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Appendix 3 Unstable Measurement Values
A
7
Appendix
(10) Non-Four-Terminal Measurements
The four-terminal method requires that four probes be connected to the
DUT.
By measuring as shown in Fig.10, the measured resistance includes that
of the contacts between the probes and DUT. Typical contact resistance
is several milliohm with gold plating, and several tens of milliohm with
nickel plating. With measurement values of several k
this would not
seem to be a problem, but if a probe tip is oxidized or dirty, contact resis-
tance on the order of a k
is not unusual.
To maximize the opportunity for proper measurements, emulate the four-
terminal method as close as possible to the contact points of the DUT.
(Fig.11)
Figure. 10 Two-Terminal
Measurement
Figure. 11 Four-Terminal
Measurement
HCUR
HPOT
LPOT
LCUR
HCUR
HPOT
LPOT
LCUR
Summary of Contents for RM3542
Page 2: ......
Page 6: ...Contents iv ...
Page 16: ...Operating Precautions 10 ...
Page 26: ...1 3 Screen Organization 20 ...
Page 32: ...2 3 Turning the Power On and Off 26 ...
Page 46: ...3 8 Confirming Faulty Measurements 40 ...
Page 64: ...4 12 Compensating for Thermal EMF Offset Offset Voltage Compensation OVC 58 ...
Page 84: ...6 4 Auto Exporting Measured Values at End of Measurement Data Output Function 78 ...
Page 90: ...7 3 Printing 84 ...
Page 172: ...9 10 Device Compliance Statement 166 ...
Page 190: ...11 4 Disposing of the Instrument 184 ...
Page 200: ...Appendix 5 Dimensional Diagram A10 Appendix 5 Dimensional Diagram ...
Page 214: ...Index Index 4 ...
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