Horizontal System
and
Z-Axis Circuit
Horizontal Magnifiers
and
ReadoutMUX
0
Z-Axis Circuit
3-
16
The
horizontal magnifier consists
of
four stages.
-
The
single ended to paraphase signal splitter, Q601 and Q602.
- The 1x /
5x
magnifier, U601A-B, controlled
by
U606A-B. R620 is
adjusted for the 1x gain, R627 for
the
5x
gain
and
R610 for
an
offset 0
between 1x and 5x gain.
-
The
1x I 10x magnifier, U603
and
U604, controlled by U606C -D. R647
is adjusted for the 10x gain.
-
The
read out multiplexer U602, U601E
and
U604E, controlled by U605.
The
multiplexer switches between
the
analog signal from the
sweep
and the
signal from the D/ A converters on
the
processor board. This
may
be the
horizontal read out signal or the horizontal signal
of
the stored waveform.
When beamfind is selected, U602E is switched
on
and
current for the
horizontal output amplifier is drained
by
U602E, causing
the
output
signal
to clip on a level
within
the
CRT
screen boundaries.
The main power
supply
delivers voltages
to
the
CRT, minus 2 kV for the
cathode, 10
kV
for
the acceleration anode, heater voltage (floating at the
cathode level), 100 V
AC
for the de-restorers
and
an
adjustable focus voltage.
The Z-axis circuit has two analog inputs.
1.
TR_INT for
the
waveform intensity and
2.
RO_INT
for
the readout intensity.
The
waveform intensity is switched
on
and off
by
a combination
of
four
signals:
BLANK,
CHPBLNK, TRBLNK and STORE_XY
_0.
The
MAG10 signal increases the intensity a little
when
the horizontal
magnifier is switched on.
The
readout intensity is switched
on
and
off
by
the
ROBLNK
signal.
EXTZ modulates the waveform intensity.
EXTZ
is enabled
by
a combina-
tion
of
two signals, the EXTZEN_0
and
TRBLNK
signals, so EXTZ only
controls the waveform intensity.
The
complete Z-axis
input
signal
can
be overruled
by
the BFND_0 signal so
the user will have a visible trace or spot anyhow
if
beamfind
is
active.
Theory
of
Operation
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