Manual Voltcraft VC-450 E (page 50 of 136) (English, German, Dutch, French)

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Proceed as described above to measure alternating currents (A ).

- TurntheDMMonandselectthedesiredmeasuringfunction“A,mA,µA”.

- Press“SELECT”toswitchtotheACmeasuringrange.“AC”appearsinthe

display. Pressing this button again takes you back to the DC measurement

range, etc.

- Connectthemeterasdescribedinchapter“Measuringdirectcurrents”.

- Power the circuit down again after the end of measuring and remove the

measuring lines from the measured object. Switch off the DMM.

g) Resistance Measuring

Make sure that all circuit parts, circuits and components and other objects of measurement are

disconnected from the voltage and discharged.

Proceed as follows to measure resistance:

- TurntheDMMonandselectthemeasuringfunction“Ω”.

- PlugtheredmeasuringlineintotheΩmeasuringjack(E)

and the black measuring line into the COM measuring jack

(D).

- Check the measuring lines for continuity by connecting

the two measuring prods. The impedance value must be

approximately0-0.5Ω(inherentimpedanceofthemeas-

uring lines).

- Forlow-impedancemeasurements,pushthebutton“REL”

(G) to not include the inherent impedance of the measur-

ing lines in the following impedance measurement. The

displayshows0Ω.

- Now connect the two measuring prods to the object to be

measured. As long as the object to be measured is not

high-impedance or interrupted, the measured value will be

indicated on the display. Wait until the displayed value has

stabilised.Withimpedancesof>1MΩ,thismaytakeafew

seconds.

- If “OL” (overload) appears on the display, you have ex-

ceeded the measuring range or the measuring circuit is

interrupted.

- Remove the measuring lines from the object to be meas-

ured after completion of the measurement and switch off

the DMM.

If you carry out a resistance measurement, make sure that the measuring points you touch with the meas-

uring prods are free from dirt, oil, solderable lacquer or similar. Such circumstances can falsify the meas-

ured result.

 Thebutton“REL”worksonlywhenameasuredvalueisdisplayed.When“OL”isdisplayed,thisfunction

cannot be activated.

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Voltcraft VC-450 E Manual

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