Keithley 2450 User Manual

Section
8: TSP command reference Model 2450 Interactive SourceMeter® Instrument
Reference Manual
8-98 2450-901-01 Rev. B/September 2013
Details
This command sets the number of measurements that are taken when a measurement is requested. This
command does not affect the trigger model.
To get better feedback from the instrument, use the Simple Loop trigger model template instead of
using the count command.
Example 1
reset()
--Set up measure function
smu.measure.func = smu.FUNC_DC_CURRENT
smu.measure.terminals = smu.TERMINALS_REAR
smu.measure.autorange = smu.ON
smu.measure.nplc = 1
smu.measure.count = 200
--Set up source function
smu.source.func = smu.FUNC_DC_VOLTAGE
smu.source.ilimit.level = 0.1
smu.source.level = 20
smu.source.delay = 0.1
smu.source.highc = smu.OFF
--Turn on output and initiate readings
smu.source.output = smu.ON
smu.measure.read(defbuffer1)
--Parse index and data into three columns
print("Rdg #", "Times", "Current (A)")
for i=1, defbuffer1.n do
print(i, defbuffer1.relativetimestamps[i], defbuffer1[i])
end
--Discharge the capacitor to 0 V and turn off the output
smu.source.level=0
delay(2)
smu.source.output=smu.OFF
This example uses smu.measure.count to do a capacitor test. This outputs 200 readings that are similar to
the following output:
Rdg # Times Current (A)
1 0 8.5718931952528e-11
2 0.151875 1.6215984111057e-10
3 0.303727 1.5521139928865e-10
. . .
198 29.91579194 1.5521250951167e-10
199 30.067648716 1.4131290582142e-10
200 30.219497716 1.5521067764368e-10

Keithley 2450 Specifications

General

Model	2450
Category	SourceMeter
Voltage Source Range	±200 V
Current Source Range	±1 A
DC Voltage	200 V
DC Current	1 A
Power Output	20 W
Resolution	6.5 digits
Display	5-inch capacitive touchscreen
Operating Temperature	0°C to 50°C
Connectivity	USB, LAN, GPIB
Dimensions	213 mm × 88 mm × 370 mm