Using The Modulometer - Nagra PL-P Owner's Instruction Manual

With the internal jumpers removed,
the EQ curve will conform to a 1978
RIAA addendum for the inclusion of
a -3 dB rumble filter at 30 Hz.
With the internal jumpers installed,
the EQ curve will not include the –3
dB rumble filter at 30 Hz. This
setting is designed for use with
extremely high-quality
where rumble is generally not a
concern.
5. Line A, Line B and Line C
input level adjustment
As supplied from the factory, all trim
pots within the PL-P are set to
represent 1.0 V sensitivity at 0 dB
on the modulometer.
adjustments can
accommodate specific installation
requirements.
On the inside left of the PL-P case
is a printed circuit board which is
connected to the input connectors
of Line A, Line B and Line C.

Using the modulometer

Description
The PL-P is equipped with a highly
precise multiple-purpose
modulometer. It has 2 coaxial
pointers, the black representing the
Left Channel
representing the Right Channel.
The face of the instrument is
graduated with 3 scales and can be
illuminated by 2 internal LEDs.
The modulometer is a precision
instrument with very special pointer
ballistics.
turntables
However,
be made to
Nagra
and the red
Directly above
connectors are a pair of trim pots,
designed to be adjusted using the
supplied miniature blue jeweler's
screwdriver.
There are three pairs of trim pots in
total.
Each pair of trim pots can be used
to adjust
corresponding
clockwise turn
adjustment screw in the center of
the trim pot, the input level is
increased; with a counterclockwise,
the level is decreased.
This adjustment technique is used
to balance the levels to avoid
variations across Phono, Line A,
Line B and Line C.
Used in conjunction
modulometer, as described below,
the user can also maximize system
performance
optimum operating range for each
input source and the PL-P.
A modulometer is different from a
VU or a PPM meter. They share a
common purpose of indication, and
a brief description of each follows:
• Modulometer
The modulometer measures the
peak value
irrespective of the form or the
level, and
consideration
positive or negative value. It is
equipped with a memory, so that
with very
19
each pair
the level of
input. With
of the white
with the
by selecting the
of the signal,
takes into
the strongest
brief signals, the
of
its
a