content/hp3562a.rst

Wed, 13 Mar 2024 11:03:13 +0100

author
David Douard <david.douard@sdf3.org>
date
Wed, 13 Mar 2024 11:03:13 +0100
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Update URLs for pcb & firmware to sourcehut

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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:: {static}/images/hp3562a/front.jpg
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32 :alt: Front view of the HP3562A DSA
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33
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34 I said the beast, because despite being an amazing piece of test
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35 equipment, it's also very big (576mm x 426mm x 222mm), very heavy
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36 (26kg) and... unfortunately quite loud.
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37
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38 My version of the instrument is rather "recent", and manuals available
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39 on Keysight web site concern only the earliest models
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40 (ref. 03563-90210) and are of poor quality, with missing pages etc. So
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41 I bought the correct Service Manual (HP ref. 03562-90213) on ebay from
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42 `Artek Media`_.
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43
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44 .. _`Artek Media`: http://www.artekmedia.com/
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45
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46 Since it was on my "bench", I decided to see a bit inside, using the
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47 occasion to investigate and fix the only real problem I have (as far
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48 as I know) with my device: the dimm display.
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49
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50 .. image:: {static}/images/hp3562a/front_open.jpg
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51 :alt: Inside the HP3562A DSA
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52
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53 The unit consist in mostly 4 parts:
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54
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55 - a big switching power supply (with huge capacitors) on the left side
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56 of the enclosure, under the display,
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57
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58 - the display unit: a very nice HP1435A Digital Display; we'll discuss
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59 it a bit more later,
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60
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61 - the digital section consisting in 8 boards (rear right),
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62
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63 - the analog section consisting in 6 boards (front right).
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66 The general block diagram:
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67
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68 .. image:: {static}/images/hp3562a/hp3562a_block_diagram_new.png
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69 :alt: General block diagram of the HP3562A
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70
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71 The instrument is built around 2 buses:
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72
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73 - the control bus which allows the main CPU to control all the
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74 assemblies, and
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75
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76 - the global bus which is used to transfer measurement data between
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77 assemblies.
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78
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79 In the HP3562A, the process control is distributed away from the
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80 system CPU: each assembly has its own processor or state machine which
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81 controls its local operations. The main CPU tells each assembly which
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82 process to execute and monitors the overall functionning and data
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83 processing of the instrument.
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84
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85 For the record, the block diagram from Service Manual 03562-90219
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86 looks like:
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87
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88 .. image:: {static}/images/hp3562a/block_diagram.png
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89 :alt: General block diagram of the HP3562A from earliest Service Manual
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92 Power Supply
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93 ============
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95 .. image:: {static}/images/hp3562a/hp3562a_a18_psu_block_diagram.png
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96 :alt: Block diagram of the switching power supply unit
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97
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99 .. image:: {static}/images/hp3562a/a18_psu.jpg
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100 :alt: Picture of the HP3562A A18 PSU PCB board
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101
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102 The primary capacitors are huge Sprague caps (1400µF 250V):
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103
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104 .. image:: {static}/images/hp3562a/caps.jpg
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105 :alt: Picture of the HP3562A main filter capacitors
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106
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107 The power line filter is also pretty impressive:
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109 .. image:: {static}/images/hp3562a/filter.jpg
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110 :alt: Picture of the HP3562A line filter module
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111
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112 The PSU generates:
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113
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114 - 5V @30A (!)
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115
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116 - +/- 30V
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117
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118 - +/- 15V
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119
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120 - +8V
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121
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122 - +2.6V
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123
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124 The switching chopper runs at 128kHz and is regulted on the 5V output
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125 rail by PWM of the primary transformer. All secondary voltages but the
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126 5V are generated by linear regulators.
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127
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128
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129 Next
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130 ====
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131
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132 In the `next part <{filename}/hp3562a_2.rst>`_, we will describe the
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133 Digital Section of the instrument.

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