Sweepf - Keithley 4200A-SCS Reference Manual

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Section 13: LPT library function reference

sweepf

This command performs a frequency sweep.

int sweepf(int instr_id, double startf, double stopf, long *NumPts, double

This command is used to perform a frequency sweep. The 4210-CVU provides test frequencies from

1 kHz to 10 MHz in the following steps:

1 kHz through 10 kHz in 1 kHz steps

10 kHz to 100 kHz in 10 kHz steps

100 kHz to 1 MHz in 100 kHz steps

1 MHz to 10 MHz in 1 MHz steps

The frequency points to sweep are set using the startf and stopf parameters. If an entered value

is not a supported frequency, the closest supported frequency will be selected (for example, 15 kHz

input will select 20 kHz). The sweep can step forward (low frequency to high frequency) or it can step

in reverse (high frequency to low frequency).

When the sweep is started, the 4210-CVU steps through all the supported frequency points from start

to stop. For example, if the start frequency is 800 kHz and the stop frequency is 3 MHz, the CVU

steps through the following frequency points: 800 kHz, 900 kHz, 1 MHz, 2 MHz, 3 MHz.

The NumPts query returns the total number of sweep points. For the above example, NumPts

The delayTime parameter sets the delay that occurs before each measurement. Note that there is

an inherent system overhead delay on each frequency step of the sweep.

Use the forcev command to set the DC bias level and setlevel command to set the AC drive

Use the dsweepf command to perform a dual frequency sweep.

The instrument identification code of the 4210-CVU: CVU1

Initial frequency for the sweep

Final frequency for the sweep

Query the number of sweep points

Delay before each measurement (0 to 999 s)

Model 4200A-SCS Parameter Analyzer Reference Manual

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