For instance, for a 600-ohm line of a uniform impedance
on both input and output sides, gain or loss can be
readily known by the output dB minus input dB. If the
impedance is other than 600 ohms on one side or on both
sides, each decibel measured only serves to compare their
voltage level.
In this case, the different impedances can be unified to
600-ohm level by reading the matching graph given
on page 26.
The power level can be compared by
the decibel values thus obtained.
The AC voltage ranges of the
U-50
d
measure decibel
by reading the dB scales provided in pair on the bottom
of the scale dial.
a Range Selection. Any AC voltage range may be
used for decibel measurement,
b Test Lead Connections.
See GENERAL INST
RUCTIONS^.
Before taking a decibel measurement, a condenser
of 0.1-2 microfarads is connected in series with either
-f or - jack.
Do not use an electrolytic capacitor.
c
Scale Reading.
Use the scales in pair on the bot
tom of the scale dial marked
dB.
The upper scale
25
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