If the diode is working properly, the Multimeter will display the forward voltage drop across the diode, approximately 0.6V. Measuring Voltage The DMM can measure both d.c. and a.c. Voltage. DC Voltage The straight line ( ⎓ ) adjacent to the “V” is to measure d.c. Voltage. Plug-in the correct leads into the DMM (if they are not already plugged in) and set the selector knob to measure d.c. Voltage.
Fluke DMM Measuring a d.c. Pass Splitter
The diode test feature is usually combined with a continuity test and is represented by a Diode Symbol.
To test a diode, set the knob to Diode Test mode and connect the red probe to Anode of the diode and black probe to Cathode of the diode.
DC Voltage Measurement Knob Selection
On some DMM’s the number the knob points to is the maximum value that can be measured, d.c. voltage in this case.
To measure the voltage of a 1.5V battery, set the knob to 20.
The Fluke DMM has an ‘AUTO’ setting and will automatically adjust the correct range if selected. If the leads are connected in reverse, that is red probe to negative terminal and Black probe to positive terminal. The DMM displays a negative value with same magnitude.
Fluke DMM measuring the forward bias of a diode
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