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Appendix 3 Measurement values when using four-terminal measurement (Differences in mea-
A
5
Appendi
x
Depending on the subject of measurement, such as a lead-acid battery, mea-
surement values may vary due to the measurement lead used. Since these dif-
ferences in measurement values are due to the shapes and dimensions of the
probes used in four-terminal measurement, measurement values taken using
any probe represent the true values for that probe only.
When judging battery wear using changes in resistance values with time, be
sure to use measurement leads having the same dimensions.
Explanation
Differences in measurement values are physical phenomena resulting from dif-
ferences in the distances (dimensions) between current-impression pins and
voltage-measurement pins. The greater the battery terminal resistance in com-
parison to the battery's internal resistance, the more marked these differences
become.
The following diagram shows how differences in voltage detected result from dif-
ferences in distance when measuring a lead-acid battery.
Appendix 3 Measurement values when using
four-terminal measurement
(Differences in measurement values
due to measurement leads used)
A
B
+Terminal
+Terminal
-Terminal
-Terminal
Lead-acid battery
Lead-acid battery
Equipotential line
Equipotential line
Potential gradient
Potential gradient
V (voltage detected):A
>
B
Parallel pins
Example: The model L2100/L2110
Pin distance
:
2.5
mm
Coaxial pins
(Example: The model 9770)
Pin distance
:
0.6
mm
HIOKI BT3564A961-02
Содержание BT3564
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Страница 44: ...3 7 Displaying Measurement Results 38 HIOKI BT3564A961 02...
Страница 80: ...4 12 Reset Function 74 HIOKI BT3564A961 02...
Страница 89: ...5 4 Internal Circuitry 83 5 Chapter 5 External Control EXT I O 5 4 Internal Circuitry HIOKI BT3564A961 02...
Страница 98: ...6 3 Printing 92 HIOKI BT3564A961 02...
Страница 170: ...8 8 Sample Programs 164 HIOKI BT3564A961 02...
Страница 182: ...10 3 Error Indication 176 HIOKI BT3564A961 02...
Страница 202: ...Appendix 11 Dimensional Diagram A20 HIOKI BT3564A961 02...
Страница 206: ...Index 4 HIOKI BT3564A961 02...
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