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LeCroy WaveRunner Xi-A - Probe Compensation

LeCroy WaveRunner Xi-A
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WAVERUNNER Xi-A AND MXi-A SERIES
20 WRXi-A-GSM-E Rev A
LeCroyī˜ƒalsoī˜ƒoffersī˜ƒaī˜ƒvarietyī˜ƒofī˜ƒpassiveī˜ƒandī˜ƒactiveī˜ƒprobesī˜ƒforī˜ƒuseī˜ƒwithī˜ƒyourī˜ƒ
WaveRunnerī˜ƒXiī˜ƒSeriesī˜ƒoscilloscope.ī˜ƒVisitī˜ƒwww.lecroy.com
ī˜ƒforī˜ƒspecificationsī˜ƒandī˜ƒ
orderingī˜ƒinformation.ī˜ƒ
Currentī˜ƒ
Probesī˜ƒ
Currentī˜ƒProbesī˜ƒmeasureī˜ƒtheī˜ƒcurrentī˜ƒpassingī˜ƒthroughī˜ƒaī˜ƒwire.ī˜ƒThey ī˜ƒ
doī˜ƒnotī˜ƒuseī˜ƒtheī˜ƒtraditionalī˜ƒprobingī˜ƒstyleī˜ƒofī˜ƒplacingī˜ƒaī˜ƒtipī˜ƒontoī˜ƒaī˜ƒtestī˜ƒ
point.ī˜ƒInstead,ī˜ƒaī˜ƒwireī˜ƒisī˜ƒplacedī˜ƒinsideī˜ƒofī˜ƒtheī˜ƒjawī˜ƒofī˜ƒtheī˜ƒprobe,ī˜ƒwhichī˜ƒ
thenī˜ƒallowsī˜ƒtheī˜ƒprobeī˜ƒtoī˜ƒmeasureī˜ƒtheī˜ƒcurrentī˜ƒ(inī˜ƒAmps).ī˜ƒ
Activeī˜ƒ
Probesī˜ƒ
Thereī˜ƒareī˜ƒtwoī˜ƒdifferentī˜ƒtypesī˜ƒofī˜ƒactiveī˜ƒprobes:ī˜ƒsingleā€endedī˜ƒandī˜ƒ
differential.ī˜ƒ
Singleā€ended:ī˜ƒAī˜ƒsingleā€endedī˜ƒactiveī˜ƒprobeī˜ƒisī˜ƒassociatedī˜ƒwithī˜ƒ
measuringī˜ƒvoltagesī˜ƒatī˜ƒhighī˜ƒfrequencies.ī˜ƒMeasurementī˜ƒwithī˜ƒanī˜ƒ
activeī˜ƒprobeī˜ƒrequiresī˜ƒaī˜ƒtestī˜ƒpointī˜ƒandī˜ƒaī˜ƒgroundī˜ƒpoint.ī˜ƒTheī˜ƒgroundī˜ƒ
(alsoī˜ƒcalledī˜ƒearth)ī˜ƒactsī˜ƒasī˜ƒaī˜ƒzeroī˜ƒreferenceī˜ƒfo
rī˜ƒtheī˜ƒtestī˜ƒpointī˜ƒ
measurement.ī˜ƒ
Differential:ī˜ƒDifferentialī˜ƒactiveī˜ƒprobesī˜ƒareī˜ƒlikeī˜ƒtwoī˜ƒprobesī˜ƒinī˜ƒone.ī˜ƒ
Insteadī˜ƒofī˜ƒmeasuringī˜ƒaī˜ƒtestī˜ƒpointī˜ƒinī˜ƒrelationī˜ƒtoī˜ƒaī˜ƒgroundī˜ƒpointī˜ƒ(likeī˜ƒ
singleā€endedī˜ƒactiveī˜ƒprobes),ī˜ƒdifferentialī˜ƒprobesī˜ƒmeasureī˜ƒtheī˜ƒ
differenceī˜ƒinī˜ƒvoltageī˜ƒofī˜ƒaī˜ƒtestī˜ƒpointī˜ƒinī˜ƒrelationī˜ƒtoī˜ƒanotherī˜ƒtestī˜ƒpoint.ī˜ƒ
Passiveī˜ƒ
Probesī˜ƒ
Passiveī˜ƒprobesī˜ƒmeasureī˜ƒvoltagesī˜ƒatī˜ƒlowerī˜ƒfrequenciesī˜ƒ(<400ī˜ƒMHz).ī˜ƒ
Theyī˜ƒhaveī˜ƒhigherī˜ƒinputī˜ƒcapacitanceī˜ƒ(inputī˜ƒC)ī˜ƒandī˜ƒdoī˜ƒnotī˜ƒneedī˜ƒ
powerī˜ƒtoī˜ƒoperateī˜ƒ(unlikeī˜ƒactiveī˜ƒprobes).ī˜ƒAtī˜ƒhigherī˜ƒfrequencies,ī˜ƒ
higherī˜ƒinputī˜ƒcapacitanceī˜ƒloadsī˜ƒtheī˜ƒtestī˜ƒcircuit,ī˜ƒattenuatingī˜ƒtheī˜ƒ
signal.ī˜ƒThisī˜ƒisī˜ƒwhyī˜ƒactiveī˜ƒprobesī˜ƒareī˜ƒusedī˜ƒinī˜ƒhighī˜ƒfrequencyī˜ƒ
applications.ī˜ƒP
assiveī˜ƒprobesī˜ƒalsoī˜ƒmeasureī˜ƒvoltageī˜ƒinī˜ƒreferenceī˜ƒtoī˜ƒ
ground.ī˜ƒ
Highī˜ƒ
Voltageī˜ƒ
Probesī˜ƒ
Theseī˜ƒareī˜ƒactiveī˜ƒsingleī˜ƒendedī˜ƒprobesī˜ƒthatī˜ƒareī˜ƒdesignedī˜ƒtoī˜ƒmeasureī˜ƒ
highī˜ƒvoltagesī˜ƒ(safely).ī˜ƒTheyī˜ƒmeasureī˜ƒtheī˜ƒvoltageī˜ƒinī˜ƒreferenceī˜ƒtoī˜ƒ
ground.ī˜ƒ
Probeī˜ƒCompensationī˜ƒ
Passiveī˜ƒprobesī˜ƒmustī˜ƒbeī˜ƒcompensatedī˜ƒtoī˜ƒflattenī˜ƒovershoot.ī˜ƒThisī˜ƒisī˜ƒaccomplishedī˜ƒbyī˜ƒ
meansī˜ƒofī˜ƒaī˜ƒtrimmerī˜ƒatī˜ƒtheī˜ƒconnectorī˜ƒendī˜ƒofī˜ƒtheī˜ƒprobe.ī˜ƒ
1. Attachī˜ƒtheī˜ƒconnectorī˜ƒendī˜ƒofī˜ƒsuppliedī˜ƒpassiveī˜ƒprobeī˜ƒtoī˜ƒanyī˜ƒchannel.ī˜ƒ
2. Connectī˜ƒtheī˜ƒprobeī˜ƒendī˜ƒtoī˜ƒtheī˜ƒCALī˜ƒoutputī˜ƒconnectorī˜ƒatī˜ƒtheī˜ƒfrontī˜ƒofī˜ƒtheī˜ƒ
oscilloscope.ī˜ƒ

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