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XITRON XT2640 - Watts, VAR and VA Measurement Specifications

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XT2640OperatingManual 13July2016 Page176of187
28.4.1 WATTS,VARANDVA MEASUREMENTSPECIFICATIONS
28.4.1.1 PRIMARYWATTS,VARAN DVAMEASUREMENTACCURACYTABLE
AddrelevanterrorsfromthetablebelowforthemaximumerrorinallWatts,VAandVARmeasurementsexceptharmonicWatts.
NotethatbydefinitionDCWattsandDCVAareidentical,andDCVARiszero.
MAXIMUMSCALINGERRORS
Applytoallresultsasshownbelowasapercentageofthereading
Ifsignalcontainssignificantlevelsatmultiplefrequencies,applytoeachlevel&frequency
Specification
Channel
Type
OptionH OptionDHIRange OptionDLORange OptionXHIRange OptionXLORange
BaseScalingError
Applytoallresults
AorL 0.045%
SorW 0.15%(0.3%if2msLF/PERIOD)
FrequencyDependent
ScalingError
ApplytoACcomponentof
allresultsotherthanDCor
MAINS
LForVLF
S,AorL 0.01%
W
0.05%
AVIONICS
AorL 0.005%
Sor
W
None
<10kHz
S,AorL F*0.006%
W
F*0.0025%
10k‐40kHz
S,AorL 0.06%+(F‐10)*0.014%
W
F*0.0025%
40k‐100kHz
S,AorL 0.48%+
(
F‐40
)
*0.032%
W 0.1%+(F‐40)*0.005% 0.1%+(F‐40)*0.0055%
100k‐1MHz
S,AorL T
yp
icall
y
(
F
/
1100
)
2
*150%
W 0.4%+(F‐100)*0.018% 0.43%+(F‐100)*0.02%
>1MHz W Typically(F/5000)
2
*150% Typically(F/3000)
2
*150%
Self‐HeatingScalingError
Applyas%ofPowerreadingtoall
resultsusingvoltageandcurrentSelf‐
HeatingErrorsfromprevioustables
All AddVoltageandCurrentSelf‐HeatingErrors
TemperatureScalin
g
Error
Applytoallresultsifoutsideof±5Cfrom
calibrationtemperature
All 0.005%perCoutsideof±5Cfromcalibrationtemperature
BandwidthLimitScalin
g
Error
ApplytoACcomponentofallresultsif
usingUSERbandwidthsetting
All 20%*(F/F
BW
)
2
,unspecifiedabove0.3*F
BW
MAXIMUMFLOORERRORS
ApplytoallresultsasshownbelowinWatts,VAorVARasapplicable(generallyonlysignificantatlowinputlevels)
Specification
Channel
Type
OptionH OptionDHIRange OptionDLORange OptionXHIRange OptionXLORange
BaseFloorError
Applytoallresults
L
(V
AC+DC
*56µA)+
(A
AC+DC
*45µV)
(V
AC+DC
*38µA) +
(A
AC+DC
*45µV)
(V
AC+DC
*250nA)+
(A
AC+DC
*45µV)
(V
AC+DC
*6µA)+
(A
AC+DC
*45µV)
(V
AC+DC
*0.15µA)+
(A
AC+DC
*45µV)
A
(V
AC+DC
*56µA)+
(A
AC+DC
*450µV)
(V
AC+DC
*38µA)+
(A
AC+DC
*450µV)
(V
AC+DC
*250nA)+
(A
AC+DC
*450µV)
(V
AC+DC
*6µA)+
(A
AC+DC
*450µV)
(V
AC+DC
*0.15µA)+
(A
AC+DC
*450µV)
SorW
(V
AC+DC
*225µA)+
(A
AC+DC
*1.8mV)
(V
AC+DC
*150µA)+
(A
AC+DC
*1.8mV)
(V
AC+DC
*1µA)+
(A
AC+DC
*1.8mV)
(V
AC+DC
*23µA)+
(A
AC+DC
*1.8mV)
(V
AC+DC
*0.6µA)+
(A
AC+DC
*1.8mV)
DCFloorError
ApplytoDCandAC+DCresultsusingthe
VoltageandCurrentDCFloorErrors
fromprevioustables
All (V
DC
*CurrentDCFloorError)+(A
DC
*VoltageDCFloorError)+(CurrentDCFloorError*VoltageDCFloorError)
A
CFloorError(VAandVARonly)
ApplytoACandAC+DCVA&VARresults
usingvoltageandcurrentACFloor
Errorsfrom
p
revioustables
All (V
AC
*CurrentACFloorError)+(A
AC
*VoltageACFloorError)
CommonModeError(VAandVAR
only)
ApplytoACcomponentofVAandVAR
resultsusingtheVoltageandCurrent
CommonModeErrorsfromprevious
tables.
All (V
AC
*CurrentCommonModeError)+(A
AC
*VoltageCommonModeError)
CommonModeError(Wattsonly)
ApplytoACcomponentofWattsresults
usingtheVoltageCommonModeError
fromprevioustable
All (A
AC
*VoltageCommonModeError)
A
djacentChannelError
ApplytoACcomponentofallresults
usingtheVoltageandCurrentAdjacent
ChannelErrorsfromprevioustables
All (V
AC
*CurrentAdjacentChannelError)+(A
AC
*VoltageAdjacentChannelError)
PhaseFloorError(Wattsonly)
ApplytoACandAC+DCWattsresults
S,AorL
VA
FUND
*(PF
FUND
‐cos(cos
‐1
(PF
FUND
)+0.015°*F))
Alternatel
y
,asaworstcase
(
atPF=0
)
thiscanex
p
ressedasF*0.028%ofVA
W
VA
FUND
*(PF
FUND
‐ cos(cos
‐1
(PF
FUND
)+0.007°*F))
Alternately,asaworstcase(atPF=0)thiscanexpressedasF*0.013%ofVA
PhaseFloorError(VARonly)
ApplytoallVARresults
S,AorL
VA
FUND
*(1‐PF
FUND
‐cos(cos
‐1
(1‐PF
FUND
)+0.015°*F))
Alternatel
y
,asaworstcase
(
atPF=1
)
thiscanex
p
ressedasF*0.028%ofVA
W
VA
FUND
*(1‐ PF
FUND
‐cos(cos
‐1
(1‐PF
FUND
)+0.007°*F))
Alternately,asaworstcase(atPF=1)thiscanexpressedasF*0.013%ofVA


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