Fluke 196 - Page 77

Tips
Using the Independently Floating Isolated Inputs
7
69
Figure 44. Parasitic capacitance between probes,
instrument and environment
M
MOTION/MOTOR CONTROLLER
DC BUS
DC BUS
DIGITAL
GROUND
+
-
Figure 45. Parasitic capacitance between analog and
digital reference
ANALOG INPUT
DIGITAL CONTROLLER
ANALOG
GROUND
DIGITAL
GROUND
Figure 46. Correct connection of reference leads
ANALOG INPUT
DIGITAL CONTROLLER
ANALOG
GROUND
DIGITAL
GROUND
Figure 47. Wrong connection of reference leads
Noise that is picked up by reference lead B can be
transmitted by parasitic capacitance to the analog input
amplifier.