3D
AEC Calibration
CPI Canada Inc.
Page 3D-18
Rev. D Millenia / Indico 100 Series Service Manual Ch # 740904-06
3D.2.7 AEC Board (Universal AEC Board) Cont
The following table shows the pinouts for the 12 pin connectors J1 to J4 on the AEC board in figure 3D-10
and 3D-11. The pins on J7 are all connected in parallel, thus the PMT high voltage may be taken from any of
the pins on that connector.
The connections to the AEC pickup chamber vary considerably between ion chambers and solid
state chambers. For clarity two tables are shown below, the first for ion chambers and the second for solid
state chambers.
FUNCTION PIN
NOTE
+500 VDC output
1
+500, +300, +50 VDC outputs provided for ion
+300 VDC output
2
chamber use if required. +12, -12, -24 VDC
+50 VDC output
3
outputs are typically used as the DC supply for
+12 VDC output
4
a pre-amplifier, often part of the ion chamber.
-12 VDC output
5
-24 VDC output
6
The start command, and left, middle, right
Ground
7
field select outputs are jumper configured to
Start command output
8
be active high or active low as per the AEC
Left field select
9
chamber requirements. The signal input is
Middle field select
10
jumper configured to accept a positive going
Right field select
11
or negative going ramp or DC signal as per
Signal input
12
the AEC chamber output.
Table 3D-8: Ion chamber connections
FUNCTION PIN
NOTE
+500 VDC output
1
Not used for solid state AEC chambers
+300 VDC output
2
Not used for solid state AEC chambers
+50 VDC output
3
Not used for solid state AEC chambers
+12 VDC output
4
Not used for solid state AEC chambers
-12 VDC output
5
Not used for solid state AEC chambers
-24 VDC output
6
Not used for solid state AEC chambers
Ground
7
Connect pin 8 to pin 7 (ground). Connect the
Start
8
common anodes for left, middle, right to pin 8.
Left 9
Connect
cathode
(left)
to
LEFT, cathode middle
Middle 10
to
MIDDLE, and cathode right to RIGHT.
Right
11
Cable shield (if used) connects to pin 8.
Signal input
12
Not used for solid state AEC chambers
Table 3D-9: Solid state chamber connections
