Simpson 460 4 Series - Basic DC Current and Resistance

Theory of Operation
CURRENT RANGE SWITCHES
(with "make" before "break" contacts)
A/D
CONVERTER ova
10A o
COMMON o ANALOG
DISPLAY
Rr
CONSTANT
CURRENT
SOURCE
200mv
= A/D
о CONVERTER
NUMERICAL
DISPLAY
ANALOG
DISPLAY
Figure 5-3. Basic DC Current and Resistance Measurement Circuits
cycle is filtered and the resulting DC voltage is measured by the
A/D Converter.
5.3.11 The indications of the numerical display are calibrated to
the rms sine wave value being measured.
5.3.12 DC Current Measurements
5.3.13 The basic DC current measurement circuit is shown in
Figure 5-3(a).
5.3.14 The current being measured is connected in series with the
COMMON and the mA (or 10A) jacks and an internal preci-
5-5