Using the DMM for the First Time



Step One: Switching the DMM On


Step Two: Setting the DMM to Measure V, A or R

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  • Measuring Resistance: Depress the switch labelled Switch2 in the diagram and then connect the COM input to one side of the resistance we wish to measure and the V/~ to the other side.
  • Measuring A.C. Voltage/Current: Depress the switch labelled Switch1 in the diagram and then connect the COM input to the negative side of the circuit branch at which we wish to measure the current/voltage. Then if we are measuring Voltage connect the other node at which we wish to measure the voltage to the Input labelled V/~. If we are measuring Current connect the other node to either the input marked mA or the input marked 10A.
  • Measuring D.C. Voltage/Current: This is done exactly the same way as A.C. except Switch1 is not depressed.

Step Three: Taking the Reading From the Display

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  • When we look at the display we can see a decimal number, for example let's use 7.86.
  • Now this does not tell us a great deal about the actual amplitude of the signal, in order to find which units the reading is in we must observe the setting of the Range Control Switches. (These are the switches on the left circled in red).
  • Now we simply look at which switch is depressed and read the scale on the right hand side of that switch.
    e.g. We are measuring current and get a reading of 7.86, now the third switch from the top is depressed (200mA scale) so the final reading is 7.86mA.
    If the top switch was depressed (10A Scale) the reading would be 7.86 Amps.

Things to Remember:


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Revised:
15 September 2004