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Sources of error in DC current measurements
When you connect the internal DMM in series with a test circuit to measure current, a measurement error is
introduced. The error is caused by the DMM's series burden voltage. A voltage is developed across the wiring
resistance and current shunt resistance of the internal DMM as shown below:
Where:
V
= Source voltage
s
R
= Source resistance
s
V
= Current shunt resistance
b
Sources of error in AC current measurements
Burden voltage errors, which apply to DC current, also apply to AC current measurements. However, the burden
voltage for AC current is larger due to the internal DMM's series inductance and the measurement connections. The
burden voltage increases as the input frequency increases. Some circuits may oscillate when performing current
measurements due to the internal DMM's series inductance and the measurement connections.
Keysight DAQ970A/DAQ973A User's Guide
4 Measurement Tutorials
241
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