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(1)
Minimize the output power of the amplifier under measurement when
interconnection lead wires are connected or disconnected.
(2)
Do not disconnect the "Common" lead in Fig.
4—14 during measurement.
If it is required,
disconnect "Output line" or connection between
the load RL and the VP-7721A prior to the "Common" lead.
(3)
When it is required to provide a measurement fixture,
such as signal
selector switch,
insert it between the load RL and the VP—7721A.
If it is essential to insert such a fixture between the amplifier and
the load RL, the switching timing should be so arranged that the common
side is switched during the disconnected period of the "Output line".
(4)
Never connect'a BTL type
(balanced,
transformer-less type)
power
amplifier to the input connector in non—floating arrangement.
Use the
floating connection for this type of amplifier.
4.5
Distortion Measurement using Internal Oscillator
a)
Basic operation is the same as that described in Section 4.3.
Connect the device to be tested to the analyzer as shown rn Fig.
4_15^
in this connection,
the analyzer acts as an automatic tuning
distortion measurement set.
VP-7721A
audio analyzer
Fig.
4-15
Distortion measurement connection using internal oscillator
Ol
Q
CM
n
CJ
.n
4-29
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