Radio Shack 2200813 - Continuity and Diode Testing Procedures; Performing Continuity Checks; Performing Diode Checks

14
Operation
Checking Continuity
You can check for shorted or open electrical circuits.
1. Disconnect power from the circuit and discharge all capacitors.
2. Rotate the function dial to
Ω
.
3. Repeatedly press SELECT until appears.
4. Connect the black test lead to one end of the circuit and the red lead to the other end.
• Open appearsifthecircuitresistanceisgreaterthanabout50±10ohms(meaningthe
circuitisnotshorted).
• Shrtappearsandthebuzzersoundsifthecircuitresistanceislessthanabout50±10
ohms(meaningthecircuithaslowohmageorisshorted).
Checking Diodes
You can check diodes, transistors, and other semiconductors for opens, shorts, and normal
operation. You can also determine the forward voltage and polarity for diodes and check diode
polaritywhenpositive(+)andnegative(–)sidesarenotmarked.
1. Disconnect power from the circuit and discharge all capacitors.
2. Rotate the function dial to
Ω
.