AR 10012510, Operating And Service Manual

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Model 200T8G18A/250T8G18
Rev D 13
Menu screens - The screens at the highest level are called menu screens. There are four menu screens. At
power on, the MENU 1 screen is displayed. Each of the menu screens has the soft key S4 labeled MORE. The
MORE key (S4) causes the next menu screen to appear. From MENU 4, MORE causes MENU 1 to reappear.
In short, MORE permits scrolling through the menu screens. The EXIT key returns display to MENU 1 from
any other menu screen.
The menu screens display system status and parameter levels. They are configured as follows:
Menu Functions
Menu 1 Forward power (watts, dBm, or bar graph,)
Reverse power (watts, dBm, or % forward power)
System status (if a latched fault exists, MENU 1 is displayed with the system shutdown message)
Menu 2 Console hours (active when AC power is on)
Operate hours (active when HV is on)
Menu 3 Cabinet temperature (°C or °F)
TWT baseplate temperature (°C or °F)
Menu 4 Heater voltage (Ef)
Heater current (If)
Collector voltage (Eb)
Grid voltage (Eg)
Cathode voltage (Ek)
Helix current (Iw)
Help Screens - On each of the menu screens, soft key S3 is labeled HELP. If S3 is selected, a message
describing the functions of that screen will be displayed. Use the ADJUST knob to scroll through the
message. The EXIT key will return you to the screen from which the help screen was called.
Setup Screens - From MENU 2, S1 (labeled SETUP) selects the first of several setup screens, SETUP 1. This
allows the user to manually shut off the heater power supply and put the HPA into Sleep Mode (see below).
Pressing S1 (SET) toggles between ON and OFF. Pressing MORE again brings up the SETUP 2 screen,
which allows the user to change the Auto Sleep Mode timer setting. Pressing SET will change the timer
options in half hour increments from 0.5 to 3.0 hours. Pressing MORE again will save the timer setting and
bring up the SETUP 3 screen, which toggles the display of temperature parameters between Fahrenheit and
Celsius degrees. Pressing S1 (SET) changes the selection. The setting displayed when the screen is exited will
be retained. Pressing MORE again brings up the SETUP 4 screen, which allows a choice of displaying
forward power in strip chart form, or in dBm or watts. Pressing MORE a third time brings up SETUP 5,
which allows a choice of dBm, watts, or % of forward power for displaying reverse power. MORE brings up
SETUP 6, which allows entering the desired number of alarm beeps and the desired beep volume. S1 (SET)
toggles between parameters, and the adjust knob is used to enter the data. Setup 7 allows the IEEE-488
address to be set. Setup 8 allows selecting between pulsed or CW operation. The SET button toggles between
the two. MORE returns you to SETUP 1. EXIT returns you from any of the setup screens to MENU 2.
Sleep Mode - The Sleep Mode feature allows the user to selectively shut off the heater module of the power
supplies. This can be done manually through the front panel or remotely via the computer interface. This is
typically used during extended periods of
remote operation to improve tube life, by turning off the filaments
(Sleep Mode activated). This eliminates excessive STANDBY hours on the TWTs while still permitting
remote capability to turn on the amplifier.