Understanding
voltage drop testing.
Testing for voltage drop.
- Lead
1.)
Connect the voltmeter red lead (+) to the power
+ Lead
(or “most” positive) side of the component, circuit
or connection to be tested.
2.)
Connect the voltmeter black lead (-) to the
ground (or “least” positive) side of the component,
circuit or connection to be tested.
3.)
Set the meter scale to exceed the expected test
voltage. (Auto-range on digital voltmeters).
Turn “on” the circuit, (remember, current must
be flowing through the circuit for resistance to be
found) and read the voltage.
4.)
Voltage Drop Test - Feed Side of Circuit
Figure 23
+ Lead
- Lead
Voltage Drop Test - Ground Side of Circuit
Figure 24
Voltage drop specifications (Maximums)
Voltage drop testing can isolate areas in a circuit
where undesirable resistance is present. It is an
important test for both low and high amperage
circuits. See table 2 for maximum voltage readings
when testing circuits.
High Amperage
Circuits (>20 A)
0.4 Volts feed side
Low Amperage
Circuits (<20 A)
0.2 Volts feed side
0.2 Volts ground side
0.4
Volts ground side
Table 2
When to perform a voltage drop test.
When you encounter poor performance from an
electrical component. A test of the circuit indicates
that the amperage flow is lower than required to
operate
resistance
the system. The area of excessive
must
be
located
and repaired.
Performing a voltage drop test will help locate the
area of excessive resistance.
10
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