Tektronix Keithley SourceMeter 2450 User Manual page 86

Section 8: Rechargeable battery measurements
SMU
command or
pseudocode
SMU
command
Pseudocode iteration = 1
SMU
command
Pseudocode
SMU
command
8-8
Commands
*RST
OUTP:SMOD HIMP
SENS:RES:RSEN ON
SOUR:FUNC VOLT
SOUR:VOLT 1
SOUR:VOLT:READ:BACK ON
SOUR:VOLT:RANG 2
SOUR:VOLT:ILIM 460e-3
SENS:FUNC "CURR"
SENS:CURR:RANG 1
OUTP ON
voltLimit = 1.0
current = []
voltage = []
seconds = []
hours = []
while true do:
current[iteration] = READ?
"defbuffer1"
voltage[iteration] = TRAC:DATA?
iteration, iteration,
"defbuffer1", SOUR
seconds[iteration] = TRAC:DATA?
iteration, iteration,
"defbuffer1", REL
hours[iteration] =
seconds[iteration]/3600
print(voltage[iteration],
current[iteration],
hours[iteration])
if voltage[iteration] <=
voltLimit then:
break
end if
iteration = iteration + 1
delay(10)
end while
OUTP OFF
Model 2450 SourceMeter® Instrument User's Manual
Description

Reset the instrument.

Turn on high-impedance output mode.

Set to 4-wire sense mode.

Set to source voltage.

Set source level to 1 V.

Turn on source readback.

Set source range to 2 V.

Set the source limit to 460 mA.

Set to measure current.

Set current range to 1 A.

Turn the output on.

Create a variable called iteration
and initialize to 1.

Create a variable called voltLimit
and initialize to 1.

Create an empty array for current
measurements.

Create an empty array for voltage
measurements.

Create an empty array for the time
values.

Start a while loop.

Append the current reading to the
array current.

Append the voltage reading to the
array voltage.

Append the time reading to the array
seconds.

Calculate the hours taken at each
iteration.

Print the measured values.

Compare the voltage reading from this
iteration to the voltage limit. If the
measured value is less than or equal
to the limit, break out of the loop.

End the if statement.

Increment the iteration count by 1.

Delay for 10 seconds.

End the while loop.

Turn the output off.
2450-900-01 Rev. E / August 2019