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34
3.3.1.3.
Horizontal section
AC, DC, DTB, MTB, AC, DC,
SINGLE, RESET, ALT TB, AUTO
AC depressed
DC depressed
DTB depressed
MTB depressed
SINGLE depressed
RESET depressed
ALT TB selected
AUTO selected
X POS/X MAGN
HOLD OFF
TRACE SEP.
3.3.1.4.
Main time-base generator
LEVEL/SLOPE
DUAL
TIME/DIV
CAL (TIME/D!V)
A, B, EXT, EXT=10, COMP,
LINE
A depressed
B depressed
EXT
Horizontal display-mode or deflection switches, and trigger mode switches.
Trigger coupling via a d.c. blocking capacitor.
Trigger signals are direct-coupled.
The horizontal deflection is determined by the delayed time-base
generator.
The horizontal deflection is determined by the main time-base generator.
The time-base generator runs only once after the receipt of a trigger pulse.
Enables the SINGLE action again.
DTB and MTB depressed simultaneously.
The horizontal deflection is switched between the MTB and the DTB at
the end of each time-base sweep.
When the DTB TIME/DIV switch is in the OFF position, only the MTB
signal is displayed.
AC and DC depressed simultaneously.
The MTB is free-running in the absence of trigger signals.
Continuously-variable control of horizontal shift of the display,
incorporating a push-pull switch for increasing the sweep speed by a factor
of 10 (PULL FOR x10).
Continuously-variable control for selecting the sweep hold-off tirne.
Continuously-variable preset control of the vertical separation between the
MTB and DTB traces in the ALT TB mode.
Continuously-vartable control for selecting the trigger level on the input
signal at which the time-base starts. This control incorporates a push-pull
switch that enables choice of triggering either on the positive or negative-
going edge of the input signal.
In this position of the LEVEL control, the oscilloscope is able to trigger
on either positive or negative-going edges of the input signal.
Time coefficient control of the MTB, ranging from 0,1 ps/DIV to
0.5.s/DIV in a 1-2-5 sequence.
(X-DEFL. switch integrated)
Continuously-variable control of the MTB coefficients.
The selected time coefficient is calibrated in the CAL position.
Trigger source or external X DEFlection selector.
Internal trigger or
X DEFlection signal derived from channel A.
Internal trigger or
X DEFlection signal derived from channel B.
Triggering from an external signal connected to the adjacent 1 M&Q2//
20 pF BNC socket.
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