Tektronix KEITHLEY SourceMeter 2400 Series Calibration And Adjustment Manual page 22

Model 2461 Calibration and Adjustment Manual
3. Complete the calibration steps listed in the following table for each current range. For each
current range, perform the complete procedure at 95 percent of the range's positive full-scale
value, then at 0 A, then at 95 percent of the range's negative full scale value, and then again at
0 A. For example, for the 1 mA range, complete the procedure four times using each of the
following values, in this order: +0.95 mA, 0 A, –0.95 mA, 0 A.
Current calibration verification procedure for the 1 µA to 1 A ranges
Step
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
* The measure range is coupled to the source range when simultaneously sourcing and measuring current,
so you do not need to set the measure range.
** Where <Range> = 1e-6, 10e-6, 100e-6, 1e-3, 10e-3, 100e-3, and 1.
*** The source limits are calculated based on the programmed source value of the Model 2461 for each range
(not the actual value).
**** The measure limits are calculated based on a precise measurement of the programmed value of the
Model 2461 (not the programmed value).
Current calibration verification for the 4 A to 10 A ranges
Follow the steps below to verify that Model 2461 current source-measure accuracy is within specified
limits. In this test, you set the output current to each full-range value and measure the voltage drop
across a shunt resistor with a precision digital multimeter (DMM) and then calculate the current.
2461-905-01 Rev. A / February 2016
Command or procedure
*RST
:SOUR:FUNC CURR
:FUNC "CURR"
:SOUR:CURR:RANG <Range>
:SYST:RSEN OFF
:ROUT:TERM <FRONT or REAR>
:SOUR:CURR <Level>
:OUTP:STAT ON
Make DMM reading.
:READ?
:DIG:FUNC "CURR"
:DIG:CURR:APER AUTO
:DIG:CURR:SRAT 1000
:DIG:COUNT 1
:READ:DIG?
:OUTP:STAT OFF
Calculate the source error.
Calculate the measure error.
Calculate the digitizer error.
Validate source accuracy.***
Validate measure accuracy.****
Validate digitizer accuracy ****
Description
Restore default settings.
Select the source function.
Select the measure function.*
Set the source range.**
Disable 4-wire remote sensing.
Select the front-panel or rear-panel terminals to
match your test setup.
Program the source value.
Turn on the source output.
Read the actual output of the Model 2461 using
the external DMM.
Have the Model 2461 measure and return its
source output.
Select digitize current function.*
Set aperture to match sample rate.
Set 1000 readings/s (1 mS aperture).
Digitize one sample when triggered.
Return the digitized reading of the source output.
Turn off the source output.
Calculate the difference between step 7 and
step 9.
Calculate the difference between step 9 and
step 10.
Calculate the difference between step 9 and
Step 15.
Compare the result of step 17 to the source
specification.
Compare the result of step 18 to the measure
specification.
Compare the result of step 19 to the digitizer
specification.
Section 3: Calibration
3-7