Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent Tips for Making Low Current Measurements with an Oscilloscope and Current Probe 5989-7529EN c20140719 [4]

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Keysight Technologies
Tips for Making Low Current Measurements
with an Oscilloscope and Current Probe


                                                                  Application Note




        In recent years, engineers working on mobile phones
        and other batterypowered devices have demanded
        highersensitivity current measurement to help them
        ensure the current consumption of their devices
        is within acceptable limits. Measuring current is a
        nuisance because you have to break the circuit to put
        the measuring instrument in series with the circuit.
        Using a clampon current probe with an oscilloscope
        is an easy way to make current measurement that
        does not necessitate breaking the circuit. But this
        process gets tricky as the current levels fall into the
        low milliampere range or below.This article offers
        useful tips to help you make accurate lowlevel
        current measurements in the presence of relatively
        high levels of oscilloscope noise.
02 | Keysight | Tips for Making Low Current Measurements with an Oscilloscope and Current Probe  Application Note




      Scope noise matters                                   So, how do you minimize the oscillo
                                                            scope's inherent noise? With modern
                                                                                                                    3) Averaging mode
                                                                                                                    When the signal is periodic or DC, you
      As the current level decreases,                       digital oscilloscopes, there are a num                  can use averaging mode to reduce the
      the oscilloscope's inherent                           ber of possible approaches:                             oscilloscope's vertical noise. Averaging
      noise becomes a real issue. All                                                                               mode takes multiple acquisitions of a
      oscilloscopes exhibit one undesirable                 1) Bandwidth limit filter                               periodic waveform and creates a run
      characteristic 

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