4: Multi-frequency capacitance-voltage unit Model 4200A-SCS Parameter Analyzer
4-26 4200A-901-01 Rev. C / February 2017
CVU using voltage sweep
The following figure shows the Advanced terminal settings for a voltage linear sweep. This sweep
measures Cp-Gp.
Figure 105: CVU voltage sweep
When this test is run, the following force-measure sequence occurs:
1. The DC source goes to the presoak voltage of -5 V for the hold time.
2. The DC bias voltage goes to the first step of the sweep (1 V).
3. After the built-in system delay and sweep delay, the 4210-CVU makes a measurement. The AC
test signal is applied before the start of the measurement. AC drive is turned off after the
measurement is made.
4. Steps 2 and 3 are repeated for the 2 V and 3 V DC bias voltage steps. The sweep delay repeats
at the beginning of each subsequent step.
The sweep delay and hold time are set from the Test Settings.
To do a dual CVU voltage sweep, select Dual Sweep in the Terminal Settings pane. If Dual Sweep is
selected, after the stop step is measured, the sweep continues in the reverse direction. For the
settings shown in the above figure, the dual sweep steps through 1 V, 2 V, 3 V, 3 V, 2 V, and 1 V.
The number of measurements doubles to six.
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