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3-16E
3.3.4
3.3.5
CRT Display
The trace intensity on the c.r.t. is controlled by the
Z AMPLIFIER.
The Z AMPLIFIER blanks the flyback on the trace and also the switching intervals between the traces. For
the vertical switching modes, ALT and CHOP, the Z AMPLIFIER is driven by a Z-blanking signal from the
VERTICAL CHANNEL SELECTION
(CHOP) or the HORIZONTAL SELECTION
(ALT).
External trace blanking is obtained via an applied signal to the
Z MOD BNC-input.
The FOCUS control drives the focus electrodes of the c.r.t. via the FOCUS control unit, to give trace
sharpness.
,
Trace alignment is achieved by the TRACE
ROT control, which drives the trace rotation coil.
The 1LLUM control provides illumination of the graticule by means of two lamps.
Power supply
The oscilloscope may be powered by any a.c. voltage between 90 V and 264 V.
When switched off, the LINE ON switch interrupts the primary circuit.
This switch is the only front panel pushbutton that is not controlled by the microcomputer.
After rectification, the relevant d.c. supply voltages feed the various circuits in the instrument.
When the instrument is operating from an a.c. mains voltage, a related signal at mains frequency is fed to
the MTB TRIGGER SELECTION for LINE triggering.
The EHT CONVERTER
produces 14,5 kV via the HT (High Tension) MULTIPLIER for the accelerator anode
of the c.r.t. and —2,1 kV for the FOCUS CONTROL.
The calibration square-wave signal is generated in the CALIBRATION GENERATOR
and fed to the CAL
socket.
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