User Manual

TWO CHANNEL MEASUREMENTS
Your Mooshimeter 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 Mooshimeter 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 finds 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-varying component below 1kHz. Often this test
current can be the current already present within the system due
to normal operation. For example, an AC system’s steady state or
a DC systems startup transient may provide sufficient data.
FIGURE 7 CURRENT CLAMP AND CURRENT SHUNT COMPARISON