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1. Connect the phone to the dc source and place it in standby mode.
2. Check the last two digits of the voltage reading on the front panel of the dc source.
3. If the last two digits are fluctuating, it is an indication that the phone capacitance may be less than
5 µF and the dc source is momentarily unstable.
4. Place the output compensation of the dc source in Low Mode.
5. If the last two digits of the voltage reading are now stable, your phone has an input capacitance less
than 5 µF.
Local Sensing
Remote sensing is preferred when connecting the output of the dc source to the load. However, you may
also connect the output to the load without remote sensing provided that you observe the following:
Keep load leads as short as possible. Load leads cannot exceed 18 inches (per side) when local
♦
sensing.
♦
Bundle or twist the leads tightly together to minimize inductance.
Set the Sense switch on the back of the unit to Local by pushing it in.
♦
NOTE:
You must set the sense switch to the Local setting if you are connecting the load leads to
the front panel binding posts and are not using the remote sense connections.
HP 66311A OUTPUT
CONNECTOR
-S
-
+
+S
EACH LEAD MUST
BE LESS THAN 20
INCHES IN LENGTH
Figure 3-5. Local Sensing
SENSE
Local
Remote
SENSE
SWITCH IN
TWIST LEADS
+
_
WIRE RESISTANCE
Installation - 3
LOAD
23
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