SIS Documentation
SIS3800
Scaler/Counter
Page 22 of 39
12.2 NIM
The 50
Ω
input termination can be removed in groups of four channels by removing the
corresponding resistor networks. The termination of single control inputs can be disabled with
jumpers J101 through J108, an open jumper disables the termination of the corresponding
channel.
Network
Channels
U15 (Pins 10 to 6)
1-4
U15 (Pins 1 to 5)
5-8
U35 (Pins 10 to 6)
9-12
U35(Pins 1 to 5)
13-16
U55 (Pins 10 to 6)
17-20
U55 (Pins 1 to 5)
21-24
U75 (Pins 10 to 6)
25-28
U75 (Pins 1 to 5)
29-32
U115 (Pins 10 to 6) Control 1-4
U115 (Pins 1 to 5)
Control 5-8
The schematics of the NIM input circuitry is shown below.
+
-
Ref=-0.35 V
GND
50
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