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.
Summary of Contents for 6430
Page 26: ......
Page 32: ......
Page 78: ...2 14 Connections ...
Page 98: ...3 20 Basic Source Measure Operation ...
Page 138: ...5 30 Source Measure Concepts ...
Page 156: ...6 18 Range Digits Speed and Filters ...
Page 168: ...7 12 Relative and Math ...
Page 176: ...8 8 Data Store ...
Page 202: ...9 26 Sweep Operation ...
Page 248: ...11 22 Limit Testing ...
Page 310: ...16 6 SCPI Signal Oriented Measurement Commands ...
Page 418: ...17 108 SCPI Command Reference ...
Page 450: ...18 32 Performance Verification ...
Page 477: ...A Specifications ...
Page 489: ...B StatusandErrorMessages ...
Page 498: ...B 10 Status and Error Messages ...
Page 499: ...C DataFlow ...
Page 503: ...D IEEE 488BusOverview ...
Page 518: ...D 16 IEEE 488 Bus Overview ...
Page 519: ...E IEEE 488andSCPI ConformanceInformation ...
Page 523: ...F MeasurementConsiderations ...
Page 539: ...G GPIB488 1Protocol ...
Page 557: ......