Keithley 4200A-SCS

Model 4200A
-SCS Parameter Analyzer Reference Manual Section 13:
LPT library function reference
4200A-901-01 Rev. C / February 2017 13-161
pulse_width
This command sets the pulse width for pulse output.
Usage
int pulse_width(int instr_id, long chan, double width);
instr_id
The instrument identification code of the pulse card, such as
VPU1
or
VPU2
chan
Channel number of the pulse card:
1
or
2
width
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
Pulse modes
Standard
Details
Use the pulse_source_timing command to set the pulse width for the 4220-PGU and 4225-
PMU.
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.