NARDA PMM 6000N User Manual - 3 - Operating Instruction
Operating Instruction
3-1
3 - Operating Instruction
3.1 Cooling
It is necessary to ensure that the PMM 6000N forced-air cooling system be
allowed to operate at maximum efficiency. Cooling depends upon the free
flow of cooling air through the bottom and the rear of the unit. Take care to
keep these areas free of any objects that could obstruct this free air flow.
3.2 Safety Precautions
Input power to the unit should not exceed 0 dBm (1 mW). Although the
system has no provisions designed for output VSWR protection, MOS-
FET's amplifier technology exhibits itself high tolerance to load mismatches
To avoid any damage of the amplifier:
1. Don’t exceed a drive level of 0 dBm (1mW) for 10 W output.
2. Ensure a 50 Ohm load is connected to the Amplifier output before
operation.
3. Ensure the vent grid be free to allow a correct Amplifier
ventilation.
3.3 Connection to Power
Source
PMM 6000N operates from 85 to 264 VAC thanks to its internal switching
power supply. The AC Voltage input selection is thus not required. The unit
is connected to the AC power outlet with line cord supplied.
3.4 Front Panel
indicators
PMM 6000N amplifier has no critical adjustment.
Power Indicator: Lights when the amplifier is switched on;
Flashing when internal protection is active (current limiter)
Alarm Indicator: Lights when internal temperature exceeds 60° C;
Panel Meter Indicator: Indicates power output Watts into 50 Ohm load.
3.5 Placing Equipment In
Service
It is a good practice to follow the procedure below for placing the amplifier
in service:
- Connect the load to the PMM 6000N Amplifier “OUTPUT” by a N
connector and coaxial cable of 50 Ohm impedance.
To avoid any RF interference, it is suggested to use only proper shielded
cable and high quality RF connectors.
- Without signal applied to the input, switch the POWER switch on the rear
panel to the ON position. The power light indicator will come on and fans
will start. Watch the power meter and increase the signal source until a
meter reading is observed. If your load is a 50 Ohm load, you can read the
output power directly on the meter scale.
The unit is protected against over-temperature by temperature sensing
switch in the supply section of the amplifier module. In case of such a
condition the alarm indicator on the front panel will come on for the
duration of the over temperature condition.
- The PMM 3000 or other RF Signal Generator driving the PMM 6000N
linear Amplifier should be connected to the BNC “INPUT” connector at the
front panel using a 50 Ohm coaxial cable.
The nominal drive level to achieve the maximum output power is 0 dBm
corresponding to 1mW into 50 Ohm.
Document 6000NEN-90404 -
© NARDA 2007