Service Manuals, User Guides, Schematic Diagrams or docs for : Keithley Appnotes 2566 Drift in Lo Res

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                                         A    G R E AT E R       M E A S U R E       O F   C O N F I D E N C E




Problem: Reading Drift
in Low Resistance
Measurements
Probable Cause:                                                  ity. Apply the test current and measure            the circuit temperature during the meas-
Thermoelectric Voltages                                          the voltage. Then reverse the polarity of          urement cycle will cause changes in the
    Thermoelectric voltages are the most                         the test current and measure the voltage           thermal EMFs that will not be completely
common cause of reading drift in low re-                         again. Add the two voltage measure-                cancelled, and some error will result.
sistance measurements. They are caused by                        ments and divide the result by two. This
differences in temperature between different                     completely cancels the thermal EMF in           B. Offset Compensation Technique--Make
parts of the measurement circuit.                                the measurement.                                   two voltage measurements, one with the
                                                                                                                    test current enabled, the other with the
Remedies                                                         This method requires a low noise voltme-           test current disabled. Subtract the results
A. Current

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