Voltage And Current In Dual Measurement - Keysight 34450A Guia Del Usuario

3 Measurement Tutorial
Figure 3-3
Consider an AC component of 1 Vrms signal with a DC offset of 100 mV. When
measuring at DCV 1 V range, Vpeak of the signal is 1.514 V which exceeds the
ADC dynamic range of 1.2 V, causing an error in DC measurement.
Select a higher range DCV 10 V range for better accuracy.
The same error of measurement applies to DCV and ACI dual mode caused by the
multimeter's series burden voltage.

Voltage and current in dual measurement

When measuring DC voltage and DC current in dual measurement mode, take
into account the resistance of the test lead and internal measuring circuitry. The
34450A shares the same common ground both in DC voltage and DC current
measurement. When a current flow through the LO terminal, a voltage drop will
occur in the circuit and will affect the accuracy of the voltage reading.
102
1.2 V
0 V
-1.2 V
ADC Dynamic Range
Keysight 34450A User's Guide