Tektronix 7834

Operating Ins#ructions--7834
SAVE mode is activated . When in the SAVE
mode, the
time-base
unit(s) and readout system
are inhibited and
the display cannot be erased . The
SAVE INTENSITY
control adjusts the intensity of
the saved display . Minimum
intensity provides the greatest
viewing time in the VAR
PERSIST and FAST VAR PERSIST
modes
;
and although
the
view time of the BISTABLE and FAST
BISTABLE
storage
modes is very long without the use
of the SAVE
mode, the SAVE mode simplifies photography
by allowing
the
operator to control the stored display's
intensity .
The SAVE mode
can be selected with or without a stored
display present
. If it is selected after an erase
cycle and
before a
sweep has occurred (no stored
display), then the
display waits in the STORE mode
until a sweep occurs, at
which time the display automatically
enters the SAVE
mode . (This is referred to as
the Auto Save mode .)
Care of Storage Screen
The following precautions
will prolong the useful storage
life of the crt

used in this instrument :
1 . Use
minimum beam intensity to
produce a clear, well-
defined display .
2 . Use
minimum SAVE INTENSITY
when storing images
for
extended periods of time .
3 . Avoid
repeated use of the same area of the
screen . If a
particular
display is to be stored repeatedly,
change the
vertical position
occasionally to use other portions of
the
display area .
Vertical
and Horizontal Mode Combinations
There are 20 possible combinations of
VERTICAL MODE
and HORIZONTAL MODE
switch settings . The total
possible number of display
combinations is further multi-
plied by the variety of plug-in
units available for use with
this instrument,
the interchangeability of plug-ins
(i
.e .,
either an
amplifier or a time-base unit can be installed
in
any compartment), and by the capabilities of
the plug-in
units which are used in the instrument (e
.g ., a dual-trace
amplifier unit can be used in either of
the two single-
channel modes, in the dual-trace
mode or added-algebra-
ically mode ; a delaying
time base may be used either for a
sweep or for
delayed sweep) . Therefore, it is difficult to
list
all of the
display combinations which can occur during use
of the 7834 and
available plug-in units . Table 2-1 lists the
combination of
VERTICAL MODE and HORIZONTAL
MODE
switch positions available and the type of display
obtained with each combination .
Vertical
Mode --
LEFT
ALT
ADD
CHOP
RIGHT
Horizontal
TABLE 2-1
Display
Combinations'
Mode
Comments
A or B

One trace
. Vertical deflection from
single unit ; horizontal deflection
from single unit .
ALT or

I Two traces
. Vertical deflection
CHOP

from single unit ; horizontal deflec-
tion from both units .
A or B

Two traces . Vertical
deflection
from both
units ; horizontal deflec-
tion
from single unit .
ALT or

Two
traces . Vertical deflection
CHOP

from both units ; horizontal deflect-
tion from both units . Independent-
pairs (sweep slaving) operation,
see
Alternate Mode discussion
in this
section .
A or B

One trace . Vertical
deflection
shows algebraic summation
of sig-
nals from both units ;
horizontal
deflection from
single unit .
ALT or

Two traces .
Vertical deflection
CHOP

shows algebraic
summation of sig-
nals from both units ; horizontal
deflection from both
horizontal
compartments .
A
or
B

Two traces . Vertical deflection
shows signals from both units ;
horizontal deflection from
single
unit .
ALT or

Four traces . Vertical
deflection
CHOP

shows signals
from both units ;
horizontal
deflection from both
units .
A or B

One trace . Vertical deflection
shows signal from
single unit ; hori-
zontal deflection from
single unit .
ALT or
CHOP
Two traces .
Vertical deflection
shows signal
from single unit ; hori-
zontal deflection from both units .
' Combinations given for
single-channel vertical and horizontal units
only .