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This shows you the differences between two versions of the page.

--- ge:ge_1000 [2014/10/09 03:33] – mcmaster
+++ ge:ge_1000 [Unknown date] (current) – removed - external edit (Unknown date) 127.0.0.1
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-{{:mcmaster:ge:ge_1000:overview.jpg?300}}
-{{:mcmaster:ge:ge_1000:test_setup.jpg?300}}
-**WARNING WARNING WARNING**
-X-ray machines can be dangerous if not properly used
-**WARNING WARNING WARNING**
-GE 1000 (Gendex 1000) dental x-ray head.  My machine was made 1977, Gendex split in 1983
-I was told this head was from a GX 700 but I think its actually a GX 1000.  This also matches the case markings better.  I think the terms "GE 1000" and "GX 1000" are interchangable
-Why: got Gendex USB x-ray sensor on surplus market and trying to make a PCB x-ray inspection machine
-====== Markings ======
-{{:mcmaster:ge:ge_1000:dataplate.jpg?300}}
-dataplate
-<code>
-GENERAL ELECTRIC COMPANY
-MILWAUKEE WISCONSIN   MADE IN USA
--------------------------
-GE 1000 HOUSING MODEL 46 137660610
-MINIMUM FILTRATION 20 MM ALUMINUM
-EQUIVILENT AT 100 KVP
-SERIAL 175092
--------------------------
-E1 0 TUBE INSERT MODEL 46 12539461 FOCUS 10
-MINIMUM FILTRATION 0.5 MM ALUMINUM
-EQUIVILENT AT 100 KVP
-SERIAL 42453
--------------------------
-COMPLIES WITH DHEW RADIATION PERFORMANCE
-STANDARDS, 21CFR SUBCHAPTER J
-TUBE HOUSING ASSEMBLY MANUFACTURERED
-September 1977
--------------------------
-X RAY EQUIPMENT CLASSIFIED BY UNDERWRITERS
-LABRATORIES INC WITH RESPECT TO FIRE
-SHOCK AND MECHANICAL HAZARDS ONLY
-SEE UL CLASSIFIED PRODUCT INDEX 3101
-SA
-</code>
-====== External connections ======
-{{:mcmaster:ge:ge_1000:conn_ai_ma_pi.jpg?300}}{{:mcmaster:ge:ge_1000:conn_x_g_xc.jpg?300}}
-With best guess at pinout
-Side
-    * A1
-      * HV primary1
-    * MA
-      * Current sense
-      * Probably very high ohm resistor
-      * Tie to ground if unused
-    * P1
-      * HV primary2
-Side
-    * X
-      * Fillament primary1
-    * G
-      * Ground
-    * XC
-      * Fillament primary2
-Control box is rated peak of 115 V %%*%% 18 A = 2070 W
-Resistances
-    * AI-PI: 0.4 ohm
-      * High voltage
-      * "The HV transformer has a ratio of approx 1:700, so you get 1 kV peak on the tube per volt RMS on the input. The effective output impedance of the transformer is around 500 k, leading to a drop in the HV of 500 V per mA of tube current." [4hv]
-    * X-XC: 19.2 ohm
-      * Fillament
-      * "X-Xc is the filament transformer, don't power it from 115V, normal filament running voltage is usually 50 - 70 V RMS, depending on the tube type inside the head." [4hv]
-      * 35% on my small variac (maybe around 40V) was enough to sature my 150,000 CPM rated MyGeiger2 (SBM-20)
-        * ie no clicks but actually in very high radiation
-        * hard to measure actual radiation because CPM has long averaging period
-    * G-case: 0.0 ohm
-      * Ground
-    * All others: inf
-    * MA: current monitoring
-      * Tie to ground if unused
-{{:mcmaster:ge:ge_1000:slip_ring.jpg?300}}
-Above: slip ring on arm.  I'm not using this.  One of the spring contacts can be barely seen
-====== Tube ======
-The control boxes indicate its a 100 kV, 10 mA (or 90 kV 15 mA) tube.  I get the impression this is unusually powerful.  I tend to remember someone said this unit is too powerful to use in modern dental offices but should be fine for PCB inspection
-====== 46-158800G2 controller ======
-Master control unit.  Provides correct voltages to up to three tubeheads
-From [eBay 291057383064]
-{{:ebay:toolsplusmore83:ge:46-158800g2:0.jpg?300}}{{:ebay:toolsplusmore83:ge:46-158800g2:1.jpg?300}}{{:ebay:toolsplusmore83:ge:46-158800g2:2.jpg?300}}{{:ebay:toolsplusmore83:ge:46-158800g2:3.jpg?300}}{{:ebay:toolsplusmore83:ge:46-158800g2:4.jpg?300}}{{:ebay:toolsplusmore83:ge:46-158800g2:5.jpg?300}}{{:ebay:toolsplusmore83:ge:46-158800g2:6.jpg?300}}{{:ebay:toolsplusmore83:ge:46-158800g2:7.jpg?300}}{{:ebay:toolsplusmore83:ge:46-158800g2:8.jpg?300}}
-====== 46-181123G1 remote control ======
-{{:mcmaster:ge:ge_1000:control1.jpg?300}}{{:mcmaster:ge:ge_1000:control2.jpg?300}}{{:mcmaster:ge:ge_1000:control3.jpg?300}}
-Provides remote control, came with my tubehead.  The main controller was still in use for a bit longer so wasn't able to take it but might be able to get it in a few months
-mA and 10 mA scale.  Someone mentioned that
--18109B meter board
-    * Makes display read 100kVp @ 118 VAC
-====== References ======
-    * 4hv thread that helped me get it going: [[http://4hv.org/e107_plugins/forum/forum_viewtopic.php?166075.last|http://4hv.org/e107_plugins/forum/forum_viewtopic.php?166075.last]]
-    *  [[http://serviceimaging.com/gendex/download/miscellaneous/Spareparts/ETB_Gendex_20050505_01_en.pdf|http://serviceimaging.com/gendex/download/miscellaneous/Spareparts/ETB_Gendex_20050505_01_en.pdf]]
-      * Very useful document with equipment pictures, descriptions, and part numbers from the original system
-    *  [[http://christophergranz.com/?p=39|http://christophergranz.com/?p=39]]
-      * GX-1000 tubehead teardown
-      * Has a number of useful comments
-    *  [[https://www.youtube.com/watch?v=RsU74R_vdnM|https://www.youtube.com/watch?v=RsU74R_vdnM]]
-      * Video of someone cutting open what I think is the same model
-    *  [[http://omr-cods.tripod.com/casestudy4a.htm|http://omr-cods.tripod.com/casestudy4a.htm]]
-      * An x-ray head teardown
-    * eBay [[http://www.ebay.com/usr/toolsplusmore83?_trksid=p2047675.l2559|toolsplusmore83]]: item 291057383064