Mercurial > whatever / changeset

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/10MHz_ref.rst	Thu Mar 10 22:18:00 2016 +0100
@@ -0,0 +1,102 @@
+==========================================
+ Building a bench 10MHz reference: part 1
+==========================================
+
+:author: David Douard
+:date: 2016-02-21
+:Category: Electronics
+:Tags: test equipment, 10MHz, Rubidium
+
+
+Many electronics test equipment need an accurate time base. Most
+often, it's build on a 10MHz base.
+
+For quite a while now, I have a used rubidium frequency and time
+reference (Efratom Model LPRO-101) waiting for a nice enclosure. I
+also have a small Extron Electronics video signal amplifier I thought
+I could use to make my freq reference able to provide its signal to
+several test equipments at once.
+
+The Rubidium Frequency Reference
+================================
+
+The device is a small enclosure with only a 2x5 pins connector:
+
+.. image:: {filename}images/freq_ref/efratom.jpg
+   :alt: The Efratom LPRO-101 frequency standard.
+      
+The exact model is an Efratom Rubidium Frequency Standard Model LPRO-101:
+
+.. image:: {filename}images/freq_ref/efratom_sticker.jpg
+   :alt: The Efratom LPRO-101 frequency standard.
+
+Inside the enclosure, there is a single PCB with SMD and trough hole
+components. It's quite dense.
+
+.. image:: {filename}images/freq_ref/efratom_inside.jpg
+   :alt: The PCB of the Efratom LPRO-101 frequency standard.
+
+The rubidium lamp with the resonant cavity occupy almost 1/4 of the
+total area. The cover of the enclosure is compartimented, mainly to
+shield the lamp+cavity device from the remaining of the board:
+
+.. image:: {filename}images/freq_ref/efratom_enclosure.jpg
+   :alt: The enclosure of the Efratom LPRO-101 frequency standard.
+
+
+The Rubidium Freq Ref seems to workjust fine. I've powered it a few
+times, and it take a few minutes to lock the lamp and stabilize the
+output frequency. I've made a quick measurement of the power
+consumption; at startup time, the current goes up to 1.5A, but after a
+while, it stabilize around 0.5 or 0.6A. According a voltage 24VDC, it
+starts with 36W then goes down to 15 or 16W.
+
+Now, I have to embed it in a nice enclosure (preferably an aluminium
+one so I can use is as a heatsink, since the frequency reference
+produces a bit of heat.)
+
+The Extron Video Amplifier
+==========================
+
+The video amplifer on the other hand has a bit of a trouble:
+
+.. image:: {filename}images/freq_ref/extron.jpg
+   :alt: the Extron Electronics video amplifier
+      
+As you can see on the picture above, the inductor is broken, and there
+is no visible mark on it. This inductor is used to produce the
+symetric voltages required to poser the opamp used to dispatch the
+signal.
+
+The switching power modules used on the board is a LT1616_ (marked as
+LTNB on the S6 package). So I reversed engineered a bit the schematic
+of the power to try to guess what kind of value this double inductor
+could be, since the reference schematic in the datasheet does not use
+such a dual inductor(/transformer).
+
+Fro the schematic I could extract, it appeared that the design is in
+fact very close to the reference schematic proposed by LT in the
+datasheet_, in the Bipolar Output DC/DC Converter configuration page
+16:
+
+.. image:: {filename}images/freq_ref/lt1616_bipolar_output_DC2DC.svg
+   :alt: LT1616 Bipolr Output DC/DC converter.
+
+It produces +/-5V from the 12V input. But still, I did not know what
+kind of inductor/xformer I should use. I did not notice at first sight
+the two references for the inductor that are proposed in the reference
+design. So I first searched using the nice faceted search tool of
+digikey (reducing the selection according the informations I have on
+the broken device and then looking at the pictures), I finally could
+find the reference of the inductor. By the way, it's a Sumida CLS62
+Series inductor (as indicated in the datasheet). And according to the
+reference design, it should be a 22µH one. So let's make a purchase
+for this inductor as well as some 20k resistors for my HP8904A_.
+
+.. _HP8904A: {filename}hp8904a.rst
+
+
+
+
+.. _LT1616: http://www.linear.com/product/LT1616
+.. _datasheet: http://cds.linear.com/docs/en/datasheet/lt1616fs.pdf

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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
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+      <tspan
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+         x="423.84528 428.22058"
+         y="170.21771"
+         sodipodi:role="line"
+         id="tspan3512">5V</tspan>
+      <tspan
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+         x="423.84528 428.22058 432.59592 436.97122 443.77921"
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+         sodipodi:role="line"
+         id="tspan3514">200mA</tspan>
+      <tspan
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+         x="423.84528 429.19193 434.53854"
+         y="237.72003"
+         sodipodi:role="line"
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+      <tspan
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+         x="423.84528 428.74564 433.12094"
+         y="315.53934"
+         sodipodi:role="line"
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+      <tspan
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+         x="423.84528 428.22058 432.59592 436.97122 443.77921"
+         y="325.54129"
+         sodipodi:role="line"
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+      <tspan
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+         y="255.01126"
+         sodipodi:role="line"
+         id="tspan3522">C1: TAIYO-YUDEN TMK316BJ105ML</tspan>
+      <tspan
+         style="font-size:8.75062466px;font-variant:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:Helvetica;-inkscape-font-specification:Helvetica-Condensed"
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+         sodipodi:role="line"
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+      <tspan
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+         sodipodi:role="line"
+         id="tspan3526">C5: TAIYO-TUDEN JMK107BJ105MA</tspan>
+      <tspan
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+         sodipodi:role="line"
+         id="tspan3528">D1, D3: ON SEMICONDUCTOR MBR0530</tspan>
+      <tspan
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+         sodipodi:role="line"
+         id="tspan3530">D2: 1N4148</tspan>
+      <tspan
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+         x="143.82529 148.20061 152.5759 154.76358 156.95122 161.32654"
+         y="305.02109"
+         sodipodi:role="line"
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+    <text
+       transform="scale(0.99992856,1.0000714)"
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+       x="165.70184"
+       y="305.02109"
+       style="font-size:14.99892807px">
+      <tspan
+         style="font-size:8.75062466px;font-variant:normal;font-weight:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:Symbol;-inkscape-font-specification:Symbol"
+         x="165.70184"
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+       x="170.7422"
+       y="305.02109"
+       style="font-size:14.99892807px">
+      <tspan
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+         sodipodi:role="line"
+         id="tspan3540">H 1:1 SUMIDA CLS62-220 OR</tspan>
+      <tspan
+         style="font-size:8.75062466px;font-variant:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:Helvetica;-inkscape-font-specification:Helvetica-Condensed"
+         x="143.82527 156.95122 161.81656 167.16319 169.59587 173.97118 178.3465 183.69312 189.03975 194.38638 196.81906 201.6844 206.54976 208.73741 213.60275 217.97807 222.84341 227.21873 231.59404 234.50801"
+         y="315.02304"
+         sodipodi:role="line"
+         id="tspan3542">COILTRONICS CTX20-1</tspan>
+      <tspan
+         style="font-size:8.75062466px;font-variant:normal;writing-mode:lr-tb;fill:#000000;fill-opacity:1;fill-rule:nonzero;stroke:none;font-family:Helvetica;-inkscape-font-specification:Helvetica-Condensed"
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+         sodipodi:role="line"
+         id="tspan3544">–5V LOAD SHOULD BE LESS THAN</tspan>
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+         x="143.82527 148.20059 150.63326 155.00858 157.19623 161.57155 166.43689 168.62454 172.99986 178.3465 183.21184 188.55847 190.74612 192.93378 197.79913 202.17444 206.54976 208.73741 214.08405 218.45935 223.32471 225.75737 231.104 236.45064 238.63829 243.98492 249.33156 253.70686 258.08218 260.26984 264.64514 269.02045"
+         y="337.52966"
+         sodipodi:role="line"
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+         y="83.709"
+         sodipodi:role="line"
+         id="tspan3592">Bipolar Output DC/DC Converter</tspan>
+    </text>
+  </g>
+</svg>