XITRON XT2640 - Current Measurement Specifications; Current Input Capability and Characteristics

XT2640OperatingManual 13July2016 Page169of187
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TotalScalingerrors=±0.032645%ofreading
FloorErrors:
BaseFloor=450µV
DCFloor=(0V/230V)*1mV=0
ACfloor=(100µV/230V)atMAINS=0.43µV(canbeignored)
Common‐Mode=ifnot3ø3w(2ch)wiring=none
Common‐Mode=if3ø3w(2ch)wiring=1µV*(230V/√3)*50Hz=6.6mVat(30+90)°=±3.3mV
TotalFloorErrors=±0.45mVor±3.75mV=0.0002%or0.0016%ofreading
Example2
ForanAtypechannelthemaximumerrorofameasurementofthefundamentalofa230Vrmsvoltageat50Hzwhen50harmonics
areconfiguredisaworstcaseof±0.035%ofreadingascalculatedby:
ScalingErrors:
BaseScaling=±0.03%
FrequencyDependentScaling=NoneatMAINS
Self‐heatingScaling=±0.05%*(230V/1000)
2
=±0.002645%
TemperatureScaling=nonewithin5Cofthecalibrationtemperature
BandwidthLimitScaling=nonewhenusingAUTO‐TRACK
TotalScalingerrors=±0.032645%ofreading
FloorErrors:
BaseFloor=450µV
ACfloor=(100µV/230V)atMAINS=0.43µV(canbeignored)
Common‐Mode=ifnot3ø3w(2ch)wiring=none
Common‐Mode=if3ø3w(2ch)wiring=1µV*(230V/√3)*50Hz=6.6mVat(30+90)°=±3.3mV
TotalFloorErrors=±0.45mVor±3.75mV=0.0002%or0.0016%ofreading
HarmonicAmplitudeErrors:
(H/N)
2
*0.3%ofreading=(1/50)*0.03%=±0.0006%
Isfundamental,sonofurtherharmonicamplitudeerror
TotalHarmonicAmplitudeErrors=±0.0006%ofreading
Example3
ForanAtypechannelthemaximumerrorofameasurementofa10%THDofa230Vrmsvoltageat50Hzwhen50harmonicsare
configuredisaworstcaseof±0.10%ascalculatedby:
(0.005+0.000025*N)*%THD=(0.005+(0.000025*50))*10=0.0625%THD
0.00005*N*√N=0.00005*50*√50=0.0177%THD
0.015+1/V
AC
=0.015+1/230=0.0193%THD
Example4
ForanAtypechannelthemaximumerroroftheinter‐channelvoltagefundamentalphaseat50Hzisaworstcaseof
0.02°+0.15°*0.05=±0.021°
Example5
ForanAtypechannelthemaximumerrorofthecrestfactorofa230V/50Hzvoltageisaworstcaseof50mV/230V=0to+0.00022
(i.e.biasedtoahigherreading)
28.3 CURRENTMEASUREMENTSPECIFICATIONS
28.3.1 CURRENT INPUTCAPABILITYANDCHARACTERISTICS
Specification
Channel
Type
OptionH
OptionDHIRange
orAuto‐Rangewhen
onHIRange
OptionDLORange
orAuto‐Rangewhen
onLORange
OptionXHIRange OptionXLORange
NoDamage
CurrentRange
<8ms All
<200A
RMS
and
<300A
PK

<150A
RMS
and
<250A
PK

<60A
RMS
and<150A
PK
<200
V
RMS
and
<300V
PK

<20V
RMS
and<30V
PK

<40ms All <75A
RMS
 <50A
RMS
 <40A
RMS
 <50V
RMS
 <10V
RMS

<1s All <50A
RMS
<30A
RMS
<5A
RMS
<30V
RMS
<5
V
RMS
Continuous All <30A
RMS
 <20A
RMS
<2A
RMS
 <25V
RMS
andV
PK
 <5V
RMS
andV
PK

XT2640Unpowered All AsAbove <2A
RMS
and<150A
PK
<25
V
RMS
and<300V
PK
MeasurableCurrentRange All <225A
RMS
andA
PK
<150A
RMS
andA
PK
 <1.02A
RMS
andA
PK
<23.1V
RMS
andV
PK
 <0.576V
RMS
andV
PK

SpecifiedCurrentRangeAll<30A
RMS
and<200A
PK
<20A
RMS
and<140A
PK
<1A
RMS
andA
PK
<15V
RMS
and<20V
PK
<0.55V
RMS
andV
PK
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Im
p
edanceBurden All 2.5mΩto7mΩ 4mΩ to12mΩ 0.562Ω ±0.75% 20.5
k
Ω±0.25% 10.25kΩ±0.25%
3dBBandwidth(typical)
S,AorL 1.25MHz
W
 5MHz 3MHz
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