81233-4r1
Page 8 of 9
7.2
Pin connections
The low voltage signal connections are made by a 15
way ‘D’ connector;
the pin out is
shown below:
Pin #
Signal Name
Range
1
+24V input
2
Power Ground
3
Preheat (set value)
0
–
5V from internal pre set
4
Test (Filament Current Direct Program)
Do not connect
5
HV enable
Digital input
6
Filament stable
Digital output
7
High voltage program output
0
–
10V from internal pre set
8
High voltage program input
0
–
10V input
9
High voltage monitor
0
–
10V output
10
Emission current monitor
0
–
10V output
11
Filament current monitor
0
–
10V output
12
Emission current program input
0
–
10V input
13
Emission current program output
0
–
10V from internal pre set
14
Signal ground
15
Pre-set maximum filament current set value
0
–
10V from internal pre set
The filament Preheat level and current limit are set by internal presets accessible through the case side.
If external high voltage control is not required link pins 7 and 8.
If external emission current control is not required link pins 12 and 13.
7.3
Filament Output
The filament output is via two tri rated 16/02 conductor wires:-
7.4
HV output
The HV output is via a 500mm long un-terminated URM76 LSF screened cable.
Colour
Name
Red
F
Black
Filament-
