Testing Diodes; General Use, Maintenance, Care - Wetekom 37 99 74 Bedienungsanleitung

12. Testing Diodes

Use the diode test to check diodes, transistors, and other semiconductor
devices. The diode test sends a current through the semiconductor junction,
and then measures the voltage drop across the junction. A good Silicon
junction drops between 0.5 V and 0.8 V.
To test out a diode out of a circuit, connect the multimeter as follows:
1. Insert the red test lead into the V/Ω/
lead into the COM input (22).
2. Set the rotary switch (20) to ♫
3. For forward voltage drop readings on any semiconductor component, place
the red test lead on the component's anode and place the black test lead
on the component's cathode. The measured value shows on the display.
Notes
In a circuit, a good diode should still produce a forward voltage drop
reading of 0.5 V to 0.8 V; however; the reverse voltage drop reading can
vary depending on the resistance of other pathways between the probe
tips.
Connect the test leads to the proper terminals as stated above to avoid
error display. The LCD will display "1" indicating open-circuit for wrong
connection. The unit of diode is Volt (V), displaying the positive-connection
voltage-drop value.
When diode testing has been completed, disconnect the connection
between the testing leads and the circuit under test.

13. General Use, Maintenance, Care

Your digital multimeter is a high precision instrument and should be treated
accordingly. Open only to if you have to replace the fuse or the battery. Turn it
off before and remove the leads from the circuit under test. Due to the high
integration of the device and the risk of affecting the accuracy, you never
should modify or repair the device. For repair and calibration service, contact
our customer service.
Do not expose the device to water, dust, sand, dirt and extreme temperatures.
All these factors cause damage and shorten the life of electric contacts,
batteries, body parts, switches and electronic components. Only use full and
leak-proof batteries such as Alkaline types.
Do not use corrosive chemicals for cleaning in order not to damage the
surfaces, the label and the display window.
Using
/ºC/ºF input (21) and the black test
.
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