What Is Offset Compensation? - Keithley 2450 Reference Manual

Section 9: Frequently asked questions (FAQs)

What is offset compensation?

Offset compensation is a measuring technique that reduces or eliminates thermal EMFs in low level
resistance measurements. The voltage offsets because of the presence of thermal EMFs (V
adversely affect resistance measurement accuracy.
To overcome these offset voltages, you can use offset-compensated ohms.
What is a configuration list?
A configuration list is a list of stored instrument settings. You can restore these instrument settings to
change the active state of the instrument. Configuration lists allow you to record the active state of the
instrument, store it, and then return the instrument to that state as needed.
If you are using TSP, configuration lists run faster than a script that is set up to configure the same
settings.
The Model 2450 supports source configuration lists and measure configuration lists, making it
possible to sequence through defined source settings, measurement settings, or both.
Each configuration list consists of a list of configuration points. A configuration point contains all
instrument source or measure active settings at a specific point. You can cycle through the
configuration points using a trigger model.
For more detail, see
Why do I see the "incompatible settings" message?
The "Continuous measurements have been terminated because of incompatible settings" message
indicates that the combination of settings that are presently configured make it impossible for the
instrument to make a valid measurement.
To resolve this problem, make changes to your settings.
How do I use the digital I/O port?
You can use the Model 2450 digital input/output with the trigger model or to control an external digital
circuit, such as a device handler used to perform binning operations. To control or configure any of
the six digital input/output lines, send commands to the Model 2450 over a remote interface.
To use the Model 2450 digital I/O in a trigger link system (TLINK), connect it using a Model
2450-TLINK Trigger Link Cable and configure the Model 2450 digital input and output lines.
For more information about the Model 2450 digital I/O port, see
9-14
Model 2450 Interactive SourceMeter® Instrument Reference Manual
Configuration lists (on page 3-33).
Digital I/O (on page 3-62).
2450-901-01 Rev. B/September 2013
) can
EMF