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MA44x‐en‐GB_V1.08/16

ControlButtons

 Modebutton:Shortpressestostepthroughthemodeoptionsfortheselected

measurementfunction

 HOLDandBacklightbutton(MA443/MA445):Shortpresstofreeze/unfreezereading.

LongpresstoturnbacklightONorOFF.Notethatthebacklightbuttonisintheupper

rightsideofthemeterfortheMA440(seeSideButtondescriptionbelow)

 HOLDbutton(MA440):Shortpresstofreeze/unfreezereading

 (MA443/MA445only)Shortpresstoenterthemaximummeasurementmode(LCD

displays‘MAX’);pressagaintoentertheminimummeasurementmode(‘MIN’is

displayed).Longpresstoexitthismode.MAX/MINisavailableontheAC

Voltage/Current,Resistance,andTemperatureMA445functionsonly

 (MA445)Shortpresstostorethedisplayedreadingasareferencevalue.Subsequent

measurementswillbedisplayedas‘measurementminusreferencevalue’.This

featureappliestoAC/DCvoltage,ACcurrent,resistance,andtemperaturemodes

only.Shortpresstoexit.ForDCcurrentmeasurementmode,shortpresstozerothe

display;theLCDwillshowthedeltasymbol.Shortpresstoexitthismode.

 (MA440/MA443)Shortpresstostorethedisplayedreadingasareferencevalue.

Subsequentmeasurementswillbedisplayedas‘measurementminusreference

value’.ThisfeatureappliestoAC/DCvoltage,ACcurrent,resistance,andtemperature

modesonly.Shortpresstoexit.

 (MA440only)Shortpresstotogglefrequency(Hz)anddutycycle(%)measurements

fortheVoltageandHzswitchpositions.TheMA443andMA445haveadutycycle

modeaccessibleusingtheMODEbuttonwhenthefunctiondialissettoHz%.

SIDEBUTTON ThebuttonlocatedontheupperrightsideofthemeteriseitherfortheLCD

backlight(MA440:shortpressON/OFF)orworklight(MA443/MA445:Long

pressONandshortpressOFF).

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Extech Instruments MA445 User Manual

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