18
Modulometer calibration and its use
There are 3 scales and 1 legend printed on the face of the instrument:
o
Logarithmic–scale markings in
relative dB from –
?
to +3 dB
indicating the output level.
o
Linear–scale markings in absolute
voltage from 0 to 1.4 Volts
corresponding to the –
?
to +3 dB
scale referenced to 1.0 Volt at the
output connectors.
o
Green areas indicating the limits
for the power supply.
o
A written legend, “0 dB = 1.0 V”,
printed on the lower center portion
of the dial on the instrument,
reminds the user that all markings
are referenced to 0 dB = 1.0 Volt
on the output connectors.
The modulometer can be used to
adjust the volume and balance
potentiometers for reaching:
o
A proper balance between left and
right channels,
o
Recorded level differences
between various recordings.
o
With the correct adjustment of the
power amplifier input, it can be
used to measure the output level
of the amplifier as well as a very
precise indication in the event of
saturation.
