Velleman LAB1 Manuel d'utilisateur télécharger pdf (Page 10)

5. DIODE TEST

1. Connect the red test lead to "VΩmA" jack and the black one to the "COM" jack (the red lead has a positive

polarity "+".).

2. Set the rotary switch in the " " position.

3. Connect the red test lead to the anode of the diode to be tested and the black test lead to the cathode of the

diode. The approx. forward voltage drop of the diode will be displayed. If the connection is reversed, the

display will merely show a "1".

6. TRANSISTOR TEST

1. Set the rotary switch in the "hFE" position.

2. Determine whether the transistor under testing is NPN or PNP and locate the emitter, base and collector

leads. Insert the leads into the proper holes of the hFE-socket on the front panel.

3. Read the approximate hFE-value obtained under the following test conditions : a base current of 10µA and

Vce 3V.

7. AUDIBLE CONTINUITY TEST

1. Connect the red test lead to "VΩmA" and the black one to "COM".

2. Set the range switch in the " " position.

3. Connect the test leads to two points of the circuit to be tested. If continuity exists, the built-in buzzer will

sound.

BATTERY & FUSE REPLACEMENT

Digital multimeter

When " " is displayed, the battery should be replaced.

To replace the battery simply remove the screw at the back of the case, slide out the battery compartment.

Remove the old specimen and insert the new one.

 Please remember to observe battery polarity.

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Velleman LAB1 Manuel d'utilisateur Page 10