Datasheet

MAX4554/MAX4555/MAX4556

Force-Sense Switches

16 ______________________________________________________________________________________

Figure 2. 3-Wire and 5-Wire Guarded Measurements

GUARD AMPLIFIER

DRIVEN GUARD

(COAX CABLE SHIELD)

VOLTAGE OR

CURRENT SOURCE

SENSE

VOLTAGE OR

CURRENT

GUARD AMPLIFIER

VOLTAGE OR

CURRENT SOURCE

SENSE

VOLTAGE OR

CURRENT

BASIC 3-WIRE GUARD CIRCUIT

SIGNAL

GUARD

GROUND

TRIAX CABLE

LEAKAGE

CURRENT

3-WIRE GUARD CIRCUIT USING TRIAX

TRIAX CABLE/CONNECTOR

CENTER WIRE

INNER SHEILD

OUTER SHEILD

LEAKAGE

CURRENT

LEAKAGE

CURRENT

LEAKAGE

CURRENT

GUARD AMPLIFIER

DRIVEN GUARD

(COAX CABLE SHIELD)

DRIVEN GUARD

(COAX CABLE SHIELD)

VOLTAGE OR

CURRENT SOURCE

SENSE

VOLTAGE

OR CURRENT

BALANCED 5-WIRE GUARD CIRCUIT