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| 1 ================================= | |
| 2 HP3562A Dynamic Signal Analyzer | |
| 3 ================================= | |
| 4 | |
| 5 :Author: David Douard | |
| 6 :Category: Electronics | |
| 7 :Tags: HP3562A, repair, test equipment, DSA | |
| 8 :series: HP 3562A | |
| 9 :series_index: 1 | |
| 10 | |
| 11 One of my old test gears waiting for my attention in the cellar was a | |
| 12 HP 3562A Dynamic Signal Analyzer. Back then I bought this device | |
| 13 mainly for doing audio analysis (I was building my HiFi system, mostly | |
| 14 based on Nelson Pass' schematics), mainly to display spectrum | |
| 15 responses and compute THD and so. | |
| 16 | |
| 17 I did not reall know what this test equipment is capable of. But `Dave | |
| 18 Jones's video #528`_ (and several wonderful videos on `w2aew's | |
| 19 channel`_) gave me the desire of playing a bit more with this old but | |
| 20 very impressive HP3562A. | |
| 21 | |
| 22 .. _`Dave Jones's video #528`: https://www.youtube.com/watch?v=Y0jkPLuFdnM&t=1876s | |
| 23 .. _`w2aew's channel`: https://www.youtube.com/user/w2aew | |
| 24 | |
| 25 | |
| 26 Quick tour | |
| 27 ========== | |
| 28 | |
| 29 Here is the beast: | |
| 30 | |
| 31 .. image:: {filename}images/hp3562a/front.jpg | |
| 32 | |
| 33 I said the beast, because despite being an amazing piece of test | |
| 34 equipment, it's also very big (576mm x 426mm x 222mm), very heavy | |
| 35 (26kg) and... unfortunately quite loud. | |
| 36 | |
| 37 My version of the instrument is rather "recent", and manuals available | |
| 38 on Keysight web site concern only the earliest models | |
| 39 (ref. 03563-90210) and are of poor quality, with missing pages etc. So | |
| 40 I bought the correct Service Manual (HP ref. 03562-90213) on ebay from | |
| 41 `Artek Media`_. | |
| 42 | |
| 43 .. _`Artek Media`: http://www.artekmedia.com/ | |
| 44 | |
| 45 Since it was on my "bench", I decided to see a bit inside, using the | |
| 46 occasion to investigate and fix the only real problem I have (as far | |
| 47 as I know) with my device: the dimm display. | |
| 48 | |
| 49 .. image:: {filename}images/hp3562a/front_open.jpg | |
| 50 | |
| 51 The unit consist in mostly 4 parts: | |
| 52 | |
| 53 - a big switching power supply (with huge capacitors) on the left side | |
| 54 of the enclosure, under the display, | |
| 55 | |
| 56 - the display unit: a very nice HP1435A Digital Display; we'll discuss | |
| 57 it a bit more later, | |
| 58 | |
| 59 - the digital section consisting in 8 boards (rear right), | |
| 60 | |
| 61 - the analog section consisting in 6 boards (front right). | |
| 62 | |
| 63 | |
| 64 The general block diagram: | |
| 65 | |
| 66 .. image:: {filename}images/hp3562a/hp3562a_block_diagram_new.png | |
| 67 :alt: General block diagram of the HP3562A | |
| 68 | |
| 69 The instrument is built around 2 buses: | |
| 70 | |
| 71 - the control bus which allows the main CPU to control all the | |
| 72 assemblies, and | |
| 73 | |
| 74 - the global bus which is used to transfer measurement data between | |
| 75 assemblies. | |
| 76 | |
| 77 In the HP3562A, the process control is distributed away from the | |
| 78 system CPU: each assembly has its own processor or state machine which | |
| 79 controls its local operations. The main CPU tells each assembly which | |
| 80 process to execute and monitors the overall functionning and data | |
| 81 processing of the instrument. | |
| 82 | |
| 83 For the record, the block diagram from Service Manual 03562-90219 | |
| 84 looks like: | |
| 85 | |
| 86 .. image:: {filename}images/hp3562a/block_diagram.png | |
| 87 :alt: General block diagram of the HP3562A from earliest Service Manual | |
| 88 | |
| 89 | |
| 90 Power Supply | |
| 91 ============ | |
| 92 | |
| 93 .. image:: {filename}images/hp3562a/hp3562a_a18_psu_block_diagram.png | |
| 94 :alt: Block diagram of the switching power supply unit | |
| 95 | |
| 96 | |
| 97 .. image:: {filename}images/hp3562a/a18_psu.jpg | |
| 98 | |
| 99 The primary capacitors are huge Sprague caps (1400µF 250V): | |
| 100 | |
| 101 .. image:: {filename}images/hp3562a/caps.jpg | |
| 102 | |
| 103 The power line filter is also pretty impressive: | |
| 104 | |
| 105 .. image:: {filename}images/hp3562a/filter.jpg | |
| 106 | |
| 107 The PSU generates: | |
| 108 | |
| 109 - 5V @30A (!) | |
| 110 | |
| 111 - +/- 30V | |
| 112 | |
| 113 - +/- 15V | |
| 114 | |
| 115 - +8V | |
| 116 | |
| 117 - +2.6V | |
| 118 | |
| 119 The switching chopper runs at 128kHz and is regulted on the 5V output | |
| 120 rail by PWM of the primary transformer. All secondary voltages but the | |
| 121 5V are generated by linear regulators. | |
| 122 | |
| 123 | |
| 124 Next | |
| 125 ==== | |
| 126 | |
| 127 In the `next part <{filename}hp3562a_2.rst>`_, we will describe the | |
| 128 Digital Section of the instrument. |
