User`s guide

82 34450A User’s Guide
3 Measurement Tutorial
Figure 3-3 ADC Dynamic Range
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.
1.2 V
0 V
-1.2 V