Fo rc e -S e n s e S w it c h e s
12-WIRE PRECISION SOURCE-MONITOR
+ FORCE-SENSE AMPLIFIER
V+
CURRENT SENSE
V
TRIAX CABLE
+FORCE
+GUARD
GROUND
V-
V+
LEAKAGE CURRENT
LEAKAGE CURRENT
V-
TRIAX CABLE
+ FORCE-GUARD AMPLIFIER
V+
+SENSE
+GUARD
GROUND
+SENSE
GUARD AMPLIFIER
V-
V+
V-
VOLTAGE SOURCE
LOAD
(OPTIONAL GROUND)
LEAKAGE CURRENT
/MAX456
V+
- SENSE-GUARD AMPLIFIER
GROUND
- GUARD
-SENSE
V-
- FORCE-GUARD AMPLIFIER
V+
TRIAX CABLE
LEAKAGE CURRENT
V+
V-
GROUND
- GUARD
- FORCE
V +
TRIAX CABLE
V
TRIAX CABLE/CONNECTOR
CENTER WIRE (FORCE/SENSE)
CURRENT SENSE
INNER SHEILD (GUARD)
OUTER SHEILD (GROUND)
V-
- FORCE-SENSE AMPLIFIER
Figure 4. 12-Wire Guarded Force-Sense Measurements
18 ______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
