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The DMM

The DMM. ECE 2100. Dr. Len Trombetta. Meter Resistance. All meters add a resistance to the circuit they are connected to. The resistance varies from one meter to the next. For the Agilent 34405A in the lab…. dc voltage measurement: R m,V = 10[M W] on all scales.

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The DMM

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  1. The DMM ECE 2100 Dr. Len Trombetta

  2. Meter Resistance All meters add a resistance to the circuit they are connected to. The resistance varies from one meter to the next. For the Agilent 34405A in the lab… dc voltage measurement: Rm,V = 10[MW]on all scales dc current measurement: Rm,A = 20[W] at 10[mA] = 2[W] at 100[mA] = 0.5[W] at 1[A]

  3. Meter Ranging The secondary display shows the full-scale range. The 34405A is auto-ranging: it will automatically choose the full-scale best suited to the measurement you are making. But… This button (along with the “shift” key) will return the DMM to the auto-ranging mode. Manual ranging: choose your own full-scale range.

  4. RMS Measurements Another way to characterize the amplitude of a periodic waveform is the rms (root-mean-square) amplitude: When set for ac voltage or current measurement, the Fluke automatically provides rms. If v(t) is a sine or cosine (sinusoid), then

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