Audible Continuity Test - Velleman DVM501 Mode D'emploi

g) Resistance Measurements
1. Set the selection switch (#2) to the desired Ω position (200, 2000, 200k, 2000k).
2. Plug the black test lead in COM and the red test lead in V/Ω/mA/°C
3. Make sure all power of the circuit to be measured is off.
4. Connect the test leads to the circuit to be measured.
5. Read the measured value from the LCD.
h) Diode Measurements
1. Set the selection switch (#2) to the
2. Plug the black test lead in COM and the red test lead in V/Ω/mA/°C
3. Make sure all power of the circuit to be measured is off.
4. Connect the red test lead to the anode and the black test lead to the cathode of the diode to be measured.
5. The forward voltage drop (mV) will be displayed. If the diode is reversed, figure "1" will be shown.
i) Transistor hFE Measurements
1. Set the selection switch (#2) to the hFE position.
2. Determine whether the transistor is NPN or PNP type and locate the emitter, base and collector leads. Insert the
leads into the correct holes of the hFE socket on the front panel.
3. The meter will display the approx. hFE value at a base current of 10µA and Vcd=2.8Vdc.
j) Audible Continuity Test
1. Set the selection switch (#2) to the
2. Plug the black test lead in COM and the red test lead in V/Ω/mA/°C.
3. Connect the test leads to two points of the circuit to be tested ; if the resistance is <100 Ω, the buzzer will sound.
6. Maintenance
CAUTION: Before opening the case, set the selection switch to OFF and disconnect all test leads in order to avoid
electric shock hazard.
a) Battery Replacement
The battery should be replaced when "BAT" appears on the display. Turn loose the screws at the back and open the
case. Replace the old battery (1 x 9V-battery type 6F22 or equivalent), close the case and tighten the screws.
b) Fuse Replacement
The fuse rarely needs to be replaced ; a blown fuse is usually the result of the operator's error. Turn loose the screws
at the back and open the case. Replace the old fuse (F 250V/200mA), close the case and tighten the screws.
Remark : The contents and specifications of this manual can be subject to change without prior notice
DVM501
position.
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5 VELLEMAN