Cable for the IG2200 Ion Gauge Controller
        -------------------------------------------


                                        Initial Rev.  26-Feb-2023
                                        Current Rev.  10-Mar-2023


This note describes the cable that runs between the JC Controls
aka Kurt Lesker IG2200  Ion Gauge Controller  and  the Ion Gauge
Tube itself.


     IG2200
   Controller      Wire                 Wire Function
   Pin Number     Color           Ion Gauge Tube Connection
   ----------    -------     -------------------------------------

        1          Red        FILAMENT  Has a 6 Amp fuse in the
                              Controller.  The connected Orange
                              stub wire and contact go to the
                              Internal Coating Pin  if it exists
                              on the specific Ion Gauge Tube.

        3         Brown       FILAMENT


        7         Yellow      GRID   The controller biases this
                              pin to +180 Volts DC wrt Ground.

        9         Green       GRID   Note this controller uses
                              I sqrd R  heating to de-gas the
                              tube - up to 7 Volts and 8 Amps AC
                              which flows through this second
                              Grid pin via a thyristor I presume.


Pins  2,4,5,6,8  have no-connection inside the Ion Gauge
Controller and there is no wire in the cable for these pins.


On the Ionization Gauge Tube itself, there are 4 pins in a
row.   Of these 4 pins, the 2 pins nearest the center are the
Filament pins  and  the 2 outer pins are the Grid connections.

In the center, perpendicular to the row of 4 pins, there may
be two pins on one side of the row  and  a single pin on the
other side of the row.

If it exists on a specific tube, the single pin on one side
of the row connects to the tube's Internal Coating.  Connect
the Orange contact to this tube pin,  i.e. the second contact
on the Red wire.  Many Ionization Gauge Tubes do not have an
Internal Coating in which case leave the Orange contact lead
disconnected.

If there are two pins on the other side perpendicular to
the row of 4 pins, leave them disconnected.

You may also run into ionization gauge tubes with 2 Filaments.
This is usually implemented as 2 Filament pins and a Filament
Center Tap pin.   Connect one Filament lead to the Center Tap
pin  and  connect the other Filament lead to the pin for
whichever filament you want to use.


View Looking at the Tube's Pins:



                    X    ---------- Grid        Yellow
No
Electrical
Connection          X    ---------- Filament    Red

         X    X           X    ---- Internal Coating   Orange

to these            X    ---------- Filament    Brown
2 Pins on
the Left
                    X    ---------- Grid        Green



Each  "X"  represents a tube pin.

On a given tube the 2 no connect pins on the left
and/or  the Internal Coating pin on the right
may not exist.