Keithley 4200A-SCS Reference Manual page 355

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Section 6: Clarius

The applied A/D conversion time also depends on the Filter Factor setting:

If the Filter Factor is not zero, the SMU or CVU applies an optimum A/D converter time that is

based on the Filter Factor setting. The applied A/D converter time value is never less than the

specified A/D Aperture Time.

If the Filter Factor setting is zero, the SMU or CVU applies a fixed A/D converter time that equals

the specified A/D Aperture Time.

The Auto A/D Aperture and A/D Aperture Time settings for each Speed Mode are shown in the

following table.

Test Mode (SMU and CVU)

You can set a test to the sweeping or sampling test mode.

Sweeping test mode is used for tests in which the voltage, current, or frequency varies with time.

Sampling Mode allows you to measure voltages or currents as a function of time while forcing

constant voltages or currents. The sampling test mode is used for tests in which the forced voltage

and frequency are static, with measurements made at timed intervals. For example, you could use

sampling mode to profile a capacitor charging voltage while forcing a constant current. Time is

measured relative to when the instruments apply the forced voltage or current (that is, t = 0 at the

step change from 0.0 V or 0.0 A to the applied voltage or current).

When Sampling Mode is selected, all device terminals are set to a static operation mode, such as

Open or Voltage Bias.

Operation mode timing diagrams

If you are using a sweep operation mode and need extra settling time before each measurement, you

can specify an additional delay with the Sweep Delay. The Sweep Delay is independent of the

(on page 6-84). You can specify a Sweep Delay from 0 s to 999 s. The default Sweep Delay is

Sampling mode only. The time between measurements (data points). Interval can be set from 0 s to

Number of Samples

Specifies the number of data points to be acquired. Set the number of samples to a value from 1 to

A/D Aperture Time

0.01 to 10 PLC

Model 4200A-SCS Parameter Analyzer Reference Manual

(on page 3-36) for additional detail.

4200A-901-01 Rev. C / February 2017