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Fig.
4-6 shows the oscillator output circuit.
The common side
^
|
j
0£ the OSC OUTPUT connector
(outer metal shell of the
BNCconnector)
is floated from the chassis
( 7)7-) -
This
floating scheme is not primarily for floating voltage but for
preventing a ground loop which may be formed by connecting this
instrument to the device under measurement.
The common side
is usually connected to the chassis ground directly at an
appropriate point in the measurement setup.
For floating
requirement, however, up to 5 volts can be applied without
affecting the perfomance.
The maximum allowable floating voltage without damage is 10
volts
(peak)
as noted on the front panel (Fig.
4-5).
If a non-floating input equipment is connected to this connec¬
tor, the common side
(
)
is grounded directly.
This is a
normal state for audio frequency measurements.
The metal terminal marked with
(see Fig.
4 5)
is used to
connect a separate wire which links the chassis or to connect
the braid of a shielded wire to provide common ground.
The output of the oscillator is an unbalanced type due to the
circuit configuration shown in Fig..
4-6.
Be careful not to apply an external voltage to the OSC OUTPUT
connector accidentally.
Applying 12 volts or more across "A" in Fig.
4-6 will deteri-
orate internal components.
The maximum permissible voltage between the center conductor
of the OSC OUTPUT connector and the chassis is also 10 volts
(peak).
•CM
a' o
•x
;
4-22
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