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AP034-OM-E Rev D
gently slide the larger cover off by pulling it away from the
probe tip end.
4.
Connect the AP034 Active Differential Probe output to the
female end of the ProBus Extension Cable. Be careful to align
the ProBus pins with the corresponding connector correctly.
Connect the male end of the ProBus Extension Cable to
Channel 1 of the oscilloscope.
The Logic board is connected to the
Amplifier
board
connectors.
mechanical fasteners holding the two boards
together. A small foam pad mounted on the
circuit board ensures that the connectors
remain engaged while the assembly is
mounted
within
housing. Be sure that the connectors
between the boards are firmly engaged
before
applying
Operating the probe without the logic board
will not damage it. However, to ensure
reliable operation, the logic board should
only be mated with the Amplifier board with
the power
connector disengaged.
5.
Apply power to the oscilloscope and to the other test
instrumentation. Allow at least 30 minute's warm-up time for
the AP034 Active Differential Probe and test equipment
before continuing the calibration procedure.
The probe tip cover also serves to thermally
stabilize the input circuitry. The differential
input stage of the probe utilizes discrete
transistors
that
approximate match of junction temperatures
for correct DC balance. With the covers
removed, this circuitry is susceptible to drift
caused by air currents flowing over the
ISSUED: January 2000
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Note
by
four
small
There
are
no
additional
the
ProBus
power
to
the
removed,
and
the
Note
need
to
maintain
8-pin
interface
probe.
ProBus
an
²
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