Keithley 2461 - Page 829

Section
8: TSP command reference Model 2461 Interactive SourceMeter® Instrument
Reference Manual
8-156 2461-901-01 A/November 2015
Example
This example enables limits 1 and 2 for voltage, measurements. Limit 1 is checking for readings to be
between 3 and 5 V, while limit 2 is checking for the readings to be between 1 and 7 V. The auto clear
feature is disabled, so if any reading is outside these limits, the corresponding fail is 1. Therefore, if
any one of the fails is 1, analyze the reading buffer data to find out which reading failed the limits.
reset()
-- set the instrument source current
smu.source.func = smu.FUNC_DC_CURRENT
-- set the instrument to measure voltage
smu.measure.func = smu.FUNC_DC_VOLTAGE
-- set the range to 10 V
smu.measure.range = 10
-- set the nplc to 0.1
smu.measure.nplc = 0.1
-- disable auto clearing for limit 1
smu.measure.limit[1].autoclear = smu.OFF
-- set high limit on 1 to fail if reading exceeds 5 V
smu.measure.limit[1].high.value = 5
-- set low limit on 1 to fail if reading is less than 3 V
smu.measure.limit[1].low.value = 3
--- set the beeper to sound if the reading exceeds the limits for limit 1
smu.measure.limit[1].audible = smu.AUDIBLE_FAIL
-- enable limit 1 checking for voltage measurements
smu.measure.limit[1].enable = smu.ON
-- disable auto clearing for limit 2
smu.measure.limit[2].autoclear = smu.OFF
-- set high limit on 2 to fail if reading exceeds 7 V
smu.measure.limit[2].high.value = 7
-- set low limit on 2 to fail if reading is less than 1 V
smu.measure.limit[2].low.value = 1
-- enable limit 2 checking for voltage measurements
smu.measure.limit[2].enable = smu.ON
-- set the measure count to 50
smu.measure.count = 50
-- create a reading buffer that can store 100 readings
LimitBuffer = buffer.make(100)
-- make 50 readings and store them in LimitBuffer
smu.measure.read(LimitBuffer)
-- Check if any of the 50 readings were outside of the limits
print("limit 1 results = " .. smu.measure.limit[1].fail)
print("limit 2 results = " .. smu.measure.limit[2].fail)
-- clear limit 1 conditions
smu.measure.limit[1].clear()
-- clear limit 2 conditions
smu.measure.limit[2].clear()