Pulse_Rise - Keithley 4200A-SCS Reference Manual

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Section 13: LPT library function reference

pulse_rise

This command sets the rise transition time for the pulse card pulse output.

int pulse_fall(int instr_id, long chan, double riset);

Rise and fall transition time can be set independently for each pulse card channel. There is a

minimum slew rate for both the rise and fall transitions. For the fast speed range, the minimum is

362 µV/µs, or 1 V/2.7 ms. For the high-voltage range, the minimum slew rate is 1.8 mV/µs, or

1 V/500 µs. The pulse_range command is used to set pulse speed.

As shown below, the pulse rise time occurs between the 0 percent and 100 percent amplitude points

on the rising edge of the pulse, where the amplitude is the difference between the V High and V Low

pulse values.

The pulse rise time setting takes effect immediately during continuous pulse output. Otherwise, the

rise time setting takes effect when the next trigger is initiated. The pulse_trig command is used to

trigger continuous or burst output.

For slow speed, note that the minimum transition time for pulse source only (no measurement) on the

40 V range is 50 ns for the 4225-PMU and 4220-PGU.

Use the pulse_source_timing command to set the pulse fall time for the 4220-PGU and

pulse_rise(VPU1, 1, 50e-9)

For fast speed, the sets the pulse rise time for channel 1 of the pulse card to 50 ns.

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

Channel number of the pulse card: 1 or 2

Pulse rise time in seconds (floating point number):

Fast speed: 10e-9 to 33e-3

Slow speed, 4220-PGU and 4225-PMU: 50e-9 to 33e-3

Default: 100e-9

Model 4200A-SCS Parameter Analyzer Reference Manual

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