Agilent Technologies B1500A User's Guide download pdf (Page 127)

Keysight B1500A User’s Guide, Ed ition 14 3- 49

Installation

Connecting Measurement Devices

WARNING To prevent electrical shock and DUT damage, do not connect or disconnect the

DUT while the instrument is applying voltage or current.

When you touch the DUT after measurement, devise a countermeasure of

residual charge and heat to prevent electrical shock and burn. Use glove and

any tool. Also have enough time for discharge and radiation.

Kelvin Connection (Remote Sensing)

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

The following figure shows the equivalent circuits for Kelvin and non-Kelvin

connections.

• For the non-Kelvin connection, the voltmeter measures the voltage drop 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 voltage. 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  or less. Therefore, the specified

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

(a) non-Kelvin connection

(b) Kelvin connection

DUT

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Agilent Technologies B1500A User's Guide Page 127