Service Manuals, User Guides, Schematic Diagrams or docs for : Agilent journals 1960-07

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                                                               HEWLETT- PACKARD

                                          JOURNAL
                                          T E C H N I C A L   I N F O R M A T I O N   F R O M   T H E   - h p -   L A B O R A T O R I E S
                                                                                                                                                                           Vol. 11, No. 11-12

JBLISHED BY THE HEWLETT-PACKARD COMPANY, 1501 PAGE MILL ROAD, PALO ALTO, CALIFORNIA                                                                                        JULY- AUG., 1960




                            A New Clip-On Oscilloscope/Voltmeter Probe
                              For 25^-20 MC Current Measurements
      TWO years ago -hp- introduced a dc milliammeter                                   can be used equally well with pulse and other com
          that used a clip-on probe to couple to the conduc                             plex waveforms as with sine waves. Further, because
      tor that carried the current to be measured. Because                              it has the outstanding property of reflecting virtually
      it merely clipped around the conductor and thus                                   no loading into the circuit being measured, the probe
      avoided the need for breaking the circuit, this probe                             enables current to be measured with ease in cases that
      changed the measurement of current from an incon                                  previously would have been considered impractically
      venient and sometimes difficult measurement to an                                 difficult. Such cases include measuring the current in
      easy measurement. Later, this dc instrument was fol                               circuits at resonance, in ground buses, in solid-state
      lowed by another clip-on probe type instrument                                    rectifiers at turn-on, etc.
      which measured ac current in combination with the                                    The probe operates with an accompanying small
      -hp- wide-band oscilloscope.                                                      amplifier (Fig. 3) to convert the ac current being
         The popularity of these clip-on probes for current                             measured to a proportional voltage. This voltage can
      measurements has now led to the development of a                                  then be measured with a suitable oscilloscope or volt
      new and even more flexible clip-on probe

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