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f) Diode Test
Make sure that all the circuit parts, switches and components and other objects of
measurement are disconnected from the voltage and discharged.
- Turn the DMM on and select measuring range
- Press "SELECT" on the VC270 and VC290 to switch the measurement
function. The diode symbol appears in the display. Pressing this button
again takes you to the next measuring function.
- Plug the red measuring lead into the Ω measuring socket (7) and the
black measuring lead into the COM measuring socket (8).
- Check the measuring leads for continuity by connecting both measuring
probes with one another. The value must be approximately 0 V.
- Now connect the two measuring probes with the object to be measured
(diode).
- The display shows the continuity voltage "UF" in volt (V). If "OL" appears,
the diode is measured in reverse direction (UR) or the diode is faulty
(interruption). Perform a counter-pole measurement to check.
- After measuring, remove the measuring leads from the measured object and turn the DMM off.
g) Continuity Check
Make sure that all the circuit parts, switches and components and other objects of
measurement are disconnected from the voltage and discharged.
- Turn the DMM on and select measuring range
- Press "SELECT" twice on the VC270 and VC290 to switch the measure-
ment function. The symbol for continuity check now appears in the dis-
play. Pressing this button again takes you to the first measuring function
etc.
- Plug the red measuring lead into the Ω measuring socket (7) and the
black measuring lead into the COM measuring socket (8).
- A continuity value of less than 10 Ohm is identified as continuity; in this
case a beep sounds.
- If "OL" (overload) or 1 appears on the display, you have exceeded the
measuring range or the measuring circuit has been broken.
- After measuring, remove the measuring leads from the measured object and turn the DMM off.
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