GE1000

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aka Gendex GX-1000, General Electric GE 1000

Mcmaster ge ge 1000 overview.jpg

Mcmaster ge ge 1000 test setup.jpg

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

dataplate

 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

External connections

Mcmaster ge ge 1000 conn ai ma pi.jpgMcmaster ge ge 1000 conn x g xc.jpg

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

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.jpgEbay toolsplusmore83 ge 46-158800g2 1.jpgEbay toolsplusmore83 ge 46-158800g2 2.jpgEbay toolsplusmore83 ge 46-158800g2 3.jpgEbay toolsplusmore83 ge 46-158800g2 4.jpgEbay toolsplusmore83 ge 46-158800g2 5.jpgEbay toolsplusmore83 ge 46-158800g2 6.jpgEbay toolsplusmore83 ge 46-158800g2 7.jpgEbay toolsplusmore83 ge 46-158800g2 8.jpg

46-181123G1 remote control

Mcmaster ge ge 1000 control1.jpgMcmaster ge ge 1000 control2.jpgMcmaster ge ge 1000 control3.jpg

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

15 mA and 10 mA scale. Someone mentioned that

46-18109B meter board

  • Makes display read 100kVp @ 118 VAC


Tubehead schematic

mcmaster_ge_ge_1000_schem.png

Above: best guess at schematic. 60VAC in does produce 3.6VAC out, but its still unclear if that is the correct input voltage

Mcmaster ge ge 1000 xformer iso label.jpg

Above: T2, the isolating filament transformer. The bottom lug connectors are actually soldered to T1

Mcmaster ge ge 1000 xformer hv label.jpg

Above: T1, the high voltage transformer (HV side). Both sides run at high voltage. The x-ray tube assembly is spring loaded against T1.2

References