Agilent Technologies B1500A Uživatelská příručka stáhnout pdf (Strana 175)

100

101

Agilent B1500 User’s Guide, Edition 7 3- 45

Installation

Connecting Measurement Devices

To Measure Low Resistance

When you measure a low resistance, high current flows through the DUT. This high

current increases the measurement error caused by the residual resistance of cables.

To cancel the effect of this resistance, you can use Kelvin connections (4-wire),

which means the force and sense lines are extended separately to the DUT.

Connect the probing needles to the terminals of the connect

or plate by using test

leads or coaxial cables. Following instruction uses the coaxial cables:

1. At end of cable, connect coaxial center conductor to force terminal

of connector

plate, and connect coaxial outer conductor to guard terminal of connector plate.

2. At another end, connect coaxial center conducto

r to tail of the probing needle.

Never connect the outer conductor at this cable end.

Extend the outer conductor as close as possible to the probing needle.

3. Repeat 1 and 2 for the sense terminal of connector plate.

4. Contact the probing needles from force and s

ense terminals as

close as possible

to the DUT.

Example

The following example connection can be used to measure low

resistance. The sense

line is extended to the probing pad, and contacts the force line through the pad, so

the voltage drop due to the residual resistance caused by cables and test leads is

canceled.

This example uses test leads. To reduce the leakage current, use co

axial cables.

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&RQWDFWSDG

&RQQHFWRUSODWH

)RUFH

6HQVH

&RQWDFWSDG

1 2 ... 170 171 172 173 174 175 176 177 178 179 180 ... 627 628

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