Lencore Spectra Classic: LP-2 - Manual (Page 3)

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Notes
15
Menu flow chart
16
INTRODUCTION
The Lencore Model LP-2 Programmable Timer is a two zone electronic attenuator
when attached to the blue and black wires of model LM-6 master sound masking
units. Raising of masking levels is simulated only. That is, the highest level of sound
masking is the same as if the timer were not attached to the blue and black wires
of the masters.
There are three separate areas of attenuation. Each hour of the 24 hours in a day
has a programmed attenuation value in the range of 0 dB to -9 dB inclusive. The
zone slide controls have an attenuation range of -5 dB to +5 dB inclusive. Finally the
acclimation setting has a programmed attenuation range of -1 dB to -9 dB
inclusive. If acclimation is turned off or has timed out, attenuation is 0 dB.
The total attenuation that is displayed, and output to each zone, is the sum of the
dB setting for the current hour of the day
** , plus the zone slide control dB setting,
plus the acclimation db setting. Note that the maximum total attenuation possible
is -18 dB even if the programming gives a result beyond this.
** Please take into account the minutes per dB setting for this particular hour
to determine at what minute final attenuation is reached. This applies only if
the previous hour setting is different from the current hour.
The two zones can be programmed independently except the acclimation dB's
that are common to both. Each day of the week can be programmed differently
also. For example Saturday and Sunday can be programmed different from Friday.
From the menu driven screens on the display you can select the zone, the day, the
hour and enter the amount of attenuation desired. Often the default attenuation
settings are adequate for most office situations and no programming is necessary.
There are approximately 35 different screens or menus that can be displayed. You
can follow the flow of these screens in the menu flow chart provided. Once finished
you should always return to the main screen, the one that shows the date, time and
zone dB values.
DISPLAY
The liquid crystal display (LCD) has 4 lines of 20 characters each. In the main screen
line 1 shows the date. Line 2 shows the day of week, time of day, the letter A for
A.M. or P for P.M.