content/LPD422FM.rst

Tue, 28 Aug 2018 15:05:01 +0200

author
David Douard <david.douard@logilab.fr>
date
Tue, 28 Aug 2018 15:05:01 +0200
changeset 104
8396e709bde5
parent 49
26e34edd2984
child 115
6b6e13653348
permissions
-rw-r--r--

improve hgignore

48
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
1 =============================
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
2 Lambda LPD 422 FM Bench PSU
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
3 =============================
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
4
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
5 :Author: David Douard
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
6 :Category: Electronics
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
7 :Tags: test equipment, PSU
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
8
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
9 This post is a quick presentation and teardown of a small bench power
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
10 supply I bought on ebay a few weeks ago for something like 40€.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
11
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
12 .. image:: {filename}/images/lambda/lpd422fm_overall.jpg
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
13 :alt: The Lambda LPD 422 FM dual regulated power supply.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
14
49
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
15 It's an old unit, not sure it's exact age, but the components inside
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
16 the unit seem to have date codes around 1971/1972. So my unit is
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
17 probably from the late 1972 (older than me!). This series of power
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
18 supplies seem to have been built for a very long period, since one of
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
19 the available user manual on the internet seems to be dated from 1987
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
20 (but it's for the "A" version).
48
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
21
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
22 Overview
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
23 ========
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
24
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
25 It's a dual regulated linear power supply which specifications are:
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
26
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
27 - voltage range: 0V to 40V
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
28 - curent regulation: 0 to 1A current limitation
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
29 - voltage regulation: 0.01% + 1mV
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
30 - ripple and noise: 500 µVrms, 1.5mVpp
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
31
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
32
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
33 It seems to be "remote programmable", and have remote sensor entries
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
34 on the back of the unit.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
35
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
36 .. image:: {filename}/images/lambda/lpd422fm_back.jpg
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
37 :alt: Rear view of the LPD 422 FM dual regulated power supply.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
38
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
39 Inside the enclosure:
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
40
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
41 .. image:: {filename}/images/lambda/lpd422fm_top.jpg
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
42 :alt: Top view of the LPD 422 FM dual regulated power supply.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
43
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
44 Each of the 2 power supplies have a regulator board on each side of
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
45 the enclosure. The power transformer is sitting at the center of the
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
46 enclosure and shows a nice "Component Location Diagram":
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
47
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
48 .. image:: {filename}/images/lambda/lpd422fm_xformer.jpg
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
49 :alt: The power transformer of the LPD 422 FM dual regulated power supply.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
50
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
51 A regulator board looks like:
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
52
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
53 .. image:: {filename}/images/lambda/lpd422fm_board2.jpg
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
54 :alt: Top view of one regulator of the LPD 422 FM dual regulated
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
55 power supply.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
56
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
57 .. image:: {filename}/images/lambda/lpd422fm_board1.jpg
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
58 :alt: Bottom view of one regulator of the LPD 422 FM dual regulated
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
59 power supply.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
60
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
61 The component, especially the big caps, looks like original parts and
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
62 the PCB is a bit burnt by the small power transistor, but nothing too
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
63 scary.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
64
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
65 The power supply works nice. No smoky or smelly behaviour on load, and
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
66 the regulation looks still reasonnable.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
67
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
68
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
69 Available documentations
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
70 ========================
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
71
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
72 - `Lambda LP, LPD & LPT series catalog
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
73 <{filename}/pdfs/lambda/LAMBDA_LPD_LPD_LPT_series.pdf>`_
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
74
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
75 - `Instruction and Service Manual for Lambda LPD suffix A Series Power
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
76 Supplies <{filename}/pdfs/lambda/LambdaLPD.pdf>`_: this is not
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
77 exactly the same model, but it really very close.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
78
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
79
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
80
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
81 Quick mesurements
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
82 =================
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
83
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
84 In these quick measurements, I've not used the voltage remote sensing
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
85 of the power supply.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
86
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
87 First, a view of the noise at the output of the PSU; 0V, no load:
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
88
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
89 .. image:: {filename}/images/lambda/DS1Z_QuickPrint2.png
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
90 :alt: Noise level of the LPD422FM - 0V/0A
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
91
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
92 Same at 20V, no load:
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
93
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
94 .. image:: {filename}/images/lambda/DS1Z_QuickPrint3.png
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
95 :alt: Noise level of the LPD422FM - 20V/0A
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
96
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
97 And at maximum voltage (40V, no load):
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
98
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
99 .. image:: {filename}/images/lambda/DS1Z_QuickPrint4.png
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
100 :alt: Noise level of the LPD422FM - 40V/0A
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
101
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
102 Then, with the `ZPB30A1 electronic load <{filename}/ZPB30A1.rst>`
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
103 connected but not consuming any current (20V, 0A):
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
104
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
105 .. image:: {filename}/images/lambda/DS1Z_QuickPrint5.png
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
106 :alt: Noise level of the LPD422FM connected to the ZPB30A1 - 20V/0A
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
107
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
108 As you can see, there is a much higher injected by the electronic
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
109 load. When measuring the visible pattern:
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
110
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
111 .. image:: {filename}/images/lambda/DS1Z_QuickPrint6.png
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
112 :alt: Noise level of the LPD422FM connected to the ZPB30A1 - 20V/0A
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
113
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
114 it's a 20ms pattern, ie. it's the mains 50Hz being injected... Let's
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
115 turn the load on (20V, 0.5A):
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
116
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
117 .. image:: {filename}/images/lambda/DS1Z_QuickPrint7.png
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
118 :alt: Noise level of the LPD422FM connected to the ZPB30A1 - 20V/0.5A
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
119
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
120 The injected noise from the mains has vanished, and the RMS noise
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
121 level is back to the same value as it ws with no load (around 40mV).
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
122
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
123 At 1 amp, it's roughly the same:
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
124
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
125 .. image:: {filename}/images/lambda/DS1Z_QuickPrint8.png
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
126 :alt: Noise level of the LPD422FM connected to the ZPB30A1 - 20V/1A
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
127
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
128 Now, trying to capture the transient curve when activating and
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
129 deactivating the load. As I cannot remote control the load, I cannot
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
130 create a nice square load pattern which make this measurement much
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
131 easier. So I've just adjusted the trigger level to single capture the
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
132 moment I press the 'on/off' button of the load:
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
133
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
134 .. image:: {filename}/images/lambda/DS1Z_QuickPrint10.png
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
135 :alt: Transient response of the LPD422FM connected to the ZPB30A1 - 20V/1A -> 0A
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
136
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
137 .. image:: {filename}/images/lambda/DS1Z_QuickPrint11.png
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
138 :alt: Transient response of the LPD422FM connected to the ZPB30A1 - 20V/0A -> 1A
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
139
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
140 The overshoot is around 75mV and takes around 200ms to vanish, and the
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
141 undershoot is a bit less (50mV) and lasts 150ms.
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
142
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
143 At one amp, the ripple voltage is around 8mVpp and 3mVrms:
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
144
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
145 .. image:: {filename}/images/lambda/DS1Z_QuickPrint13.png
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
146 :alt: Ripple voltage of the LPD422FM connected to the ZPB30A1 - 20V/1A
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
147
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
148 It's quite out of spec: ripple should be less than 500µVrms and
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
149 1.5mVpp, but it's not really a surprise considering the age (over 40
49
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
150 years old!) of the PSU. A future recap may improve its performances
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
151 back to its original specifictions.
48
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
152
49
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
153 I also plan to replace the banana jacks on the front panel (their
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
154 barrels are very short, less than 1cm: I cannot plug a standard banana
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
155 plug more than half its lenght). I may also try to bring the remote
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
156 sensor plugs on the front panel (with a pair of easy to set or remove
26e34edd2984 [LPD422FM] typos
David Douard <david.douard@logilab.fr>
parents: 48
diff changeset
157 jumps): I like to have the sense terminals ready to use.
48
0a7b1c6b1796 [LPD422FM] new blog about the LPD 422 FM regulated power supply
David Douard <david.douard@logilab.fr>
parents:
diff changeset
158

mercurial