Keithley 4200-SCS Reference Manual page 691

Model 4200-SCS Reference Manual
pulse_width Sets pulse width
Purpose
Format
Remarks
Figure 8-115
pulse_width
See also
Example
4200-901-01 Rev. S / May 2017
This function sets the pulse width for pulse output.
int pulse_width(INSTR_ID instr_id, long chan, double width)
instr_id
chan
width
Pulse width can be independently set for each PG2 channel. For fast speed, pulse
width can be set from 10 ns to (Period - 10 ns). For slow speed, pulse width can be set
from 250 ns to (Period - 10 ns). The
PG2 pulse width is based on the full width, half max 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.
V High
50%
V Low
The maximum pulse width that can be set depends on the presently set period for the
pulse. For example, if the period is set for 500 ns, the maximum pulse width that can be
set is 490 ns (500 ns - 10 ns = 490 ns).
The pulse width setting takes effect immediately during continuous pulse output.
Otherwise, the width setting takes effect when the next trigger is initiated. The
function is used to trigger continuous or burst output.
pulse_trig
NOTE Use the
pulse_source_timing
Models 4220-PGU and 4225-PMU.
pulse_period
The following function sets the pulse width for channel 1 to 250 ns:
pulse_width(VPU1, 1, 250e-9)
Return to Section Topics
Section 8: Keithley User Library Tool (KULT)
Instrument ID of the PG2: VPU1, VPU2, and so on.
Channel number of the PG2: 1 or 2.
Pulse width in seconds
Fast speed: 10 e-9 to (Period - 10 e-9)
Slow speed: 250 e-9 to (Period - 10 e-9)
Default: 500 e-9
pulse_range
Pulse Width
function to set the pulse width for the
function is used to set pulse speed.
8-175