content/hp3562a.rst

Fri, 22 Sep 2017 00:13:22 +0200

author
David Douard <david.douard@logilab.fr>
date
Fri, 22 Sep 2017 00:13:22 +0200
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[zr24w] blog post about the HP ZR24W PSU repair

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

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