System Description Chapter 2

10-kW UHF Transmitter with Chapter 2, System Description
Feedforward Driver
840A, Rev. 0 2-8
2.2.4 10-kW Amplifier Assembly Metering Control Panel
Table 2-10. 10-kW Amplifier Assembly Meters
METER FUNCTION
Reads DC voltage (a full-scale reading is 1 volt)
Note: A multiplier,
whose value is dependent on which position switch S1 is in,
must be applied. The multiplier that is needed is marked in
parentheses near the switch.
With Switch S1 in
Position
Display
Switch (S1) Voltage Meter
Selects the desired plate voltage,
screen voltage, bias voltage, and
filament voltage readings
Plate (x10 k) Reads the plate voltage (typical
reading is 5200 volts)
Screen (x1 k)
Reads the screen voltage (typical
reading is 500 volts)
Bias (x1 k)
Reads the bias voltage (typical
reading is 85 volts)
Voltage Meter
(M1)
Filament (x10)
Reads the filament voltage (typical
reading is 5.2 volts; black heat
voltage is 1.5 volts)
Reads DC current (a full-scale reading is 50 mA)
Note: A
multiplier, whose value is dependent on which position
switch S2 is in, must be applied. The multiplier that is needed
is marked in parentheses near the switch.
With Switch S2 in
Position
Display
Switch (S2), Current
Meter
Selects the desired plate current,
screen current, and control grid
current readings
Plate (x100)
Reads the plate current (a
typical reading is 1.5 amps, no
RF drive, to 4 amps; 100%
power, sync-only)
Screen (x2)
Reads the screen current (typical
reading is <60 mA)
Current Meter
(M2)
Control Grid (x1)
Reads the control grid current
(typical reading is 0 mA to 5 mA)
Note: The meter reverse
switch (S3) must be switched
down to give an upscale
reading.