Lem Elettronica AT450SAW, Руководство пользователя

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6) B II (and BI) and B III input level adjustment.
The B II and B III inputs are provided with level attenuators from 0 to –20 dB.
Procedure
-
press the “UP” or “DOWN” key to select
b1.00.
or
b3.00.
on the display.
-
press the “ENTER” key. The display will start blinking. This indicates the parameters’ setting mode.
-
press “UP” or “DOWN” to adjust the band I and band III cluster attenuation level.
- press “ENTER” again to confirm your choice.
NOTE: the attenuation settings will be cancelled without pressing the “ENTER” key for
confirmation at the procedure’s end.
7) Clusters Self-Alignment Setting
SELF-ALIGNMENT can be used after programming all the UHF clusters. Running this function the
programmable amplifier will automatically level all clusters to get an equalized and optimized output.
To set the SELF-ALIGNMENT select the
L. E. v. L.
menu and press the ENTER key, when the
display start flashing press again the key ENTER and the display show the word
A D J
followed by
a moving cursor. Wait till the procedure is finished.
The SELF-ALIGNMENT algorithm provides an UHF output level standard of 100 dBµV.
With input UHF signals ≥ 70 dBµV the inter-stage attenuator will be set at – 10dB level. This allows an
output level range that can be set from 90 dBµV to 110 dBµV.
With input UHF signals ≥ 60 dBµV and ≤ 70 dBµV the inter-stage attenuator will be set at 0 dB.
This allow an output level range that can be set from 80 dBµV to 100 dBµV.
With input UHF signals that are too low, to guaranty a good Signal/Noise ratio the display alert will
show the cluster number followed by the symbol
Lo
. Press the key ENTER to continue.
With input UHF signals too high the display alert will show the cluster number followed by the symbol
HI
. Press the key ENTER to continue.
Safety Code
To enable or change the safety three digit PIN code go to the
P.000
menu, press the key ENTER
to activate the procedure (flashing display) press the keys UP or DOWN to set the first digit and
confirm pressing ENTER. Follow the same procedure to set the other two digits.
The code
P.000
= PIN code disabled (default setting).