Rear Panel
Chapter Three: Hardware Overview
38
Signal Conditioner Board
The Signal Conditioner board provides the interface between the 670 instrument and the pressure
transducer. The board contains two connectors: an upper connector labeled “Head,” and lower
connector labeled “Signal.”
Head (Upper) Connector
The Head connector is a 15-pin female Type “D” connector that enables the 670 instrument to
connect to a pressure transducer. Refer to Table 10 for the pin assignments.
Pinout of the Head Connector Pinout (on the Signal Conditioner Board)
Pin Number
Assignment
1
Chassis Ground
2
Analog Common
3
Heater Return (-38 V)
4
Mux Input
5
No Connection
6
Signal Return
7
Signal Input
8
Heater (+38 V)
9
-13 V
10
+13 V
11
No Connection
12
Reserved
13
Preamp (+12 V)
14
System Check
15
Oscillator (6 VAC)
Table 10: Pinout of the Head Connector on the Signal Conditioner Board
Note
1. A “No Connection” pin assignment refers to a pin with no internal
connection. A “Reserved” pin assignment means that the pin has an
internal connection and may be assigned a function in the future.
2. Use pin 1 to access the pressure output signal if your 670 instrument
is connected to a 274 multiplexer.
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