Main Time Base Generator - Philips PM 3214 Anleitung

18
TIME/DIV (outer switch)
TIME/DIV (inner knob)
X POS/X MAGN
TRACE SEP.
2.2.4
Main time base generator
LEVEL
SLOPE (IN +,OUT—)
Trigger mode switch
AC —AUTO — DC
L TVL~~TVF--~
AUTO
AC
DC
AC
AUTO
LTVL-~
AUTO DC
~- TV F—I
Continuously variable control giving horizontal shift of the display;
incorporates apush-pull switch, PULL FOR x 10, which increases
the horizontal deflection coefficient by a factor of 10. The
magnifier is also operative if an external X deflection signal is used.
Continuously variable control of the vertical space between the two
time-base displays in the ALT.TB mode.
Continuously variable control to select the level of the triggering
signal at which the timebase generator starts.
This control incorporates apush-pull switch, which enables choice
of triggering on the positive or negative~oing edge of the triggering
signal. For TV triggering, select —for negative video signals and
+for positive video signals.
Function
3-way pushbutton switch selecting the trigger mode.
With all pushbuttons released AUTO sweep mode is in operation at
a fixed range of the LEVEL control.
A trace is displayed in the absence of trigger signals. The range of the
LEVEL control is proportional to the peak-to-peak value of the
triggering signal.
Normal triggering and fixed range of the LEVEL control. The DC
component of the trigger signal is blocked.
Normal triggering and fixed range of the LEVEL control. The DC
component of the trigger signal is passed.
Line synchronisation is obtained.
Frame synchronisation is obtained.
Trigger source switch Function
A —
B —EXT —LINE 4-way pushbutton switch selects the trigger source, (or the source
L COMP —I
of horizontal deflection if X deflection source switch is depressed
for X DEFL).
With all pushbuttons released, the effect is the same as the A
button depressed.
A
Signal derived from channel A
B
Signal derived from channel B
A
6 Composite signal, derived after the electronic switch. Triggering
~—COMPS occurs on the displayed waveforms (not usable with X DEFL).
EXT
External signal derived via the adjacent 1 MS2//20pF socket.
LINE (MAINS)
Signal derived from the line (mains) voltage. (Inoperable when
instrument is battery-powered►.
Selects the time coefficient from .2 µs/d iv to .5 s/div in a 1-2-5
sequence.
Continuously variable control of the time coefficients. Must be
switched to CAL position (i.e. fully clockwise) for the time axis to
be calibrated according to the indication of the TIME/DIV switch..
1 MS2 — 20 pF BNC socket for external triggering or horizontal deflection.