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                                             Technical                                               Digital Multimeters
                                             Information

                                             Digital multimeters convert analog signals to
                                             digital information. In general, DMMs have a                                                              AC                AC                       Digital
                                             minimum of five typical functions. They are DC                                                        Attenuator         Converter                   Display
                                                                                                                                         AC                                                                   Digital
                                             voltage, AC voltage, DC current, AC current, and                                                                                     AC                          Output
                                             resistance. While specifications vary, most DMMs                                                 DC                                DC                            Ports
                                                                                                                                                       DC                                         A/D
                                             can be described with block diagrams similar to             HI
                                                                                                                                                   Attenuator                                   Converter     (IEEE-488,
                                             Figure 1.                                                                                                                        Ohms                            USB,
                                                                                                              Amps                                                                                            RS-232,
                                                                                                                                        Ohms                                                                  Ethernet)
                                             Analog to Digital Conversion                             INPUT
Technical information: Digital multimeters




                                                                                                                                                                                                                              Technical information: Digital multimeters
                                                                                                                                                     Ohms                                       Precision
                                             The A/D converts the analog input signal to a                      Precision                           Converter                                   Reference
                                                                                                                 Shunts
                                             digital output and is primarily responsible for
                                             key instrument characteristics of reading speed,            LO
                                             linearity, resolution, normal mode rejection,
                                             and precision. The digital output is shown or
                                             obtained in several ways. One way is visually, via
                                             the front panel with a display of digits and other      Figure 1: DMM Block Diagram
                                             information. Another way is electronically, with
                                             results sent via a port (GPIB, RS-232, USB, or
                                             Ethernet) to a computer for further processing.
                                                                                                                                        0.0075
                                                                                                                      

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