Keithley 4200A-SCS Reference Manual page 1006

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Model 4200A-SCS Parameter Analyzer Reference Manual

This command sets the pulse width for pulse output.

int pulse_width(int instr_id, long chan, double width);

Use the pulse_source_timing command to set the pulse width for the 4220-PGU and 4225-

You can set the pulse width independently for each pulse card channel. The pulse_range

command is used to set pulse speed.

Pulse card pulse width is based on the full width at half-maximum method (FWHM). As shown below,

the pulse width is measured at the median (50 percent amplitude) point from the rising edge of the

pulse to the falling edge of the pulse.

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

The instrument identification code of the pulse card, such as VPU1 or VPU2

Channel number of the pulse card: 1 or 2

Pulse width in seconds:

Fast speed (5 V): 10e-9 to (Period − 10e-9)

Slow speed (20 V): 250e-9 to (Period − 10e-9)

Default: 500e-9

Section 13: LPT library function reference