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Depending on the DTB trigger source switch selection, the DTB starts immediately
receipt of the trigger pulse derived from the TRIGGER AMPLIFIER
Each time-base produces a time-linear sawtooth voltage, the sweep time of which can be selected with the
TIME/DIV
switch.
The HORIZONTAL
AMPLIFIER.
The signals available for selection are: MTB, DTB, ALT. TB or X DEFL.
To prevent trace overlap in the ALT. TB mode, the TRACE SEP control permits vertical shift between the
MTB and DTB displays.
Horizontal shift of the time-base line is achieved with the X POS control and it can be magnified by a factor
of 10 using the PULL FOR IOX switch part of this control.
The FINAL HORIZONTAL AMPLIFIER drives the horizontal deflection (X) plates of the c.r.t.
1.5.3.
CRT display section
Trace intensity is controlled by the Z AMPLIFIER
The Z AMPLIFIER blanks the flyback of the trace and also the switching intervals between traces in the
CHOP
and ALT
modes.
For CHOP mode, the blanking signal is derived from the vertical CHANNEL
ZONTAL
SELECTION
The ALT
mode blanking
For the intensified portion of the delayed time-base on the main time-base waveform, a signal is produced
in the DTB, which is fed to the Z AMPLIFIER.
The FOCUS control drives the focussing electrode of the c.r.t. to regulate the sharpness of the trace.
The trace should lie parallel with the horizontal graticule lines. Any deviation can be corrected with the
TRACE ROTATION
1.5.4.
Power supply
The PM3267 oscilloscope may be powered by an a.c. line voltage (1 IOV, 220V, 240V) or a 20 ... 32V
battery supply.
For safety, the oscilloscope is provided with a double-insulated
After rectification, the stabilized d.c. voltages are fed to the various electronic circuits in the instrument.
When the instrument is operating from an a.c. line (mains) voltage, a line frequency-related signal is fed to the
TRIGGER
SELECTION
The extra-high tension supplies for the c.r.t. are produced in the 1500 V CONVERTER and the H.V.
MULTIPLIER
(8,5 kV).
SELECTION
circuits determine which signal is routed to the FINAL
circuit.
signal is produced
in the HORIZONTAL
potentiometer.
of the MTB for LINE triggering.
(A or B selected).
and adjusted by the INTENS control.
SELECTION
SELECTION
line transformer.
19
(MTB selected) or upon
HORIZONTAL
and the HORI-
circuit.
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