I
Decade
Capacitor
From
supply
Neutral
Box
Electronic Wattmeter
c
c
I .
Chapter 2
Trans former
Under
Test
Fig 2. 7 Method
of
increasing sensitivity when measuring
the iron loss
of
a mains transformer
2.8 Amplifier Power
Measurement
Loudspeaker
0
•
0
When the output from
an
amplifier is being measured, the
amplifier output should
be
connected to the terminals labelled
'LOAD'
and the dummy load or loudspeaker connected to the
terminals labelled 'SUPPLY',
as
in
fig
2.8.
If possible, connect the wattmeter common to the amplifier
common or ground.
In
this way any power consumed
by
the current-measuring
circuit as
well as that
in
the load is indicated
on
the wattmeter,
giving a more accurate reading. Also the direct connection
between the amplifier ground and
the.
wattmeter common
avoids capacity
problems at higher frequencies.
REVERSE
mpse Voltse
DO
::{J:
jj:_
Amplifier
EW604
Fig 2.8
1 7
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