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F-16
Measurement Considerations
Electromagnetic Interference (EMI)
The electromagnetic interference characteristics of the Model 6430 comply with the electro-
magnetic compatibility (EMC) requirements of the European Union as denoted by the CE
mark. However, it is still possible for sensitive measurements to be affected by external
sources. In these instances, special precautions may be required in the measurement setup.
Sources of EMI include:
•
Radio and TV broadcast transmitters.
•
Communications transmitters, including cellular phones and handheld radios.
•
Devices incorporating microprocessors and high-speed digital circuits.
•
Impulse sources as in the case of arcing in high-voltage environments.
The effect on instrument performance can be considerable if enough of the unwanted signal
is present. The effects of EMI can be seen as an unusually large offset, or, in the case of
impulse sources, erratic variations in the displayed reading.
The instrument and experiment should be kept as far away as possible from any EMI
sources. Additional shielding of the instrument, experiment and test leads will often reduce
EMI to an acceptable level. In extreme cases, a specially constructed screen room may be
required to suf
fi
ciently attenuate the troublesome signal.
External
fi
ltering of the input signal path may be required. In some cases, a simple one-pole
fi
lter may be suf
fi
cient. In more dif
fi
cult situations, multiple notch or band-stop
fi
lters, tuned to
the offending frequency range, may be required. Connecting multiple capacitors of widely dif-
ferent values in parallel will maintain a low impedance across a wide frequency range. Keep in
mind, however, that such
fi
ltering may have detrimental effects (such as increased response
time) on the measurement.
Содержание 6430
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Страница 78: ...2 14 Connections ...
Страница 98: ...3 20 Basic Source Measure Operation ...
Страница 138: ...5 30 Source Measure Concepts ...
Страница 156: ...6 18 Range Digits Speed and Filters ...
Страница 168: ...7 12 Relative and Math ...
Страница 176: ...8 8 Data Store ...
Страница 202: ...9 26 Sweep Operation ...
Страница 248: ...11 22 Limit Testing ...
Страница 310: ...16 6 SCPI Signal Oriented Measurement Commands ...
Страница 418: ...17 108 SCPI Command Reference ...
Страница 450: ...18 32 Performance Verification ...
Страница 477: ...A Specifications ...
Страница 489: ...B StatusandErrorMessages ...
Страница 498: ...B 10 Status and Error Messages ...
Страница 499: ...C DataFlow ...
Страница 503: ...D IEEE 488BusOverview ...
Страница 518: ...D 16 IEEE 488 Bus Overview ...
Страница 519: ...E IEEE 488andSCPI ConformanceInformation ...
Страница 523: ...F MeasurementConsiderations ...
Страница 539: ...G GPIB488 1Protocol ...
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