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NOTE:
In this arrangement, the output of the unit should be programmed OFF before the relays
are switched. This is because if the load leads are opened before the sense leads, the
overvoltage protection circuit will trip if it is enabled.
Figure 3-3. Remote Sense Connections with External Relays
Figure 3-4 shows how to connect remote sense leads when using a removable test fixture. Note that in
this configuration, the wires in the part of the test fixture where the phone is located must be less than 20
inches in length. This is for stability ase well as for the fact that the remote sense leads cannot
compensate for the voltage drop in this part of the test fixture.
Figure 3-4. Remote Sense Connections with Test Fixture
HP 66311A OUTPUT
CONNECTOR
-S
-
+
+S
TWIST PAIR
WIRE RESISTANCE
HP 66311A OUTPUT
CONNECTOR
-S
-
+
+S
TWIST PAIR
WIRE RESISTANCE
FIXTURE
CONNECTIONS
SENSE
Local
Remote
SENSE
SWITCH OUT
TWIST LEADS
+
_
DISCONNECT RELAYS
SENSE
Local
Remote
SENSE
SWITCH OUT
TWIST LEADS
LENGTH
MUST BE
UNDER 20
INCHES
+
_
TWIST LEADS
Installation - 3
LOAD
LOAD
21
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