content/eip545b.rst

Tue, 28 Aug 2018 15:12:24 +0200

author
David Douard <david.douard@logilab.fr>
date
Tue, 28 Aug 2018 15:12:24 +0200
changeset 109
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parent 82
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permissions
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[prologix] minor improvments

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1 ===============================
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2 EIP 545B RF Frequency Counter
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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: test equipment, RF, EIP, 545B, counter
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8 :series: EIP545B Frequency Counter
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9 :series_index: 1
73
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12 I recently purchased a broken EIP 545B microwave frequency counter on ebay. It
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13 was very inexpensive (around 150€ delivered), but obviously, non working.
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15 .. image:: {filename}images/eip545b/closed_unit.jpg
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16 :alt: The EIP 545B RF Counter
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17
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18 The device was described as "does not power up", an is clearly not in very good
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19 condition. Quite dirty, battered, with the band 2 BNC connector ruined.
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20
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21 But inside, it was **very** dusty and a bit rusty:
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22
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23 .. image:: {filename}images/eip545b/inside.jpg
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24 :alt: Once opened, it's very dusty
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25
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26 The YIG filter looking not so good:
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27
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28 .. image:: {filename}images/eip545b/rusty_yig.jpg
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29 :alt: The rusty YIG filter
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32 I quickly checked, and indeed, nothing happened when I tried to power it up. In
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33 fact, the fuse was blown. So, instead of just give a try with a new fuse, I
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34 decided to disassemble it completely to clean it up, check the power supply
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35 independtly, then inserting the boards one at a time.
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37
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38 PSU
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39 ===
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40
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41 So the first step has been to check wether the PSU is working fine. Overall, it
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42 looks OK:
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44 .. image:: {filename}images/eip545b/psu.jpg
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45 :alt: The A101 PSU board
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46
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47 There are many tantalum capacitors in this unit, including on the PSU board:
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48
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49 .. image:: {filename}images/eip545b/psu_tantalums.jpg
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50 :alt: Tantalum capacitors on the PSU board
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51
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52 But they seem OK, so I gave it a try with no load, but using a variac to rise
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53 the input voltage slowly:
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54
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55 .. image:: {filename}images/eip545b/psu_test.jpg
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56 :alt: Testing the PSU board
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58 I plan to build myself a nice isolation transformer unit using this variac, a
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59 true isolation transformer I have and the power meter shown on this picture,
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60 but that's another story.
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62 The results are ok so far, voltages are OK. The PSU seems to work just fine.
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63
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64 Cleaning the unit
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65 =================
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67 The next step has been to completely disasseble the counter in order to clean
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68 it properly.
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70 It's a quite simple unit, easy to disassemble, so it took me only a few hours
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71 to do so.
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73 My only complain is to be obliged to disolder a few wires to disassemble the
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74 components from the back panel.
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75
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76 I'e washed every part I could in my kitchen sink, with dishwashing soap and a
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77 duster, includind the A100 interconnect board.
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78
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79 Other PCB board have been cleaned with a small tooth brush, some cloth, and
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80 isopropyl alcohol.
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81
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82 I also tried to remove a bit of the rust from the YIG filter using some
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83 scotch-brite, but I could not really clean it without disassembling it, and I'm
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84 not sure wether it is safe to open the enclosure of the YIG filter or not (if
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85 it's sealed with special gas for example). Also, I wanted to check if it works
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86 before doing anythno stupid.
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87
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88 Reassembling and testing
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89 ========================
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90
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91 Then I started to reassemble the unit, just putting back togother the front
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92 panel, the CPU and the PSU.
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93
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94 Once powered, nothing happened, the display did not lit... It happened I forgot
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95 to put back the 7805 regulator dedicated to the front panel (and mounted on the
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96 aluminium chassis for heat dissipation). Doh!
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97
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98 Once fixed, the unit did power up, and reacted to some keys:
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99
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100 .. image:: {filename}images/eip545b/test_cpu.jpg
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101 :alt: Testing the unit with only the CPU board
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102
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103 So far so good. Now the time for testing the other boards.
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104
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105 After inserting all the boards but the optional A102 GPIB board, the unit still
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106 powered up, but the keyboard was mostly unresponsive, and the "remote" led was
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107 lit. Putting back the GPIB board did the trick.
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108
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109 I also had to plug the 10MHz In/Out switch back (located on the back panel),
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110 since the default (open) position is for "External Reference".
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111
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112 Now I can interact with the device. In band 3, and I can hear a small noise,
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113 typical for a YIG coil sweeping the range... Good sign!
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114
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115 Let's put some signal, first a 6MHz on the band 1 input:
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116
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117 .. image:: {filename}images/eip545b/working_band1.jpg
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118 :alt: Testing a 6MHz signal on band 1 input
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119
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120 It works! I quickly checked band 2 (using a piece of wire since the connector
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121 is broken), and it seems to work fine. And band 3:
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122
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123 .. image:: {filename}images/eip545b/working_band3.jpg
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124 :alt: Testing a 1GHz signal on band 3 input
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125
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127 I've checked up 2GHz, the max frequency I can generate using my Anristu MG3670B
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128 signal generator.
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129
82
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130 A quick test showed that the sensitivity is not as expected: could not measure
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131 any signal below -12 ou -13dBm.
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132
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133
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134 Next steps
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135 ==========
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136
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137 Next steps for this unit are now:
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138
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139 1. Finishing the repair, changing the broken BNC connector, the broken fan
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140 (which was in fact the culprit for the blown fuse), as well as, maybe,
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141 removing the rust from the YIG filter.
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142
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143 2. Make some performance tests and calibrations (as far as I can do using my
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144 equipment).
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145
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146 3. I also want to try to install the Option 2 (Power Meter). This procedure is
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147 pretty simple (as long as I manage to program a few 2716 EPROMs with my
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148 `MiniPro TL866`_ universal programmer) and has been done by several_
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149 people_, but always on the 545A model, not the B model. Not sure if I can
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150 use the EPROM images kindly provided by GBPPR_...
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151
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152
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153
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154 .. _people: http://www.qsl.net/n/n9zia//vision/EIP_545A_Modification_Instructions.pdf
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155 .. _several: http://www.simonsdialogs.com/2014/09/eip-545a-microwave-counter-power-meter-upgrade/
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156 .. _GBPPR: http://www.qsl.net/n/n9zia/vision/
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157 .. _`MiniPro TL866`: http://autoelectric.cn/EN/TL866_main.html

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