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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
Содержание RM3542
Страница 2: ......
Страница 6: ...Contents iv ...
Страница 16: ...Operating Precautions 10 ...
Страница 26: ...1 3 Screen Organization 20 ...
Страница 32: ...2 3 Turning the Power On and Off 26 ...
Страница 46: ...3 8 Confirming Faulty Measurements 40 ...
Страница 64: ...4 12 Compensating for Thermal EMF Offset Offset Voltage Compensation OVC 58 ...
Страница 84: ...6 4 Auto Exporting Measured Values at End of Measurement Data Output Function 78 ...
Страница 90: ...7 3 Printing 84 ...
Страница 172: ...9 10 Device Compliance Statement 166 ...
Страница 190: ...11 4 Disposing of the Instrument 184 ...
Страница 200: ...Appendix 5 Dimensional Diagram A10 Appendix 5 Dimensional Diagram ...
Страница 214: ...Index Index 4 ...
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