Temperature Effects On Smu Accuracy - Ossila FACT1 User Manual

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Range
±10 V
±100 V

Temperature effects on SMU accuracy

Devices operating outside the five degree range of the last calibration temperature, with the
calibration carried out no later than one year from the time the acquisition is carried out, have an
accuracy that is given by the sum of the "factory standard accuracy" (see above) with an extra term
depending on the Tempco (temperature coefficient), where Tempco is express as % of the factory
accuracy specification per degree
As an example, let us suppose that a PXI calibrated at T = 25
SMU with output voltage V
From the Voltage Output accuracy table and Eq. 32, the uncertainty on the output is given by
Accuracy = 20 x ( 0.025)/100 + 10 mV
= 15 mV.
The correction factor due to the temperature is
Temp_Accuracy = Accuracy x (Tempo)/100 *|Calibration_temp – Meas_Temperature|
= 15 x 0.15 x 10
= 22.5 mV.
The PXI output is then given by V
Ossila Ltd
Voltage Measurement Accuracy and Resolution
Resolution Accuracy ± (%of reading +offset)
10 μV 0.02% + 3.0 mV
100 μV 0.02% + 5.0 mV
o
C. For both NI PXI 4132, and Keithley 2612B Tempco is 0.15.
= 20 V.
out
= 20 V ± 37.5 mV.
out
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o o
C is operated at 35 C. The PXI is use as
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