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Precautions for DC measurement
Thermoelectric EMF error
Thermoelectric voltage is the most common error source in low level DC voltage
measurement. Thermal voltages are generated by connecting circuits using
heterogeneous metals at different temperatures. Each connection between the metals will
form a thermocouple which will generate a voltage proportional to the connection
temperature as shown in the table below. You should minimize thermocouple voltage and
temperature variations during low level voltage measurements. The best connection can
be made by pressing the copper wire to the copper wire.
Load error (DC voltage)
Measurement load errors occur when the resistance of the device-under-test (DUT) is a
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