Continuity Testing With The Internal Sounder; Diode Testing; Measuring Capacitance - Iso-Tech IDM 203 RMS Instruction Manual

Continuity testing with the internal sounder

1. Plug the black lead into the "COM" input terminal and the red lead into the "V-Ω- Hz- " input terminal.
2. Turn the function switch to "Ω " and use the function button to set the meter to continuity testing.
3. Apply the probes to the circuit to be tested. The internal sounder will operate if the resistance is less than about 50 Ω.

Diode testing

1. Turn the function switch to " ".
2. Plug the black lead into the "COM" input terminal and the red lead into the "V-Ω-Hz- " input terminal.
(Note: The red lead is positive.)
3. Apply the probes to the diode to be tested. With a non-faulty silicon diode, the voltage shown in the forward direction will be
between 0.500 and 0.900V. With a faulty diode, "000" (short-circuit) or a reading of approx. 3.2V (open circuit) will be shown.
4. When tested in the opposite direction (blocking direction), a reading of approx. 3.2V will appear for a non-faulty diode and
"000" (short circuit) or a different reading of less than 3.2V for a faulty one.

Measuring capacitance

1. Plug the black lead into the "COM" input terminal and the red lead into the "V-Ω-Hz- " input terminal.
2. Turn the function switch to " ".
3. When measuring the capacitance of polarised capacitors be sure to apply the probes with the correct polarity.
4. Apply the probes to the capacitor whose capacitance you wish to measure.
Important : 1. The capacitor must be fully discharged before any measurements are made.
2. To obtain a more accurate measurement you are advised to use the relative mode (press REL button) to
correct for any stray capacitances.
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