman DVM1090 User Manual - page 12
DVM1090 GB
11
5.15. Diode Test
1. Connect the black test lead with the COM jack and the red test lead with the V jack.
2. Place the range switch in the
range position.
3. Connect the red lead with the anode and the black lead with the cathode of the diode to be tested.
4. Read the value from the LCD.
REMARKS
•
The LCD will display the possible forward voltage drop of the diode.
•
The overrange indication “1” will be displayed if the leads have not been connected properly.
•
The overrange indication “1” is displayed when the input is not connected e.g. in case of an open circuit.
5.16. Continuity Test
Disconnect the test leads from the circuits to be measured before testing a capacitor in order to avoid electroshocks.
Also make sure the capacitors have been discharged fully before inserting them into the test socket.
Deactivate the circuit to be tested and make sure all capacitors have been fully discharged prior to measuring the
circuit’s continuity.
1. Connect the black test lead with the COM jack and the red test lead with the
Ω
jack.
2. Place the range switch in the desired range position.
3. Connect the test leads with two points of the circuit to be tested.
4. The built-in buzzer will sound if continuity exists.
REMARKS
•
The overrange indication “1” is displayed when the input is not connected e.g. in case of an open circuit.
5.17. Transistor Test
1. Put the rotary switch in the hFE-position.
2. Plug the multifunction socket into the COM jack and the V jack.
3. Identify whether the transistor is NPN or PNP type and locate the emitter, the base and the collector. Insert the
leads into the proper holes of the transistor on the multifunction socket for testing.
4. Read the value from the LCD.
5.18. TTL Logic Test
1. Connect the black test lead with the COM jack and the red test lead with the V jack.
2. Put the range switch in the range position.
3. Connect the test leads with two points of the circuit to be tested.
4. When the logic level is
≤
0.8V, the LCD will display ▼ and the buzzer will sound. The LCD displays ▲ when the
logic level
≥
2.0V.