Agilent Technologies B1500A Training Manual page 58

Class Exercise
Bipolar Re Using A Kelvin SMU
You will connect a Kelvin triax cable to the B1500A
You will then connect jumper leads and the bipolar device
You will get the REKELV setup
You will observe Re using Kelvin and Non-Kelvin connections.
Why is the Non-Kelvin error so large?
To Get Started:
Use the next several pages as you guide
Verify that all triax cables are connected properly
Connect four jumper leads to the 28 pin socket as shown
Insert the bipolar transistor (not static sensitive)
The purpose of this class exercise is to familiarize yourself with making a Kelvin measurement. Low
resistance measurements such as Re, Rc (bipolar) or Rs, Rd (MOS) are excellent examples because
the resistances are of the same approximate magnitude as cable resistances. Kelvin techniques must
be used, or your error can be as much as 100 %.
The next several pages lead you through the steps of connecting a Kelvin cable, making the correct
Force/Sense jumper lead connections, orienting the device properly in the socket, and getting the
REKELV algorithm. The measurement will be Re (emitter resistance) of a bipolar transistor. You
will be able to remove the Sense jumper lead on the Emitter terminal of the device to see the gross
measurement degradation when the connection is non-Kelvin (no sense connection near the device).
5-38
Module 5
Basic Measurement