XITRON XT2640 - Frequency Measurement Specifications

XT2640OperatingManual 13July2016 Page179of187
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TotalPhaseErrors=±0.006108
28.6 FREQUENCYMEASUREMENTSPECIFICATIONS
FrequencyRange FUNDsettingofMAINS:45Hzto65Hz
FUNDsettingofAVIONICS:300Hzto900Hz
Otherwise‐
LF/PERIODsettingofVLF:0.0099Hzto65Hz
LF/PERIODsettingofLF:0.19Hzto1kHz
LF/PERIODsettingof300msperiod:9Hzto305kHz(Wchanneltype)or80kHz(otherchanneltypes)
LF/PERIODsettingof100msperiod:19Hzto305kHz(Wchanneltype)or80kHz(otherchanneltypes)
LF/PERIODsettingof20msperiod:44Hzto305kHz(Wchanneltype)or80kHz(otherchanneltypes)
LF/PERIODsettingof10msperiod:145Hzto305kHz(Wchanneltype)or80kHz(otherchanneltypes)
LF/PERIODsettingof2msperiod:495Hzto305kHz(Wchanneltype)or80kHz(otherchanneltypes)
IfBANDWIDTHsettoUSERsettingthenupperlimitis0.5*setting
DCLevel DCoffsetisautomaticallyeliminated
Min.Input(typical) Voltage:0.5Vrms(W,SorAchanneltype)or75mVrms(Lchanneltype)atfundamental
Current,Hoption:0.05Armsatfundamental
Current,Doption:0.04Arms(HIrange)or0.3mArms(LOrange)atfundamental
Current,Xoption:5mVrms(HIrange)or150µVrms(LOrange)atfundamental
Min.PulseWidth(typical) Greaterof‐
1.25µs(Wchanneltype)or5µs(otherchanneltypes)
0.001%ofmeasurementperiod
10%ofsignalperiod
UpdatePeriod(nominal) AsshownbelowforFREQSPEEDsettingsofFAST/NORMAL/SLOWrespectively‐
LF/PERIODsettingofVLF:greaterof1/2/15sor1cycle
LF/PERIODsettingofLF:greaterof1/1/5sor1cycle
LF/PERIODsettingof300msperiod:0.25s/0.75s/2s
LF/PERIODsettingof100msperiod:55ms/250ms/1s
LF/PERIODsettingof20msperiod:25ms/200ms/700ms
LF/PERIODsettingof10msperiod:10ms/100ms/300ms
LF/PERIODsettingof2msperiod:2ms/50ms/150ms
Resolution(nominal) WChannelType:0.000125%/UpdatePeriodinseconds
Otherwise:0.0005%/UpdatePeriodinseconds
MaximumError 0.01%+Resolution
SettlingTime(nominal) Greaterof(x2ifsignificantDCcontent)‐
a)2amplitudeperiods
b)2frequencymeasurementperiods
c)4cyclesofthesignal
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