Specifications

6
DOCNUMBER 9500
Document Issue 1, Revision 7
June 2009 Page 6–3
Alpha Radio Products Alpha 9500 HF Linear Amplifier Operating Manual
Product Release 1 Operating the Amplifier
At maximum output and efficiency, the red grid LEDs should not be
illuminated. If they are illuminated before the desired value of plate
current and/or power output is reached, readjust amplifier loading before
continuing.
Step 7 Ensure that exhaust air is detectable from the exit vent holes above the
tube. If exhaust air is not detectable:
7a TURN OFF the amplifier immediately.
7b Ensure that the exhaust chimney is properly positioned over the tube.
7c Power up the amplifier again.
NOTE If the amplifier faults, it usually resets itself after 4 seconds.
•
To reset the amplifier manually if it fails to reset itself, push ON/
AMP and then OPR. (You need not turn the amplifier off.)
•
To display the last fault, press the FLT button and view the 7-
segment display.
•
To display the last 15 faults, open the AR9500 PC application that
allows remote control over a serial interface and select the
correct COM port. Select Tools > Get fault log.
To see a complete list of possible faults, see Chapter 9, “Diagnosing
Faults.”
6.2 (Optional) Set Up to Operate from a PC
You can optionally control the ALPHA 9500 completely from the
Microsoft
®
Windows
®
AR9500 PC application rather than from the front
panel.
For more information, see Chapter 7, “Operating the Amplifier from a PC
Interface.”
6.3 Put the Amplifier into the Desired State
The ALPHA 9500 can be in one of seven states at any instant. These are
shown in
Table 6-1 and described below.
Table 6-1 Amplifier states
State Amplifier Status
0 OFF: Amplifier plugged in but OFF