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| ge:ge_1000 [2014/09/23 06:19] – mcmaster | ge:ge_1000 [2015/03/06 22:40] – mcmaster | ||
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| + | aka Gendex GX-1000, General Electric GE 1000 | ||
| + | |||
| {{: | {{: | ||
| + | |||
| + | {{: | ||
| **WARNING WARNING WARNING** | **WARNING WARNING WARNING** | ||
| Line 12: | Line 16: | ||
| Why: got Gendex USB x-ray sensor on surplus market and trying to make a PCB x-ray inspection machine | Why: got Gendex USB x-ray sensor on surplus market and trying to make a PCB x-ray inspection machine | ||
| - | |||
| ====== Markings ====== | ====== Markings ====== | ||
| Line 45: | Line 48: | ||
| SA | SA | ||
| </ | </ | ||
| - | |||
| ====== External connections ====== | ====== External connections ====== | ||
| - | {{: | + | {{: |
| - | {{: | + | |
| With best guess at pinout | With best guess at pinout | ||
| Side | Side | ||
| + | |||
| * A1 | * A1 | ||
| * HV primary1 | * HV primary1 | ||
| Line 60: | Line 62: | ||
| * Current sense | * Current sense | ||
| * Probably very high ohm resistor | * Probably very high ohm resistor | ||
| + | * Tie to ground if unused | ||
| * P1 | * P1 | ||
| * HV primary2 | * HV primary2 | ||
| Side | Side | ||
| + | |||
| * X | * X | ||
| * Fillament primary1 | * Fillament primary1 | ||
| Line 71: | Line 75: | ||
| * Fillament primary2 | * Fillament primary2 | ||
| - | Control box is rated peak of 115 V * 18 A = 2070 W | + | Control box is rated peak of 115 V< |
| Resistances | Resistances | ||
| - | * AI-PI: 0.4 ohm | ||
| - | * @ 110 V: W = V^2 / R = 115^2 / 0.4 = 33062 W | ||
| - | * Way too much power | ||
| - | * Maybe has capacitor? | ||
| - | * Probably HV | ||
| - | * X-XC: 19.2 ohm | ||
| - | * @ 110 V: W = V^2 / R = 115^2 / 19.2 = 689 W | ||
| - | * Too high to be fillament at line | ||
| - | * Probably fillament | ||
| - | * G-case: 0.0 ohm | ||
| - | * Ground | ||
| - | * All others: inf | ||
| - | * MA is N/C? | ||
| + | * 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 | ||
| + | |||
| + | {{: | ||
| + | |||
| + | Above: slip ring on arm. I'm not using this. One of the spring contacts can be barely seen | ||
| ====== Tube ====== | ====== 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. | The control boxes indicate its a 100 kV, 10 mA (or 90 kV 15 mA) tube. I get the impression this is unusually powerful. | ||
| - | |||
| ====== 46-158800G2 controller ====== | ====== 46-158800G2 controller ====== | ||
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| From [eBay 291057383064] | From [eBay 291057383064] | ||
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| ====== 46-181123G1 remote control ====== | ====== 46-181123G1 remote control ====== | ||
| - | {{: | + | {{: |
| - | {{: | + | |
| - | {{: | + | |
| Provides remote control, came with my tubehead. | Provides remote control, came with my tubehead. | ||
| Line 121: | Line 119: | ||
| 46-18109B meter board | 46-18109B meter board | ||
| - | * Makes display read 100kVp @ 118 VAC | ||
| + | * Makes display read 100kVp @ 118 VAC | ||
| + | |||
| + | |||
| + | ====== Tubehead schematic ====== | ||
| + | |||
| + | {{: | ||
| + | |||
| + | Above: best guess at schematic. | ||
| + | |||
| + | {{: | ||
| + | |||
| + | Above: T2, the isolating filament transformer. | ||
| + | |||
| + | {{: | ||
| + | |||
| + | Above: T1, the high voltage transformer (HV side). | ||
| ====== References ====== | ====== References ====== | ||
| + | * https:// | ||
| + | * Test shots | ||
| + | * 4hv thread that helped me get it going: [[http:// | ||
| * [[http:// | * [[http:// | ||
| * Very useful document with equipment pictures, descriptions, | * Very useful document with equipment pictures, descriptions, | ||