236
Affects on Measurements According to the Length of the Test Lead
15.9
Affects on Measurements According to the
Length of the Test Lead
Even if measuring the same workpiece, the length of the test lead changes the waveform.
Following are waveforms with test lead lengths of 1.5 m, 3.0 m, and 5.0 m.
1.5 m
3.0 m
5.0 m
Using a longer test lead increases the cable capacity (C).
According to
T
=2
π
√
LC, the longer the lead, the longer the oscillation period.
Because the cable’s parasitic inductance and parasitic capacitance increase with the length of the
test leads, the rising portion of the waveform is more likely to exhibit ringing.
Following are impulse response waveforms for the same workpiece (a coil of xx mH), measured
using 1.5 m test leads and 5.0 m test leads.
Voltage calibration is performed using the maximum voltage, including ringing. When extending the
standard 1.5 m test leads, arrange equipment so that the cables are as short as possible.
1.5 m cable
5.0 m cable
Содержание ST4030
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Страница 14: ...6 Usage Notes ...
Страница 32: ...24 Inspecting before Measurement and Verifying Operations ...
Страница 42: ...34 Table Copying ...
Страница 108: ...100 Setting Dielectric Break down Judgment Conditions ...
Страница 132: ...124 Terminal Open Error Setting ...
Страница 198: ...190 Editing Files and Folders ...
Страница 214: ...206 Interface Specifications ...
Страница 237: ...229 Dimensions Diagram 15 4 Dimensions Diagram Unit mm 215 1 348 3 178 0 5 285 6 0 5 200 1 13 40 3 1 15 3 1 15 Appendix ...
Страница 248: ...240 Precautions when Processing Test Leads ...
Страница 252: ...244 Index ...
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