Keithley 4200A-SCS User Manual

Model 4200A-SCS Pulse Card (PGU and PMU) User's Manual Section 4: Pulse card concepts
4200A-PMU-900-01 Rev. A December 2020 4-19
Example 4: Maximum voltage and current, high speed range
V = I * R
V
MAX
= 10 V for high speed range
R
DUT
= 5 Ω
I
MAX
= V
MAX
/ R
TOTAL
= V
MAX
/ (R
pulse generator
+ R
DUT
)
I
MAXDUT
= 10 V / (50 Ω + 5 Ω) = 10 V / 55 Ω = 0.182 A
V
MAXDUT
= I
MAX
* R
DUT
= 0.182 A * 5 Ω = 0.91 V
These I
MAX
and V
MAX
values match the values in the Pulse Card High Voltage (5 V) Range table for
the 5 Ω row (see following table). These calculations do not incorporate any cabling or interconnect
losses that may range from 1 Ω up to 10 to 20 Ω, depending on the interconnect method and DUT
type (packaged or on-wafer).
Example 5: Maximum voltage and current, high voltage range
V = I * R
V
MAX
= 40 V for High Voltage Range
R
DUT
= 250 Ω
I
MAX
= V
MAX
/ / R
TOTAL
= V
MAX
/ (R
pulse generator
+ R
DUT
)
I
MAXDUT
= 40 V / (50 Ω + 250 Ω) = 40 V / 300 Ω = 0.133 A
V
MAXDUT
= I
MAX
* R
DUT
= 0.133 A * 250 Ω = 33.3 V
These I
MAX
and V
MAX
values match the values in the Pulse Card High Voltage (20 V) Range table for
the 250 Ω row. These calculations do not incorporate any cabling or interconnect losses that may
range from 1 Ω up to 10 to 20 Ω, depending on the interconnect method and DUT type (packaged or
on-wafer).
The tables below show the maximum current and voltage for various R
DUT
values for the two output
ranges available on each pulse card channel. Note the calculated current and voltage values do not
include any cabling or interconnect losses that reduce both the maximum available V
DUT
and I
DUT
.
Because V
DUT
is a function of the load applied to the pulse card channel, this effect is sometimes
called the load-line effect. There are several ways of working with this effect. The simplest one is to
program the DUT load into the pulse card channel using the pulse_load function, or setting the
Pulse Load value in the KPulse (on page 5-1) virtual front panel. The pulse card will calculate the
appropriate V
INT
to output so that the V
DUT
pulse waveform, specified by pulse_vlow and
pulse_vhigh, has the correct levels. For details, see Coping with the load-line effect (on page 2-24).
For descriptions of the LPT functions, refer to Model 4200A-SCS LPT Library Programming.

Keithley 4200A-SCS Specifications

General

Brand	Keithley
Model	4200A-SCS
Category	Measuring Instruments
Language	English