Extech Instruments MA140

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

www. .com
information@itm.com1.800.561.8187