Keithley 4200A-SCS Reference Manual page 364

Model 4200A-SCS Parameter Analyzer Reference Manual
Hold Time
The starting voltages or currents of a sweep may be substantially larger than the voltage or current
increments of the sweep. Accordingly, the source settling time required to reach the starting voltages
or currents of a sweep may be substantially larger than the settling times required to increment the
sweep. To compensate, you can specify a Hold Time delay to be applied at the beginning of each
sweep. You can specify a Hold Time of 0 to 1000 s.
See Choose hold and sweep delay times for CVUs
hold times.
Choose hold and sweep delay times for CVUs
The condition of a device when all internal capacitances are fully charged after an applied step
voltage is referred to as equilibrium.
If capacitance measurements are made before the device is in equilibrium, you may get inaccurate
results.
To choose the delay times for a C-V sweep:
1. Set up conditions of:

Hold time: 0 s

Interval time: 0 s

Presoak: 0 V
2. Step an applied voltage using the sampling mode.
3. Plot the capacitance as a function of time.
4. Observe the settling time from the graph.
5. Use this time for the hold time for the initial applied voltage or for the sweep delay time applied at
each step in the sweep. The sweep delay time may not need to be as long as the first step.
Disable outputs at completion - CVU
When a test is complete, you can disable the outputs or leave them enabled.
When Disable Outputs at Completion is selected, the output turns off (0 V) when the test is complete.
If this option is not selected, the DC Bias voltage remains at the last bias voltage level at the end of
the previous test.
To set output action on completion:
1. Select the test.
2. Select Configure.
3. In the right pane, select the Test Settings tab.
4. Select Advanced.
5. Select or clear Disable Outputs at Completion.
Output Values
You can export the readings from a test to the Analyze sheet for the test or the Analyze sheet for
subsite cycling. You select the values to be exported in the Output Values dialog box. A test can have
up to 20 output values.
If you are using subsites, each time a subsite is cycled, the measurements for the enabled Output
Values are placed in the Analyze sheet for the subsite. For example, if the subsite is cycled five
times, there will be five measured readings (Output Values) for the test. For details, see
cycling (on page 6-181).
4200A-901-01 Rev. C / February 2017
(on page 6-95) for information on determining
Section 6: Clarius
Subsite
6-95