Reading The Meters; Front Panel Switches & Controls - QRO Technologies HF-2500DX Instruction Manual

fan will cool the tubes before you turn the Amplifier off.
R
efer to Front Panel Pictorial while you read the following information:
Multimeter: The Multimeter switch on the front panel of the amplifier directly below the two panel
meters selects the right-hand meter functions. Read the meter scale which corresponds to the
setting of the Multimeter switch as shown in Table A.
Multimeter Switch
Position
Plate Voltage (PV)
Screen Voltage (SV)
Plate Current (IP)
Screen Grid Meter: The left-hand meter always indicates screen grid current between 0 and 150
milliamperes. Each Division indicates 5 milliamperes.
On/Off Switch: Rocker type switch which turn the amplifier on or off
Operate/Standby Switch: Rocker type switch used to place the amplifier in a transmit mode
Fan High/Low Switch: Rocker type switch which control blower speed
ALC Control: Varies the negative feedback voltage to your transceiver. A clockwise rotation
increases this voltage which reduces the drive power delivered to the amplifier from the
transceiver. The ALC line between the transceiver and the amplifier must be properly connected
for this feature to operate.

READING THE METERS

Measures
Plate Voltage
Screen Voltage
Plate Current
FRONT PANEL SWITCHES & CONTROLS
Table A
Bottom scale indicates 0 to 3.5 KV
(normal operating range is 2.4 KV to 2.6
KV volts) Each division represents .1 KV
(100 volts).
Bottom scale indicates 0 to 3.5 KV
(normal operating range is .35KV (350
volts) Each division represents .1 KV (100
volts).
Top meter scale indicates 0 to 2.8
amperes. Each division represents .8
amperes (800 milliamperes).
Scale Indication
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