Agilent Technologies B1500A Betriebsanweisung PDF herunterladen (Seite 176)

100

101

3- 46 Agilent B1500 User’s Guide, Edition 7

Installation

Connecting Measurement Devices

Kelvin Connection

Kelvin connections give good measurement results when you force high-current.

The followin

g figure shows the equivalent circuits for Kelvin and non-Kelvin

connections.

• For the non-Kelvin connection, the voltmeter measures the voltage dro

p of

resistances r

, R

DUT

, and r

• For the Kelvin connection, the voltmeter measures the voltage drop of resistance

DUT

only. The impedance of the voltmeter is very high, so the voltage drop of

resistances r

and r

can be ignored.

The Kelvin connection is effective even when forcing vol

tage. The voltage drop due

to the residual resistance of the force line wiring is fed back to the voltage source via

a comparator in the sense line. The input impedance of comparator is high, and

current flow into the sense line is very low. So output error is not significant if the

sense line wiring has a residual resistance of 10 Ω or less. Therefore, the specified

voltage appears at the sense point (point where sense line contacts force line)

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