Tektronix 2221 - Page 40

Controls , Connectors , and Indicators - 2221 Operators
C
SEC / DIV control has the effect of horizontally
compressing (
4 X
SEC / DIV )
the 4K
display
by a
fac
tor of four ( DISPLAY COMPRESS ) . In PEAK
DETECT acquisition mode , peaks are acquired but
not
displayed
when
DISPLAY COMPRESS is
selected .
32
23
TRIGGER
VAR
HOLDOFF
NORM
MAX
บ
STORE
DISPLAY
ROLL ROLL
SCAN
SGL
SWP P - P AUTO ,
NORM
TV
LINE
RESET
TV FIELO -
READY
TRIGʻO
LEVEL
25
24
27
26
20
X10
Magnifier
Switch -
When
the
Variable
SEC / DIV
knob is pulled to the out position ( X10 PULL ) ,
displays
are
magnified
by ten
times .
In
NON - STORE
,
magnification
of the
displays occurs
around
the
center vertical graticule division .
STORE
mode
displays
are
expanded
when the
Variable
SEC / DIV
knob is pulled to the out position ( X10 PULL ) . The
SEC / DIV scale factor readouts are adjusted to
correspond to the correct SEC / DIV of the displayed
waveform ( either NON - STORE or STORE ) . STORE
mode displays are
expanded
around
the
active
CUR
SOR . The display
window for
STORE mode X10
expanded waveforms may be positioned using the
CURSORS Control to view any one - window portion
of the acquisition record .
OFF
29
SLOPE
INV
OUT :
HF
REJECT
ON
EXT
INT
SOURCE COUPLING
CH 1
INT AC
28
30
VERT
MODE
LINE
DC
U
CH 2
EXT
OC
+10
EXT INPUT
1ΜΩ
20pF
<
400V
OK
21 )
STORE
ONLY
Mode
SEC
/
DIV
Multiplier
Functional in the STORE mode only at SEC / DIV
switch settings of 0.1 , 0.2 , and 0.5 s per division .
When
pressed
in , the
Sweep
time
base of
these
three
settings is increased by
a factor of
10 to 1 s
per
division , 2 s
per
division , and
5 s per
division .
Releasing
the
button returns
the
STORE
mode
time
base to X1 . The normal X10 MAG feature is still
functional on waveforms acquired at the slow
STORE mode SEC / DIV
settings
.
31
6530-34
22 Figure 3-4 . Trigger
controls ,
connector , and indicator
.
Horizontal POSITION Control - Positions all the
NON - STORE waveforms horizontally over a one
sweep - length range
( either X1
or X10
Magnified ) .
Using the
Horizontal
POSITION
control ,
STORE
mode
waveforms may be
positioned
over a
range of
one display window . When a STORE mode acquisi
tion display is longer than one screen , the CUR
SORS Position control is used to position the display
window to any position of the acquisition record .
23 ) Mode
Switches - Determine
the
NON - STORE
Sweep triggering mode . STORE mode triggering
operation
depends
on the
position
of the SEC
/ DIV
switch and the trigger mode selected .
TRIGGER
The trigger position is marked by a T on the
acquired waveform . A symbol in the waveform
display
separates the new
acquisition from
the previ
ous acquisition .
See Figure 3-4 for the location of items 23 through 32 .
NOTE
The trigger system controls affect the acquisition of
the next waveform . They are inactive in SAVE
STORE
mode
.
NORM
—
Permits
triggering
at
all
sweep rates ( an
autotrigger is
not
generated in the
absence of an
adequate trigger signal ) . NORM Trigger mode is
especially useful for low - frequency and low
repetition - rate signals .
3-8