Model 4200A-SCS Parameter Analyzer Reference Manual
Section 13: LPT library function reference
4200A-901-01 Rev. C / February 2017
13-81
pulseX
This command directs a SMU to force a voltage or current at a specific level for a predetermined length of time.
Usage
int pulsei(int
instr_id
, double
forceval
, double
time
);
int pulsev(int
instr_id
, double
forceval
, double
time
);
instr_id
The instrument identification code
forceval
The level of voltage in volts or current in amperes to force; see
Details
time
The pulse duration in seconds; for example, a time of 0.5 initiates a time of 0.5 s,
and a time of 2.0e-2 initiates a time of 20 ms; the minimum practical time for a
source-measure unit (SMU) source is dependent on the voltage or current level
being sourced and the impedance of the device under test (DUT)
Details
The
forceval
parameter can be positive or negative. For example, sending
pulsev(SMU1,
10.0, 10e-3)
gen10 V for 10 ms, and sending
pulsei(SMU1, -1.5e-3, 10e-3)
generates -1.5 mA for 10 ms.
The ranges of current and voltage available vary with the instrument type. For more detailed
information, refer to the hardware manuals of the instruments in your system.
After
pulseX
is executed, the output is turned off. In order to make measurements, the output must
be turned back on.
measX
can measure:
•
Residual voltage or current as it decays after removal of the initial application.
•
Capacitance between DUT pins as the residual voltage or current decays.
All measurements made using the
pulse
X
and
meas
X
commands are made after the pulse has
completed.
When the source is not operating, measurements are not allowed.
Whenever
pulse
X
is executed, either a default or a programmed current or voltage limit is in effect.
Refer to the
limitX
(on page 13-75) command for additional information.
When using
limit
X
,
range
X
, and
pulse
X
on the same source at the same time in a test sequence,
call
limit
X
, then
range
X
, then
pulse
X
.
Note that changing the source mode of the SMU can modify the measure range. If the sourcing mode
is changed from voltage to current sourcing (or from current to voltage sourcing), the measure range
may be changed to minimize variations in the SMU output level. See
(on page 13-83) for
recommended command order.
