Extech Instruments MA140 User Manual

MA140‐en‐GB_V1.01/15
7
InrushCurrentMode
IntheInrushmodethemeterwaitsuntilatleast5Aisdetectedandthenstartsa100mssample 
windowinwhichtocaptureaninrushcurrentRMSvalue.Refertoillustrationbelow.
1. PressandholdtheINRUSHbuttonfor>2secondstoaccesstheInrushCurrentmode.
2.
ThedisplaywillshowtheINRUSHicon.
3. Whenready,takeacurrentmeasurement.Themeterwillcapturethehighestreading
detectedduringa100mswindow.Notethatthe100mswindowdoesnotopenuntilatleast
5Aisdetected.
4. ToexittheInrushCurrentmodepresstheINRUSH
buttonagainmomentarily.TheINRUSH
iconwillswitchOFF.

100ms Sample Window
Measured Inrush
Sample time
trigger
Inrush
Button
Press
Current
Start Stop
T
hreshold

LowPassFilter
TheLowPassFiltermodeoffershighfrequencyrejectionwhenmeasuringVariableSpeedDrives.
TheLowPassFiltermodeoffersacut‐offfrequencyof160Hz(approx.)withanattenuation
characteristicof‐24dbperoctave(approx.).
1. MomentarilypresstheLPFbuttontoaccesstheLPFmode
2. TheLPFdisplay
iconisshownonthedisplayintheLPFmode
3. PresstheLPFbuttonagaintoexittheLPFmode,theLPFiconwillswitchOFF

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Extech Instruments MA140 Specifications

General

Brand	Extech Instruments
Model	MA140
Category	Measuring Instruments
Language	English