Sedecal SHF-310 - Page 70

HF Series Generators
Installation
IN-1052R0
36
4. Each type of Ion Chamber requires a specified reference voltage for
“Area Selections” and “AEC Reset” signals:
G Vacutec, AID and Comet Ion Chambers require GND (TB1-10).
G MEDYS, CGR-BVM, GE and Philips Amplimat Ion Chambers
require +24 VDC (TB1-4).
The r eference voltage is provided from: TB1-7 “Relay 1” for IC1; TB1-6
“Relay 2” for IC2; TB1-5 “Relay 3” for IC3; and TB1-8 “ Relay 4” for IC4.
For each group of Ion Chambers of the same type, connect a wire
between each of the above mentioned terminals to TB1-10 (GND), TB1-4
(+24 VDC) or TB1-3 (+12 VDC) depending on the voltage required
(examples: for four MEDYS Ion Chambers add only a wire-jumper
between TB1 -7 and TB1-4; or for one MEDYS Ion Chamber as IC-1 and
one COMET Ion Chamber as IC-2 add a wire-jumper between TB1-7 and
TB1-4, and another wire between TB1-6 and TB1-10).
DO NOT TURN ON THE GENERATOR UNTIL THE INPUT
SIGNALS OF ALL THE ION CHAMBERS ARE CONNECTED TO
THE REQUIRED VOLTAGE. OTHER VOLTAGE MIGHT
DAMAGE THE ION CHAMBERS.
5. Ion Chambers output must be 0 VDC when there is no-radiation
(No-Offset adjustment). If an Ion C hamber output has an offset, it must
be adjusted to 0 VDC with the respective Potentiometer.
Configure Jumpers from JP9 to JP12 and turn ON the Generator only to
adjust the following Potentiometers (if needed) according to the Ion
Chamber output:
I
O
N
C
H
A
M
B
E
R
O
U
T
P
U
T
JUMPERS POSITION
ION CH
A
MBER OUTPUT
JP9 (IC1) JP10 (IC2) JP11 (IC3) JP12 (IC4)
NO-OFFSET ADJUSTMENT A A A A
OFFSET ADJUSTMENT B B B B
TEST POINT AND POTENTIOMETER
(ONLY IF JUMPER IS IN “B” POSITION)
TP1 -- R11 TP2 -- R8 TP4 -- R2 TP12 -- R5