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| ge:ge_1000 [2015/03/05 07:20] – [Teardown] mcmaster | ge:ge_1000 [Unknown date] (current) – removed - external edit (Unknown date) 127.0.0.1 | ||
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| - | aka Gendex GX-1000, General Electric GE 1000 | ||
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| - | **WARNING WARNING WARNING** | ||
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| - | X-ray machines can be dangerous if not properly used | ||
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| - | **WARNING WARNING WARNING** | ||
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| - | GE 1000 (Gendex 1000) dental x-ray head. My machine was made 1977, Gendex split in 1983 | ||
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| - | 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. | ||
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| - | Why: got Gendex USB x-ray sensor on surplus market and trying to make a PCB x-ray inspection machine | ||
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| - | ====== Markings ====== | ||
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| - | dataplate | ||
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| - | < | ||
| - | GENERAL ELECTRIC COMPANY | ||
| - | MILWAUKEE WISCONSIN | ||
| - | ------------------------- | ||
| - | 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 | ||
| - | </ | ||
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| - | ====== External connections ====== | ||
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| - | With best guess at pinout | ||
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| - | Side | ||
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| - | * A1 | ||
| - | * HV primary1 | ||
| - | * MA | ||
| - | * Current sense | ||
| - | * Probably very high ohm resistor | ||
| - | * Tie to ground if unused | ||
| - | * P1 | ||
| - | * HV primary2 | ||
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| - | Side | ||
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| - | * X | ||
| - | * Fillament primary1 | ||
| - | * G | ||
| - | * Ground | ||
| - | * XC | ||
| - | * Fillament primary2 | ||
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| - | Control box is rated peak of 115 V< | ||
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| - | Resistances | ||
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| - | * 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." | ||
| - | * X-XC: 19.2 ohm | ||
| - | * Fillament | ||
| - | * "X-Xc is the filament transformer, | ||
| - | * 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 | ||
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| - | Above: slip ring on arm. I'm not using this. One of the spring contacts can be barely seen | ||
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| - | ====== Tube ====== | ||
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| - | The control boxes indicate its a 100 kV, 10 mA (or 90 kV 15 mA) tube. I get the impression this is unusually powerful. | ||
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| - | ====== 46-158800G2 controller ====== | ||
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| - | Master control unit. Provides correct voltages to up to three tubeheads | ||
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| - | From [eBay 291057383064] | ||
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| - | ====== 46-181123G1 remote control ====== | ||
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| - | Provides remote control, came with my tubehead. | ||
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| - | 15 mA and 10 mA scale. | ||
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| - | 46-18109B meter board | ||
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| - | * Makes display read 100kVp @ 118 VAC | ||
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| - | ====== Tubehead schematic ====== | ||
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| - | Above: best guess at schematic | ||
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| - | Above: T2, the isolating filament transformer. | ||
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| - | Above: T1, the high voltage transformer (HV side). | ||
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| - | ====== References ====== | ||
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| - | * 4hv thread that helped me get it going: [[http:// | ||
| - | * [[http:// | ||
| - | * Very useful document with equipment pictures, descriptions, | ||
| - | * [[http:// | ||
| - | * GX-1000 tubehead teardown | ||
| - | * Has a number of useful comments | ||
| - | * [[https:// | ||
| - | * Video of someone cutting open what I think is the same model | ||
| - | * [[http:// | ||
| - | * An x-ray head teardown | ||
| - | * eBay [[http:// | ||