Fluke ScopeMeter 192B - Page 84

Fluke 192B - 196B/C - 199B/C
Users Manual
76
Figure 42. Parasitic capacitance between probes,
instrument and environment
M
MOTION/MOTOR CONTROLLER
DC BUS
DC BUS
DIGITAL
GROUND
+
-
Figure 43. Parasitic capacitance between analog and
digital reference
A
NAL
OG
INPUT DI
G
ITAL
CO
NTR
O
LLER
ANALOG
GROUND
DIGITAL
GROUND
Figure 44. Correct connection of reference leads
A
NAL
OG
INPUT DI
G
ITAL
CO
NTR
O
LLER
ANALOG
GROUND
DIGITAL
GROUND
Figure 45. 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.