XITRON XT2640 - Page 173

XT2640OperatingManual 13July2016 Page173of187
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28.3.2.2 SECONDARYCURRENTMEASUREMEN TACCURACYTABLE
Specification
Channel
Type
OptionH OptionDHIRange OptionDLORange OptionXHIRange OptionXLORange
CrestFactorError All (TotalCurrentFloorErrorfromprecedin
g
tableforPKresults)/A
AC

FormFactorError All (TotalCurrentFloorErrorfromprecedin
g
tableforAC+DCresults)/A
RECTIFIED

Multi‐Channel
Error
Forsimilar
currentleveland
phaseineach
phase.
A
N
(2ø3w) All
RelevantCurrentErrorsfromprecedin
g
table forA
øA

+RelevantCurrentErrorsfromprecedingtableforA
øB

+0.0005%of
(
A
øA
+A
øB
)
*F
A
øC
(3ø3w2ch) All
RelevantCurrentErrorsfromprecedin
g
table forA
øA

+RelevantCurrentErrorsfromprecedingtableforA
øB

+0.0015%of(A
øA
+A
øB
)*F
A
N
(3ø4w) All
RelevantCurrentErrorsfromprecedingtableforA
øA

+RelevantCurrentErrorsfromprecedingtableforA
øB

+RelevantCurrentErrorsfromprecedingtableforA
øC

+0.0015%of(A
øA
+A
øB
+A
øC
)*F
Harmonicor
SpectrumError

All
ACCurrentErrorsfromprecedin
g
table at AandFof theharmonicorspectrumpoin
t

+(H/N)
2
*0.3%ofreading
+(ifnotfundamental)frombelowusingthefrequencyoftheharmonicorspectrumpoint
<10kHz
AorL
0.006% ofA
AC+DC
10
k
‐115kHz 0.05% ofA
AC+DC
<10kHz
S
0.01%ofA
AC+DC

10
k
‐115kHz 0.05% ofA
AC+DC
<10kHz
W
0.015%ofA
AC+DC

10k‐115kHz 0.03%ofA
AC+DC

115
k
‐435kHz 0.08% ofA
AC+DC
Current‐VoltageFundamental
PhaseError
S,AorL 0.005°+0.015°*F
W 0.005°+0.007°*F
Harmonic‐FundamentalPhase
Error(typical,BANDWIDTH
configuredasUNFILTERED)
S,AorL 0.02°+0.1°*F+0.001°*H
W 0.02°+0.03°*F+0.001°*H
%THDError
Errorsshownare
allexpressedin
%THDunits.
All
(0.005+0.000025*N)*%THD+0.00005*N*√N
+frombelowusingthefrequencyofhighestincludedharmonic
<10kHz
AorL
0.015+0.2/A
AC
0.015+0.15/A
AC
0.015+0.001/A
AC
0.015+0.025/A
AC
 0.015+0.0006/A
AC
10k‐115kHz 0.15+2/A
AC
 0.15+1.5/A
AC
 0.15+0.01/A
AC
 0.15+0.25/A
AC
 0.15+0.006/A
AC

<10kHz
S
0.025+0.2
/
A
AC
0.025+0.15
/
A
AC
0.025+0.001
/
A
AC
0.025+0.025
/
A
AC
 0.025+0.0006
/
A
AC
10
k
‐115kHz 0.15+2/A
AC
0.15+1.5/A
AC
0.15+0.01/A
AC
0.15+0.25/A
AC
 0.15+0.006/A
AC
<10kHz
W
0.03+0.25/A
AC
0.03+0.18/A
AC
0.03+0.0012/A
AC
0.03+0.03/A
AC
 0.03+0.001/A
AC
10
k
‐115kHz 0.06+2.5/A
AC
0.06+1.8/A
AC
0.06+0.012/A
AC
0.06+0.3/A
AC
 0.06+0.01/A
AC
115k‐435kHz 0.15+2.5/A
AC
 0.15+1.8/A
AC
 0.15+0.012/A
AC
 0.15+0.3/A
AC
 0.15+0.01/A
AC

28.3.2.3 EXAMPLES
Example1
ForanADchannel(HIrange)themaximumerrorofameasurementoftheAC+DCcurrentofa5Armssignalat50Hzisaworstcase
of±0.037%ofreadingascalculatedby:
ScalingErrors:
BaseScaling=±0.03%
FrequencyDependentScaling=NoneatMAINS
Self‐heatingScaling=±0.0002%*5
2
=±0.005%
TemperatureScaling=nonewithin5Cofthecalibrationtemperature
BandwidthLimitScaling=nonewhenusingAUTO‐TRACK
TotalScalingerrors=±0.035%ofreading
FloorErrors:
AC+DCfloor=±110µA±(1.5µA/5A)atMAINS=±110.3µA
Common‐Mode=assumeconnectedto230Vmains=4.6µAat90°tovoltage(so0to±4.6µAdependingoncurrentphase)
TotalFloorErrors=±0.1149mA=0.0023%ofreading
Example2
ForanADchannel(HIrange)themaximumerrorofameasurementofthefundamentalcurrentofa5Armssignalat50Hzwhen50
harmonicsareconfiguredisaworstcaseof±0.038%ofreadingascalculatedby:
ScalingErrors:
BaseScaling=±0.03%
FrequencyDependentScaling=NoneatMAINS
Self‐heatingScaling=±0.0002%*5
2
=±0.005%
TemperatureScaling=nonewithin5Cofthecalibrationtemperature
BandwidthLimitScaling=nonewhenusingAUTO‐TRACK
TotalScalingerrors=±0.035%ofreading
FloorErrors:
ACfloor=±37µA±(1.5µA/5A)atMAINS=±37.3µA
Common‐Mode=assumeconnectedto230Vmains=4.6µAat90°tovoltage(so0to±4.6µAdependingoncurrentphase)
TotalFloorErrors=±0.1149mA=0.0023%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