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D. Connect the CDG
Make sure that the CDG is securely connected to the vacuum system, using good vacuum
practice.
E. Attach the CDG Cable
The CDG cable has a 9-pin D-sub connector on one end, which plugs into the 908A, see Figure
4, below. There are a variety of conventions for connection to the CDG; you may assemble or
modify the cable to adapt to the CDG as needed. Connect the 9-pin D-sub plug of the gauge cable
to the 9-pin connector on the back of the 908A controller unit. Push the plug onto the connector
until it is firmly in place. Tighten the retaining screws to make certain the connector remains in
place. Loose connections can cause faulty readings.
Figure 4: Model 908A Sensor Connector -- 9 Pin Female D-Sub Connector
NOTE
The following information will allow you to make modifications to the ca-
ble as needed to interface with your CDG. Please refer to Figure 4 above;
this shows the 9-pin connector which is on the rear panel of the 908A. This
connector has female sockets; the mating connector on the CDG cable must
have male pins
908A 9-pin ‘D’
to MKS Baratron 15-pin ‘D’
908A Pin
Terranova Name
Color
Tube Pin/Connection Name
1
Tube #1 Signal
white
to: Tube#1, Pin 2/Signal Output
2
Tube #2 Signal
white
to: Tube#2, Pin 2/Signal Output
3
Tube #2 Signal Return brown
to: Tube#2, Pin 12/Signal Common
4
+15 volts
red
to: Tube#1, Pin 7/+15 VDC
5
+15 volts
red
to: Tube#2, Pin 7/+15 VDC
6
-15 volts
green
to: Tube#1, Pin 6/-15 VDC
7
-15 volts
green
to: Tube#2, Pin 6/-15 VDC
8
Tube #1 Signal Return brown
to: Tube#1, Pin 12/Signal Common
9
Electronics Common
black/shield to: Tube#1,Pins5/Pwr.Comm & 15/& Chassis Gnd
9
Electronics Common
black/shield to: Tube#2,Pins5/Pwr.Comm & 15/& Chassis Gnd
Figure 5: 908A -- MKS Baratron Pin Connections (15 pin)
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