• mar. 03 janvier 2017

    HP3562A Dynamic Signal Analyzer

    One of my old test gears waiting for my attention in the cellar was a HP 3562A Dynamic Signal Analyzer. Back then I bought this device mainly for doing audio analysis (I was building my HiFi system, mostly based on Nelson Pass' schematics), mainly to display spectrum responses and compute …

    • mar. 03 janvier 2017

      HP3562A Dynamic Signal Analyzer - Part 2

      This is the part 2 of the series about my HP 3562A Digital Signal Analyzer, quickly describing the Digital Section of the instrument.

      Digital Section

      The unit is quite capable, since the main CPU is a 68000 (not exactly of small CPU for the time).

      The 8 boards are:

      • A1 …

      • mar. 03 janvier 2017

        HP3562A Dynamic Signal Analyzer - Part 3

        This is the part 3 of the series about my HP 3562A Digital Signal Analyzer, quickly describing the Analog Section of the instrument.

        Analog Section

        The analog section consist in 6 boards:

        • A30: Analog Source
        • A31: Trigger
        • A32, A34: Input ADCs
        • A33, A35: Input

        Analog Source

        This board is mainly …

        • mar. 03 janvier 2017

          HP3562A Dynamic Signal Analyzer - Part 4

          This is the part 4 of the series about my HP 3562A Digital Signal Analyzer, quickly describing the HP 1345A Digital Display unit as well as the repair I had to do on it.

          Display

          The display unit is a HP1345A Digital Display without the option 714 (wich adds a …

          • mar. 22 novembre 2016

            HP 3456A Digital Voltmeter

            A very long time ago, I bought a venerable HP 3456A Digital Voltmeter. Back then, I had no clear idea what kind of device it is; but it was cheap. It worked quite fine (it is indeed not calibrated), but I noticed for a while that it was quite unstable …

            • dim. 18 septembre 2016

              HP 34970A Data Acquisition Unit - communication protocol

              In order to build a replacement display for the HP34970A data acquisition unit, I needed to understand the communication protocol between the CPU board and the front panel assembly.

              General description

              The unit is built with four boards:

              • A1 is the main bard, with the PSU, the main controller and …

              • sam. 17 septembre 2016

                HP 34970A Data Acquisition Unit - part 4

                After a summer pause, I'm back on my HP34970A replair project. In the previous post in this series, I've started to reverse ingineer the serial protocol between the CPU board and the fonrt panel, and implement a prototype of replacement display.

                OLED display

                I bought the bigest OLED display I …

                • dim. 26 juin 2016

                  HP 34970A Data Acquisition Unit - part 3

                  As explained in the previous post in this series, I've started to sniff the serial protocol between the main board and the display panel so I can replace the failed VFD by an OLED or TFT display managed by an arduino or similar.

                  Protocol

                  The serial communication takes place at …

                  • mer. 22 juin 2016

                    HP 34970A Data Acquisition Unit - part 2

                    This is quick follow up of my previous blog post on my attempt to fix my recently acquired HP 34970A.

                    In my hurry to replace the failing FRAM (FM24C04) chips, I also replaced the FRAM chip on one of my 2 plugin modules.

                    Bad idea: the module then provoques an …

                    • lun. 13 juin 2016

                      HP 34970A Data Acquisition Unit

                      I recently "scored" a HP 34970A with the DMM included and 2 plugin cards (HP 34901A and HP 34907A) for less than 200€. The plugins should be in working condition, but the main switch unit was almost "given" with the plugin modules since it is non functional.

                      front view of the HP 34970A data acquisition unit

                      It's in very …

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