R.V.R. Elettronica VJ2000, Руководство пользователя

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VJ2000
26 / 44 USER MANUAL Rev. 4.0 - 26/02/01
8) Connect the line supply (220V ±5%) to the unit.
9) Switch the POWER switch to ON, the corresponding indicator will show the presence of
the line supply in the unit and, at the same time the cooling fan will start.
Normally the PRESS. indicator will stay on for a few seconds before the fan has created
sufficient air flow.
After 2-3 minutes of warming up, the HT indicator will light up; simultaneously the
characteristic noise of the power solenoid will be heard indicating that the anode supply
is active.
The driver will also be active.
The unit without excitation will absorb about 200 mA of anode current.
10) Switch the OUTPUT POWER switch to DIR and the CURRENTS switch to PLATE.
11) Adjust the exciter power control to obtain a anode current of 350/400 mA.
12) Using the TUNING switch, activate the tuning motors so that both green leds next to the
PLATE control light up.
Holding the TUNING switch down, use the PLATE "+" or "-" control (the unit is factory-
set to a frequency of 98 MHz) to tune the anode circuit.
"+" indicates an increase in frequency, and "-" a reduction in frequency.
If one of the leds switches off, this indicates that the end of the frequency range has
been reached and that no more adjustment is available in that direction.
The OUTPUT POWER meter can be used to tune the anode circuit; maximum meter
reading (maximum output power) corresponding to correct tuning.
13) The LOAD tuning procedure follows in a similar fashion: holding down the TUNING
switch, adjust the LOAD control for maximum output power.
REPEAT STEPS 12 AND 13 SEVERAL TIMES TO OBTAIN THE OPTIMUM SETTINGS
14) Increase exciter power until an output power of 2000W is obtained and repeat steps 12
and 13.
Note: The driver power don't never must excess 60W, then the maximum Plate current is
900mA and the maximum Grig current is 60mA max
15) With output power at 2000 W, make small adjustments, as above, to minimize grid and
anode currents; if necessary, reduce exciter power to maintain 2000 W of output power.