AEMC 5050 - Page 17

Megohmmeter Models 5050/5060 15
Therefore: ifthemeasurementlasts1min.-DAR
 ifthemeasurementlastslongerthantheprogrammedPItime-PI
 if1min.aftertheendofthemeasurement-DD
NOTE: If during DAR or PI measurement (automatic or not), a high external inter-
ference voltage becomes present, or the insulation resistance goes beyond the
device’s measurement range, then the DAR or PI measurements are interrupted
and the screen indicates:
DAR
or
MΩ
PI MΩ
or
DD MΩ
ThedisplayoftheDDvalueis:
• Unknown(----)ifC<1nFandIdd<100pA
• Knownandashingif1nF≤C<10nFand100pA≤Idd<1nA
• KnownandpermanentifC≥10nFandIdd≥1nA
(withC=measuredcapacitanceandIdd=measuredleakagecurrent)
NOTE: The 10 min / 1 min measurement durations for PI calculation can be
modified in the SET-UP menu (see § 2.5.7), allowing changes to standards or
to suit a particular application.
Second Function - R(t)
Usedtoaccesstheintervalinsulationresistancevaluesasafunctionoftimeafter
ameasurementin“time-controlledtest”mode(see§2.5.2).
ThetimebetweeneachsavedsampleisprogrammedintheSET-UPmenu.
ThisfunctionisalsoavailableontheModel5050,whichhasneitheraread-write
memory for saving measured data, nor an interface for data retrieval from the
instrumentbyaPC.
Model 5050:
Upto20samplescanberecordedduringmeasurementatthesampleratechosen
in SET-UP(thedefaultvalueis30seconds).Itispossibletosavemorethan20
samplesdependingonavailablememory.
Model 5060:
Thenumberofsamplesthatcanbesavedisonlylimitedbythememoryspace
available.
Toenterthedisplaymode,presstheR(t)button:
• Thesmalldisplayindicatesthetime00:30(e.g.thesamplingfrequencyis
every30s).
• ThemaindisplayshowsthecorrespondingRvalue.
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