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Analog Terminal Board
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Jumpers Settings, W1-W4.
There are four jumpers on the ATB. The functions are
summarised in Figure 1-2.
Jumpers W1 and W2 are used only in with the thermocouple
cold junction compensation circuitry. W1 connects the CH0 input
to the cold junction circuit whilst W2 connects the CH0 return
line to ANALOG ground.
Jumper W3 connects the system ground, SYS GND, to the
ANALOG ground. Single Ended inputs normally have a return
path via analog ground and this jumper connects the analog
ground to SYS GND.
Jumper W4 connects the AMPLOW to the ANALOG ground.
Pseudo differential inputs are referenced to AMPLOW. This
jumper can be used in conjunction to W3 to connect AMP LOW
to the system ground SYS GND.
Jumper Settings
W1
W2
In
In
Out
Out
Out
Out
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Differential Analog Inputs, 8DI.
Always use the 8 Differential input scheme, in preference
to any other scheme, where ever possible and also when:-
a)
using low level input signals, (less than 1 Volt full scale).
b)
in noisy environments.
c)
there is no common ground shared by the analog signal
sources.
The 10k Ohm Differential return path resistors should be fitted,
______________________ _
Figure 1-2. Jumper Table.
Input Types
W3
W4
In
In
Active Thermocouple CJC
In
In
4-20mA Current Inputs
In
In
Voltage Inputs
Reference
Page 3
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