content/10MHz_ref.rst

changeset 115
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20 The Rubidium Frequency Reference 20 The Rubidium Frequency Reference
21 ================================ 21 ================================
22 22
23 The device is a small enclosure with only a 2x5 pins connector: 23 The device is a small enclosure with only a 2x5 pins connector:
24 24
25 .. image:: {filename}images/freq_ref/efratom.jpg 25 .. image:: {static}images/freq_ref/efratom.jpg
26 :alt: The Efratom LPRO-101 frequency standard. 26 :alt: The Efratom LPRO-101 frequency standard.
27 27
28 The exact model is an Efratom Rubidium Frequency Standard Model LPRO-101: 28 The exact model is an Efratom Rubidium Frequency Standard Model LPRO-101:
29 29
30 .. image:: {filename}images/freq_ref/efratom_sticker.jpg 30 .. image:: {static}images/freq_ref/efratom_sticker.jpg
31 :alt: The Efratom LPRO-101 frequency standard. 31 :alt: The Efratom LPRO-101 frequency standard.
32 32
33 Inside the enclosure, there is a single PCB with SMD and through hole 33 Inside the enclosure, there is a single PCB with SMD and through hole
34 components. It's quite dense. 34 components. It's quite dense.
35 35
36 .. image:: {filename}images/freq_ref/efratom_inside.jpg 36 .. image:: {static}images/freq_ref/efratom_inside.jpg
37 :alt: The PCB of the Efratom LPRO-101 frequency standard. 37 :alt: The PCB of the Efratom LPRO-101 frequency standard.
38 38
39 The rubidium lamp with the resonant cavity occupy almost a quarter of the 39 The rubidium lamp with the resonant cavity occupy almost a quarter of the
40 total area. The cover of the enclosure is compartimented, mainly to 40 total area. The cover of the enclosure is compartimented, mainly to
41 shield the lamp+cavity device from the remaining of the board: 41 shield the lamp+cavity device from the remaining of the board:
42 42
43 .. image:: {filename}images/freq_ref/efratom_enclosure.jpg 43 .. image:: {static}images/freq_ref/efratom_enclosure.jpg
44 :alt: The enclosure of the Efratom LPRO-101 frequency standard. 44 :alt: The enclosure of the Efratom LPRO-101 frequency standard.
45 45
46 46
47 The Rubidium Freq Ref seems to workjust fine. I've powered it a few 47 The Rubidium Freq Ref seems to workjust fine. I've powered it a few
48 times, and it take a few minutes to lock the lamp and stabilize the 48 times, and it take a few minutes to lock the lamp and stabilize the
58 The Extron Video Amplifier 58 The Extron Video Amplifier
59 ========================== 59 ==========================
60 60
61 The video amplifer on the other hand has a bit of a trouble: 61 The video amplifer on the other hand has a bit of a trouble:
62 62
63 .. image:: {filename}images/freq_ref/extron.jpg 63 .. image:: {static}images/freq_ref/extron.jpg
64 :alt: the Extron Electronics video amplifier 64 :alt: the Extron Electronics video amplifier
65 65
66 As you can see on the picture above, the inductor is broken, and there 66 As you can see on the picture above, the inductor is broken, and there
67 is no visible mark on it. This inductor is used to produce the 67 is no visible mark on it. This inductor is used to produce the
68 symetric voltages required to poser the opamp used to dispatch the 68 symetric voltages required to poser the opamp used to dispatch the
77 Fro the schematic I could extract, it appeared that the design is in 77 Fro the schematic I could extract, it appeared that the design is in
78 fact very close to the reference schematic proposed by LT in the 78 fact very close to the reference schematic proposed by LT in the
79 datasheet_, in the Bipolar Output DC/DC Converter configuration page 79 datasheet_, in the Bipolar Output DC/DC Converter configuration page
80 16: 80 16:
81 81
82 .. image:: {filename}images/freq_ref/lt1616_bipolar_output_DC2DC.svg 82 .. image:: {static}images/freq_ref/lt1616_bipolar_output_DC2DC.svg
83 :alt: LT1616 Bipolar Output DC/DC converter. 83 :alt: LT1616 Bipolar Output DC/DC converter.
84 :align: center 84 :align: center
85 85
86 It produces +/-5V from the 12V input. But still, I did not know what 86 It produces +/-5V from the 12V input. But still, I did not know what
87 kind of inductor/xformer I should use. I did not notice at first sight 87 kind of inductor/xformer I should use. I did not notice at first sight
92 find the reference of the inductor. By the way, it's a Sumida CLS62 92 find the reference of the inductor. By the way, it's a Sumida CLS62
93 Series inductor (as indicated in the datasheet). And according to the 93 Series inductor (as indicated in the datasheet). And according to the
94 reference design, it should be a 22µH one. So let's make a purchase 94 reference design, it should be a 22µH one. So let's make a purchase
95 for this inductor as well as some 20k resistors for my HP8904A_. 95 for this inductor as well as some 20k resistors for my HP8904A_.
96 96
97 .. _HP8904A: {filename}hp8904a.rst 97 .. _HP8904A: {static}hp8904a.rst
98 98
99 99
100 100
101 101
102 .. _LT1616: http://www.linear.com/product/LT1616 102 .. _LT1616: http://www.linear.com/product/LT1616

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