Tektronix Keithley 4200A-SCS User Manual

Section 6: Using a Model 82 C-V System Model 4200A-SCS Prober and External Instrument Control
6-14 4200A-913-01 Rev. A December 2020
7. Modify the test parameters as needed. Refer to QTsweep82 user module (on page 6-37) for
parameter definitions.
If you use the parameters shown in the figure below, the Model 82 makes 20 quasistatic
capacitance measurements using 20 mV pulses (V_Step) ranging from 0.07 seconds to
1 second (Delay_Max).
8. Click Run to execute the test.
Figure 90: QTsweep82 user module
Equilibrium test (QTsweep) description
This test performs a quasistatic capacitance measurement (CQS) using 20 different delay times. The
voltage bias and pulse amplitude are held constant during the test. The current (Q / t) at the end of
each reading sample is also calculated (i = Q/t).
The figure below shows the pulse stream for the equilibrium test using the parameters shown in
QTsweep (equilibrium test) (on page 6-13). As shown, the last reading sample uses a set delay
(Delay_Max) of one second, while the first reading sample uses a delay of 70 ms (which is the
minimum). The delay times for the other 18 reading samples are then automatically set. After the first
pulse, each subsequent pulse delay time increases logarithmically in progression up to the maximum
delay (Delay_Max).

Tektronix Keithley 4200A-SCS Specifications

General

Brand	Tektronix
Model	Keithley 4200A-SCS
Category	Measuring Instruments
Language	English