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Tips for measuring resistance
- Because the meter’s test current flows through all possible paths
between the test probe tips, the measured value of a resistor in
a circuit is often different from the resistor’s rated value.
- The test leads can add 0.1Ω to 0.2Ω of error to resistance mea-
surements. To measure the resistance of the leads, touch the
probe tips together and read the resistance. If necessary, you
can press the REL button to automatically subtract this value.
- The resistance function can produce enough voltage to forward-
bias silicon diode or transistor junctions, causing them to con-
duct. Do not use the 50MΩ range for measuring the in-circuit
resistance to avoid this.
5.3.1 Continuity Test
The continuity function detects intermittent opens and shorts lasting
as little as 1 millisecond. These brief contacts cause the meter to emit
a short beep. This function is convenient for checking wiring connections
and operation of switches, A continuous beep tone indicates a comple-
te wire.
Caution
Using resistance and continuity function in a live circuit will produce
false results and may damage the instrument. In many cases the
suspicious components must be disconnected from the circuit under
test to obtain accurate results.
The 1 ms PEAK, MIN/MAX and REL functions are not available when
continuity is selected.
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