AEMC 5050 - 4 Measurement Functions; Ac;DC Voltage; Insulation Measurement

Megohmmeter Models 5050/5060 31
CHAPTER 4
MEASUREMENT FUNCTIONS
4.1 AC/DC Voltage
• Selectanymeasurementpositionwiththerotaryselectorswitch.
• TheinstrumentisautomaticallyinAC/DCvoltagemeasurementmode.
• Thevoltageiscontinuouslymeasuredandisshownonthesmalldisplay.
Measurementisprohibitedifanexternalvoltageispresentattheterminalsbefore
pressing START/STOP. Similarly, if an interference voltage is detected during
measurement,themeasurementisstoppedandthatvoltageisindicated.
4.2 Insulation Measurement
AssoonasoneoftheMΩpositionshasbeenselected,themaindisplayshows
“----MΩ”,andthesmalldisplayindicatesthevoltagepresentatthedevice’s“+”
and“–”terminals.
WARNING: If the external voltage present at the device’s terminals exceeds
the threshold shown below, pressing the yellow START/STOP button does
not bring about insulation measurement, but instead triggers an audible signal.
The symbol flashes for 2 seconds, then the device goes back to automatic
voltage measurement.
Threshold: V peak ≥ dISt x Vn
• Vpeak:ExternalpeakvoltageorDCpresentatunitterminals.
• dISt:Coe󰀩cientdenedintheset-upmenu(adjustableto0.03-0.10-
0.20-defaultvalue:0.03).
• Vn:Testvoltagechosenforinsulationmeasurement.
Iftheexternalvoltagepresentatthedeviceterminalsislessthanthevaluedened
previously,theninsulationmeasurementcanproceed:
PressingSTARTimmediatelybeginsthemeasurement.Themeasurementvalue
isdisplayedonthemaindigitaldisplayandonthebargraph.Anaudiblebeepis
givenoutevery10secondstoindicatethatmeasurementisinprogress.
WARNING: If the test voltage is considered to be dangerous (>120V), the
symbol is displayed. If, during insulation measurement, an external voltage
higher than the value defined by the following threshold is detected, the mea-
surement is stopped as long as the voltage is applied to the instrument.
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