content/hp3562a_4.rst

Thu, 05 Nov 2020 22:15:16 +0100

author
David Douard <david.douard@sdf3.org>
date
Thu, 05 Nov 2020 22:15:16 +0100
changeset 128
aba381b2bac9
parent 115
6b6e13653348
child 143
9e963e155d4c
permissions
-rw-r--r--

Fix several inter-document links

and normalize use of absolute path for {static} and {filename} links.

71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
1 ==========================================
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
2 HP3562A Dynamic Signal Analyzer - Part 4
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
3 ==========================================
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
4
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
5 :Author: David Douard
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
6 :Category: Electronics
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
7 :Tags: HP3562A, HP1345A, repair, test equipment, DSA
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
8 :series: HP 3562A
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
9 :series_index: 4
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
10
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
11 This is the part 4 of the series about my
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
12 `HP 3562A Digital Signal Analyzer <{filename}/hp3562a.rst>`_,
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
13 quickly describing the HP 1345A Digital Display unit as well as
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
14 the repair I had to do on it.
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
15
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
16
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
17 Display
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
18 =======
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
19
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
20 The display unit is a HP1345A Digital Display without the option 714
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
21 (wich adds a 4K x 16 bits Vector Memory), so it must driven by a
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
22 dedicated display controller (which is on the A38 memory board):
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
23
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
24 .. image:: {static}/images/hp3562a/a8_a17_display.png
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
25
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
26 The unit is a 6 inch monochrome display producing true vector graphics
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
27 with a resolution of 2048x2018 points. It can display up to 3226
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
28 inches of vectors at 60Hz. It also embeds a character generator.
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
29
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
30 It's a true vector display; vectors are drawn by moving the CRT beam
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
31 on the screen (it's not a pixel based display).
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
32
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
33 .. image:: {static}/images/hp3562a/hp1345a_raster_vector.png
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
34
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
35 It can diplay:
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
36
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
37 - solid lines
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
38 - solid lines with intensified end points
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
39 - short dashed lines
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
40 - long dashed lines
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
41 - dots at end points
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
42
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
43 with 3 differents visible brightness levels. It also allows to specify
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
44 4 beam velocities:
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
45
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
46 - 0.13cm/µs
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
47 - 0.25cm/µs
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
48 - 0.38cm/µs
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
49 - 0.51cm/µs
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
50
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
51 Allowing more brightness control of the vectors.
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
52
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
53 .. image:: {static}/images/hp3562a/hp1345a.jpg
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
54
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
55
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
56 If not connected with a controller, it shows a test pattern for
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
57 adjustments.
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
58
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
59 .. image:: {static}/images/hp3562a/hp1345a_test_pattern.png
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
60
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
61 The unit looks like:
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
62
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
63 .. image:: {static}/images/hp3562a/hp1345a_side.jpg
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
64
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
65 .. image:: {static}/images/hp3562a/hp1345a_side2.jpg
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
66
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
67 .. image:: {static}/images/hp3562a/hp1345a_top.jpg
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
68
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
69
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
70 Adjustment and repair
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
71 ---------------------
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
72
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
73 While the instrument was apart, I wanted to see if I can recalibrate
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
74 the display, especially try to adjust the overall brightness of the
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
75 CRT since mine is a bit dimm (I have to set the intensity knob FCW to
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
76 see the whole picture). I also wanted to improve a bit the focus and
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
77 precision of the lines.
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
78
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
79 So I took the display unit off the instrument, which is
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
80 straighforward, powered it using my benchpower supplies, and began to
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
81 read the adjustment procedure and turn the pots, when suddenly the
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
82 display shut off.
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
83
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
84 Using an ohmmeter, the diagnostic was easy: the +15v and -15v rails on
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
85 the A1 board were short. Fortunately, the schematic is available, so I
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
86 started to look for all decoupling capacitors (directly connected
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
87 between a power rail and the ground). It took me a little while before
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
88 identifing the real culprits, since the only solution to check them is
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
89 to desolder (at least one end): A1C45 and A1C48.
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
90
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
91 .. image:: {static}/images/hp3562a/hp1345a_dead_caps.jpg
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
92
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
93
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
94 These 2 small (tantalum) caps near U3 were short. Not sure why they
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
95 died when I powered the display unit with my power supplies, maybe I
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
96 set them to a bit higher voltage then what the HP3562A generates.
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
97
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
98 I replaced them with the closer spare I found (4.7µF tantalum caps),
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
99 and the Display Unit was up and running again.
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
100
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
101 I knows these old tantalum caps are prone to fail, and I should
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
102 probably change them all, but I don't have enough spare for now.
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
103
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
104 After that, I could resume my adjustement procedure. And indeed there
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
105 is an adjustment that allowed me to improve noticebly the brightness
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
106 of the screen (the Intensity Cut-Off Level). Now I can run my HP3562A
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
107 without the intensity knob FCW.
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
108
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
109
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
110 Brief description
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
111 -----------------
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
112
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
113 .. image:: {static}/images/hp3562a/hp1345a_block_diagram.png
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
114
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
115 .. image:: {static}/images/hp3562a/hp1345a_stroke_generator.png
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
116
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
117
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
118 .. image:: {static}/images/hp3562a/hp1345a_ramp_generator.png
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
119
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
120
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
121 .. image:: {static}/images/hp3562a/hp1345a_vector_processor.png
71
76d5c4108e51 [blog] new series on the HP 3562A
David Douard <david.douard@logilab.fr>
parents:
diff changeset
122
128
aba381b2bac9 Fix several inter-document links
David Douard <david.douard@sdf3.org>
parents: 115
diff changeset
123 .. image:: {static}/images/hp3562a/hp1345a_vpc_architecture.png

mercurial