Mcmaster: Created page with "aka Gendex GX-1000, General Electric GE 1000 300 px 300 px '''WARNING WARNING WARNING'..."

2019-03-09T06:35:09Z

Created page with "aka Gendex GX-1000, General Electric GE 1000 300 px 300 px '''WARNING WARNING WARNING'..."

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aka Gendex GX-1000, General Electric GE 1000

[[File:mcmaster_ge_ge_1000_overview.jpg|300 px]]

[[File:mcmaster_ge_ge_1000_test_setup.jpg|300 px]]

'''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 =

[[File:mcmaster_ge_ge_1000_dataplate.jpg|300 px]]

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 =

[[File:mcmaster_ge_ge_1000_conn_ai_ma_pi.jpg|300 px]][[File:mcmaster_ge_ge_1000_conn_x_g_xc.jpg|300 px]]

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<nowiki> *</nowiki> 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

[[File:mcmaster_ge_ge_1000_slip_ring.jpg|300 px]]

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]

[[File:ebay_toolsplusmore83_ge_46-158800g2_0.jpg|300 px]][[File:ebay_toolsplusmore83_ge_46-158800g2_1.jpg|300 px]][[File:ebay_toolsplusmore83_ge_46-158800g2_2.jpg|300 px]][[File:ebay_toolsplusmore83_ge_46-158800g2_3.jpg|300 px]][[File:ebay_toolsplusmore83_ge_46-158800g2_4.jpg|300 px]][[File:ebay_toolsplusmore83_ge_46-158800g2_5.jpg|300 px]][[File:ebay_toolsplusmore83_ge_46-158800g2_6.jpg|300 px]][[File:ebay_toolsplusmore83_ge_46-158800g2_7.jpg|300 px]][[File:ebay_toolsplusmore83_ge_46-158800g2_8.jpg|300 px]]

= 46-181123G1 remote control =

[[File:mcmaster_ge_ge_1000_control1.jpg|300 px]][[File:mcmaster_ge_ge_1000_control2.jpg|300 px]][[File:mcmaster_ge_ge_1000_control3.jpg|300 px]]

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 =

[[File:mcmaster_ge_ge_1000_schem.png|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

[[File:mcmaster_ge_ge_1000_xformer_iso_label.jpg|300 px]]

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

[[File:mcmaster_ge_ge_1000_xformer_hv_label.jpg|300 px]]

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 =

* https://plus.google.com/photos/117750254503792451904/albums/6123017805050079313
** Test shots
* 4hv thread that helped me get it going: [http://4hv.org/e107_plugins/forum/forum_viewtopic.php?166075.last]
* [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]
** GX-1000 tubehead teardown
** Has a number of useful comments
* [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]
** An x-ray head teardown
* eBay [http://www.ebay.com/usr/toolsplusmore83?_trksid=p2047675.l2559 toolsplusmore83]: item 291057383064

GE1000 - Revision history

Mcmaster: Created page with "aka Gendex GX-1000, General Electric GE 1000 300 px 300 px '''WARNING WARNING WARNING'..."