content/hp3562a_4.rst

Wed, 16 Oct 2019 21:53:47 +0200

author
David Douard <david.douard@sdfa3.org>
date
Wed, 16 Oct 2019 21:53:47 +0200
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1 ==========================================
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2 HP3562A Dynamic Signal Analyzer - Part 4
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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, HP1345A, repair, test equipment, DSA
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8 :series: HP 3562A
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9 :series_index: 4
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10
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11 This is the part 4 of the series about my
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12 `HP 3562A Digital Signal Analyzer <{static}hp3562a.rst>`_,
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13 quickly describing the HP 1345A Digital Display unit as well as
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14 the repair I had to do on it.
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15
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16
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17 Display
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18 =======
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19
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20 The display unit is a HP1345A Digital Display without the option 714
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21 (wich adds a 4K x 16 bits Vector Memory), so it must driven by a
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22 dedicated display controller (which is on the A38 memory board):
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23
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24 .. image:: {static}images/hp3562a/a8_a17_display.png
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25
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26 The unit is a 6 inch monochrome display producing true vector graphics
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27 with a resolution of 2048x2018 points. It can display up to 3226
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28 inches of vectors at 60Hz. It also embeds a character generator.
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29
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30 It's a true vector display; vectors are drawn by moving the CRT beam
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31 on the screen (it's not a pixel based display).
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32
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33 .. image:: {static}images/hp3562a/hp1345a_raster_vector.png
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34
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35 It can diplay:
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36
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37 - solid lines
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38 - solid lines with intensified end points
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39 - short dashed lines
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40 - long dashed lines
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41 - dots at end points
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42
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43 with 3 differents visible brightness levels. It also allows to specify
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44 4 beam velocities:
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45
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46 - 0.13cm/µs
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47 - 0.25cm/µs
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48 - 0.38cm/µs
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49 - 0.51cm/µs
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50
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51 Allowing more brightness control of the vectors.
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53 .. image:: {static}images/hp3562a/hp1345a.jpg
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55
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56 If not connected with a controller, it shows a test pattern for
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57 adjustments.
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59 .. image:: {static}images/hp3562a/hp1345a_test_pattern.png
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61 The unit looks like:
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63 .. image:: {static}images/hp3562a/hp1345a_side.jpg
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65 .. image:: {static}images/hp3562a/hp1345a_side2.jpg
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67 .. image:: {static}images/hp3562a/hp1345a_top.jpg
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70 Adjustment and repair
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71 ---------------------
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72
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73 While the instrument was apart, I wanted to see if I can recalibrate
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74 the display, especially try to adjust the overall brightness of the
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75 CRT since mine is a bit dimm (I have to set the intensity knob FCW to
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76 see the whole picture). I also wanted to improve a bit the focus and
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77 precision of the lines.
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78
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79 So I took the display unit off the instrument, which is
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80 straighforward, powered it using my benchpower supplies, and began to
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81 read the adjustment procedure and turn the pots, when suddenly the
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82 display shut off.
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83
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84 Using an ohmmeter, the diagnostic was easy: the +15v and -15v rails on
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85 the A1 board were short. Fortunately, the schematic is available, so I
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86 started to look for all decoupling capacitors (directly connected
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87 between a power rail and the ground). It took me a little while before
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88 identifing the real culprits, since the only solution to check them is
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89 to desolder (at least one end): A1C45 and A1C48.
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91 .. image:: {static}images/hp3562a/hp1345a_dead_caps.jpg
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94 These 2 small (tantalum) caps near U3 were short. Not sure why they
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95 died when I powered the display unit with my power supplies, maybe I
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96 set them to a bit higher voltage then what the HP3562A generates.
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97
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98 I replaced them with the closer spare I found (4.7µF tantalum caps),
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99 and the Display Unit was up and running again.
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100
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101 I knows these old tantalum caps are prone to fail, and I should
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102 probably change them all, but I don't have enough spare for now.
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103
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104 After that, I could resume my adjustement procedure. And indeed there
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105 is an adjustment that allowed me to improve noticebly the brightness
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106 of the screen (the Intensity Cut-Off Level). Now I can run my HP3562A
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107 without the intensity knob FCW.
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109
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110 Brief description
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111 -----------------
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