Fluke 19xC - Page 104

Fluke 19xC-2x5
Users Manual
94
Figure 54. Parasitic capacitance between probes,
instrument and environment
M
MOTION/MOTOR CONTROLLER
DC BUS
DC BUS
DIGITAL
GROUND
+
-
Figure 55. Parasitic capacitance between analog and
digital reference
A
NAL
OG
INPUT DI
G
ITAL
CO
NTR
O
LLER
ANALOG
GROUND
DIGITAL
GROUND
Figure 56. Correct connection of reference leads
A
NAL
OG
INPUT DI
G
ITAL
CO
NTR
O
LLER
ANALOG
GROUND
DIGITAL
GROUND
Figure 57. 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.