Agilent Technologies 4156b, User Manual, Page: 382 / 414

8-8 Agilent 4155B/4156B User’s Guide Vol.2, Edition 5
If You Have A Problem
When You Make A Measurement
If Measured Voltage has some Error when Forcing a
Large Current
Voltage measurement may have some error because of the effects of the cable
resistance when forcing a large current.
To solve this problem:
• Use Kelvin connections between SMUs and DUT. To cancel the effects of cable
resistance, connect the sense line as close as possible to the terminal of the DUT.
For details of Kelvin connections, see “Connection to Device Under Test
(DUT)” in Chapter 4
If Large Current Causes High Temperature (Thermal
Drift)
If a large current is forced to a DUT, the temperature of the DUT may increase,
which may cause characteristics to drift.
To solve this problem:
• Use the pulse output mode of the SMU.
For large currents, the SMU should be set to pulse output mode. This decreases
the average power output to prevent temperature rise of DUT.