RS PRO RSDM-9060, User Manual

Page: 85 / 412

85
DC Voltage and
Temperature
Measurement
(Sense HI/LO
connects to K-
Type +/-, whilst
Input HI/LO
connects DCV
source)
DC Current and
Temperature
Measurement
(Sense HI/LO
connects to K-
Type +/-, whilst
Input 3A/LO
connects DCI
source)
The error influence on Dual Measurement (V & I)
Background
While dual measurement of voltage and current is
being executed, the route from DMM internal
circuit to the LO terminal circuit for measuring
voltage is totally identical with that for measuring
current, and thus the resistor within the route is
commonly shared by the two measuring circuits.
While measuring current, the resistor within the
circuit will generate a voltage drop. When the
internal resistor of LO terminal is added to the
external load resistor within the circuit, the
accuracy of voltage reading will be influenced.