Secondary Measurement Considerations; Dc Voltage Dynamic Range In Secondary Measurement - DATATEC EDU34450A Guia Del Usuario

Secondary Measurement Considerations

The secondary measurements mode allows users to make two measurements in one display. During secondary
measurement mode, the display will show two separate measurements and there is a switching delay between both
measurements.
The table below shows some of the applications that can be measured using secondary measurement mode:
Secondary Function Com-
binations
DCV and ACV
DCV and DCI
DCV and ACI
ACV and DCI
ACV and ACI
ACV/ACI and Freq

DC Voltage Dynamic Range in Secondary Measurement

When measuring DC and AC in dual measurement mode, make sure the DC + AC components do not exceed the
instrument's ADC dynamic range. The instrument has a dynamic range of ±1.2 V or 120% of full scale for each DCV
ranges.
For example, the DC offset of the signal as shown in the figure below causes the input to exceed the upper limit ADC
dynamic range. This may cause errors in DC component measurement.
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 instrument's series burden
voltage.
102
Application
Measure AC signal with DC offset from an amplifier output
Measure AC ripple noise and DC output voltage from a power supply
Measure DC voltage and DC current on a electronic circuit
Inverter application
Inverter application
Measure primary and secondary signal of a transformer circuit
Measure frequency of the line voltage
Keysight EDU34450A User's Guide