A Versus B Mode; Analog Plot-Mode - Philips PM3320 Operating Manual

4-110E
4.3.15
4.3.16
A versus B-mode
With a A versus. B selected, XY display is.obtained from the samples derived from the channel A
and channel B inputs.
The samples derived from the channel A input signa! are used for horizontal deflecton and the
samptes derived from the channel B input for vertical deflection.
This A versus B mode is principally a different mode than the real time X-Y mode in a real time
oscilloscope,
In this case it is only a different way of displaying the contents of the registers. The storage of
signal information is influenced by the position of the TIME/DIV switch, trigger selection and
trigger SLOPE and LEVEL, so the A versus B display of this information is also influenced by
these factors.
Analog plot mode
Two different PLOT-modes can be selected:
~ Register PLOT via the SAVE/PLOT menu:
The contents of the selected register can be plotted. The Y-POSITION, the X-POSITION, and
the X-EXPAND controls and the MAGNIFY selection have no influence.
- Screen PLOT via the DISPLAY menu:
The picture on the trace area of the C.R.T. screen can be plotted including the influence of the
Y¥-POSITION, the X-POSITION and the X-EXPAND controls and the MAGNIFY selections.
The picture will be similar to the picture on the screen.
The X and Y plot outputs on the rear panel of the oscilloscope generate 1 V full memory or 1 V full
screen. (See characteristics),
The PEN LIFT output is an open collector output; max 12 V (TTL compatible).
Via the SAVE/PLOT menu the following selections can be done.
- PEN UP "oO"
- PEN UP "1"
- PLOT speed
Range: 20 ms/dot ... 2000 ms/dot.
- Register RO, R1, R2 or R3 {only for register PLOT).
During plotting, the oscilloscope is in the LOCK-mode, which means that the contents of all
registers cannot be changed.
In case of dual channel! plotting, first channel A will be plotted and then channel B.
The PLOT operation is provided with a short delay at the start and end of the action to give
sufficient time for manual pen positioning if no automatic pen lift function is available on the
recorder.
lf the SINGLE-shot mode and register plot is selected, the AUTOPLOT function can be activated,
The contents of register RO is then automatically plotted after each refreshment of the register
when a valid trigger is received.
The progress of the piotting is indicated by a dot on the C.R.T. screen, which moves from the leftto
the right and which is displayed in the bottom text area.