Extech Instruments MultiMaster MM560A Guide de l'utilisateur télécharger pdf (Page 13)

13 MM560A-MM570A-EU-EN

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

A, mA, A, and %4-20mA Current functions

Insert the red test lead into the correct



A/mA or A input jack. Press SELECT button momentarily to

select DC, AC, or DC+AC. The new settings will be saved automatically to the non-volatile memory as

power up default. In DC mA function, neither in AC nor in DC+AC,

press and hold

the %4-20mA

(

Hz) button for 1 second or more to display the current digital data in terms of loop current

percentage (%) value. It is set at 4mA = 0% (zero) and 20mA = 100% (span) with 0.01% high

resolution, which virtually extends the meters’ capability to test and regulate the externally powered

loop current in the industrial process control applications. The analog bar-graph remains showing the

mA current value to alert the user.

A A A

%4-20mA

Warning: When measuring a 3-phase system, special attention should be taken to the phase-to-phase

voltage that is significantly higher than the phase-to-earth voltage. To avoid exceeding the voltage

rating of the protection fuse(s) accidentally, always consider the phase-to-phase voltage as the

working voltage for the protection fuse(s).

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Extech Instruments MultiMaster MM560A Guide de l'utilisateur Page 13