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Keysight Technologies
Viewing Graphical Results
on a DMM Display




        Application Note
Introduction

     Digital multimeters measure and display various parameters such as voltage, current, resistance, and
     temperature in an easy-to-read number format. However, many times you are looking for more than a
     single reading in the display. Often, the really meaningful information lies in the trend or statistics of a
     series of readings. If your DMM offers connectivity, such as LAN or USB ports, you can transfer your
     readings to a computer for computation and display. But transferring data to a PC may take more
     time than you want to spend.

     Now, a new DMM, the Keysight Technologies, Inc. 34461A, offers a way to get insight into your
     measurement data without transferring your data to a PC. The 34461A features a large graphical
     display and built-in math functions that show measurement trends, statistics, and histograms all
     in a single, compact unit.




     Snapshot
     A company designing a high-power solar charger for smart
     phones and tablets needed to rigorously test the circuit that
     detected low solar-cell power for shutting down and restarting
     the charging circuit smoothly. This circuit was necessary
     because the charger had no internal battery to act as a buffer.
     To simulate changing solar radiation, the design team used a
     triangle waveform from an arb/function generator as a source.

     The engineers set up the Keysight 34461A to measure the on/off
     output voltage of the detector circuit and displayed the results
     using the histogram mode. At frequencies below one Hertz,
     the display clearly showed a binary distribution, which was the
     desired result.

     However, they found that for higher frequencies, which occurred
     when they waved a hand across the solar panel, the circuit
     exhibited an anomaly that caused an intermediate output value.
     This anomaly clearly interfered with the proper output charging
     operation. A relatively simple design change to the cutoff
     frequency in the detector circuit solved the problem and
     eliminated potential customer warranty claims.
03 | Keysight | Viewing Graphical Results on a DMM Display 

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