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11
Two Channel Measurements
Measuring Small Resistances/Calibrating a Current Shunt
Your DS200 Multimeter is capable of reading any two of its three channels simultaneously.
NOTE: Measurements using the internal current shunt will experience a degree of cross-talk due to the impedence of the
Common lead. Other measurement types will also experience this cross-talk, but it should be negligible.
MEASURING SMALL RESISTANCES/CALIBRATING A CURRENT
SHUNT
The DS200 Multimeter can be used to measure small resistances in
a live circuit. The meter simultaneously measures the current and the
corresponding voltage with the precision voltage channel (Ω), and then
nds the slope to calculate resistance.
This can be done with either the internal current shunt or an external
current clamp. Using a current clamp allows the measurement to be
done without breaking the circuit and allows for test currents above 10
Amps.
Wire the meter in as shown and enable the measurement mode. Apply
a test current and run the analysis.
The analysis works best with several points along the curve. Therefore,
the optimal test current has a large magnitude and a strong time-vary-
ing component below 1kHz. Often this test current can be the current
already present within the system due to normal operation. For exam-
ple, an AC system’s steady state or a DC systems startup transient
may provide sucient data.
Figure 7: Current Clamp and Current Shunt Comparison
DS200_Technical_Manual_bleed_.indd 11 7/25/2022 4:08:57 PM
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