DigitalFlow™ GF868 Service Manual (1 and 2-Channel) 11
Chapter 1. Calibration
1.6 Testing the Alarm Relays
Alarm relays may be added to the Model GF868 by installing an Alarms Option Card in one (or more) of the six
expansion slots. Each option card includes three alarm relays, which are designated as A, B, and C. To test the alarm
relays, connect an ohmmeter to the option card terminal block as shown in Figure 4. Refer to the menu map in Figure 6
on page 15 as a guide.
Figure 4: Typical Ohmmeter Connections
For this discussion, assume that the option card has been installed in
Slot x.
Terminal Block (Option Card)
A
COM
A
B
A
NO
C
C
B
B
-
+
Ohmmeter
1
9
C
NC
COM
COM
NO
NC
NO
NC
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