content/LPD422FM.rst

Tue, 19 Apr 2016 23:19:42 +0200

author
David Douard <david.douard@logilab.fr>
date
Tue, 19 Apr 2016 23:19:42 +0200
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[tek] typos

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

mercurial