Philips PM3320 Operating Manual page 141

4.4.5
4.4.6
4-125E
Z-conitrol
The Z.trace bianking/unblanking signal for the C.R.T. depends on a number of factors, like
register selection, A versus B or X=t display, dot join, text and so on.
The Z-AMPLIFIER is therefore controlled by the microprocessor, a control signal from the
vertical and horizontal signal path, the frontpanel NTENSity controls and the frontpanel FOCUS
control.
Plot
Signals PLOT X, PLOT Y and PLOT Zare applied to the ANALOG PLOT OUTPUT circuit and from
there to the PLOT OUTPUT socket on the rear panel.
Via the SAVE/PLOT menua "register plot" function can be selected and via the DISPLAY menua
"screen plot" function can be selected.
Cal
A CAL GENERATOR generates a 1 Vpp - 2 kHz signal for calibration purposes.
The control section
The control signals which are routed to the various circuits are indicated with "C ——>" for the
MANAGEMENT INTERFACE and with "CuP -->" for the MICROPROCESSOR.
A MICROPROCESSOR system including a ROM MEMORY for the system program and a RAM
MEMORY for the variable data is controlling the instrument.
The following functions are under its control:
- Watching the frontpanel rotary switches
- Reading the actual front panel keys and softkeys and displaying the actual softkey
functions on the C.R.T. screen
- Setting of the acquisition circuits via the MICROPROCESSORMANAGEMENT INTER-
FACE
- Performance of calculations
- Control of frontpane! pilot lamp
- CRT display control for traces as well as for text
- Plot output control.
— Performance of the AUTO-SET function (with pushbutton AUTO)
~ Programming of the front settings (with pushbutton FRONT No)
Microprocessor management interface
All the frontpanel controls, except the CRT CONTROLS, ILLUM, INTENS, INTENS TEXT, TRACE
ROT and the POWER ON switch, are activating the various circuits via the microprocessor
control circuits and the MICROPROCESSOR MANAGEMENT INTERFACE.
In this MANAGEMENT INTERFACE aiso various control signals for the signal acquisition are
generated under command of the microprocessor.
Options
The pilot !amp REMOTE as well as the pushbutton URQ can be used when an option is installed.
The front section
All the frontpanel rotary switches, pushbuttons, numerical keyboardand softkeys inform the
MIGROPROCGESSOR system about the user's settings via the FRONT CIRCUIT. The MICRO-
PROCESSOR controls the frontpanel pilot lamps via this FRONT CIRCUIT.