Keithley 4200A-SCS Reference Manual page 353

Section 6: Clarius
Delay Factor
After applying a voltage or current, the instrument waits for a delay time before making a
measurement. The delay time allows for source settling. The Delay Factor adjusts the delay time for
the selected speed. It is fixed for Fast, Normal, and Quiet speeds. If you select Custom Speed, you
can type a factor from 0 to 100.
The applied delay time is a multiple of the default delay time. The Delay Factor specifies this multiple.
That is:
Applied delay time = (Default delay time) x (Delay Factor)
For example, if the default delay time is 1 ms and the Delay Factor is 0.7, the actual applied delay
time is 0.7 ms (1 ms x 0.7).
The following table summarizes the Delay Factor settings.
Speed Mode
Fast
Normal
Quiet
Custom
When typing a custom Delay Factor setting, consider the following:
•
A Delay Factor of 1 allows for a normal amount of settling before the A/D converter is triggered to
make a measurement.
•
Each doubling of the Delay Factor doubles the time allowed for settling.
•
A delay factor of 0 multiplies the default delay by zero, resulting in no delay.
If you set the Filter Factor and Delay Factor to 0, the internal pre-programmed values are ignored.
In general, cables and matrices increase the settling time. You may need to experiment to find the
ideal time. However, for a good quality switch, such as the Keithley Instruments 7174A Ultra-Low
Current matrix, you should not need to increase the Delay Factor by more than two times.
6-84
Delay Factor
0.7
1.0
1.3
0 to 100
Model 4200A-SCS Parameter Analyzer Reference Manual
4200A-901-01 Rev. C / February 2017