Keithley 2450 User Manual

Model 2450
Interactive SourceMeter® Instrument Reference Manual Section 3:
Functions and features
2450-901-01 Rev. B/September 2013 3-75
TRIGger:LOAD:EMPTy
TRIGger:BLOCk:BUFFer:CLE 1, "defbuffer1"
TRIG:BLOC:WAIT 2, DIG5
TRIG:BLOC:SOUR:STAT 3, ON
TRIG:BLOC:DEL:CONS 4, 0.001
TRIG:BLOC:MEAS 5, "defbuffer1"
TRIG:BLOC:SOUR:STAT 6, OFF
TRIG:BLOC:BRAN:LIM:CONS 7, IN, 80, 120, 10, 5
TRIG:BLOC:DIG:IO 8, 15, 15
TRIG:BLOC:BRAN:ALW 9, 20
TRIG:BLOC:BRAN:LIM:CONS 10, IN, 90, 110, 13,
5
TRIG:BLOC:DIG:IO 11, 1, 15
TRIG:BLOC:BRAN:ALW 12, 20
TRIG:BLOC:BRAN:LIM:CONS 13, IN, 95, 105, 16,
5
TRIG:BLOC:DIG:IO 14, 2, 15
TRIG:BLOC:BRAN:ALW 15, 20
TRIG:BLOC:BRAN:LIM:CONS 16, IN, 99, 101, 19,
5
TRIG:BLOC:DIG:IO 17, 3, 15
TRIG:BLOC:BRAN:ALW 18, 20
TRIG:BLOC:DIG:IO 19, 4, 15
TRIG:BLOC:DEL:CONS 20, 0.001
TRIG:BLOC:DIG:IO 21, 0, 15
TRIG:BLOC:NOT 22, 1
TRIG:BLOC:BRAN:COUN 23, 10, 2
Clear any existing trigger model commands from the
instrument.
Set up the trigger model:
• Block 1: Clear default buffer 1.
• Block 2: Set up a wait block to wait for digital
line 5.
• Block 3: Turn the source output on.
• Bock 4: Set a constant delay of .001 seconds.
• Block 5: Make a measurement and store it in
default buffer 1.
• Block 6: Turn the output off.
• Block 7: Set up the constant limits to perform
the first test.
• Block 8: If block 7 fails, drive the digital I/O lines
high.
• Blocks 9, 12, 15, and 18: Branch to block 20.
• Block 10: Set up the constant limits to perform
the second test.
• Block 11: If block 10 fails, drive line 1 high.
• Block 13: Set up the constant limits to perform
the third test.
• Block 14: If block 13 fails, drive line 2 high.
• Block 16: Set up the constant limits to perform
the fourth test.
• Block 17: If block 10 fails, drive lines 1 and 2
high.
• Block 19: If block 10 fails, drive line 3 high.
• Block 20: Delay for 1 ms
• Block 21: Set all digital lines low.
• Block 22: Send out a notify event to indicate
that the test has ended.
•
Block 23: Return to block 2 23 times.
Resistor grading TSP code
local number_of_resistors = 100
-- Reset instrument to default settings
reset()
-- Measure function must be first measure setting;
-- most other settings are tied to the function
smu.measure.func = smu.DC_VOLTAGE
smu.measure.unit = smu.UNIT_OHM
-- Use 4-wire or "remote" voltage sensing
smu.measure.sense = smu.SENSE_4WIRE
-- Measure the actual value of the source for higher accuracy
smu.source.readback = smu.ON
-- Set measurement integration time to 1PLC (16.67ms at 60Hz)
-- Decrease to reduce test time; trade off accuracy for speed
smu.measure.nplc = 1
-- Immediately update autozero reference measurements and then disable autozero
function
smu.measure.autozero.once()

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