AEMC DTR 8510 - 5.2.2.2 Auto Mode; Vt;Pt Excitation Current

32 Digital Transformer Ratiometer DTR
®
Model 8510
2. SelecttheOBJ andTestlocationusing the▼or▲ keyandpress
ENTER.
3. PressENTER or TESTtostoretheMeasurementRecord.
NOTE:
• Afterthetestisrun,thenewlocationisautomaticallyincreased
sequentiallyfromthelaststoredlocation.
• Ifagivenlocationisnotavailableforstorage,theSaveeldwill
displayN/A.
• InordertoNOTSTOREtheMeasurementRecord,simplypress
theTESTbuttonafterthemeasurementiscompleted.
5.2.2.2 Auto Mode
WhenAutomodeisselected,theinstrumentrequiresnouserinput.
1. Attheendofthetest,theMeasurementRecordisstoredintheloca-
tionnexttotherstavailablelocationandthenwillstoresequentially.
NOTE: If the previously stored Measurement Record is encountered, the
Auto store mode will skip over and store the new Measurement Record
in the next available location.
5.2.3 VT/PT Excitation Current
Excitation current, displayed in milli-amperes (mA) is the RMS current
in the Primary (H) winding due to test excitation. The loading on the
Secondary(X)windingduetotheDTR
®
8510isnegligible.
• TheDTR
®
8510usesamaximumof32Vrmsexcitationvoltage
fortesting.Thedisplayedexcitationcurrentwillalmostalways
beasmallfractionoftransformerno-loadexcitationatfull(rated)
voltage.Mosttransformerswillrequirelessthan100mA.
• Ifyouarepresentlyusingaratiometerthatemployssecondary
(X)sideexcitation(e.g.commonhand-crankedinstruments)in
step-upmode,thecurrentmaybemuchhigherthanwhatthe
DTR
®
8510displays.
• Thisisnormalandresultsdirectlyfromthefactthatinmost
step-downtransformers,thePrimary(H)sidehasamuchhigher
impedancethanitsassociatedSecondary(X)winding.
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