Tektronix 2221 User Manual

บ
Controls , Connectors , and Indicators - 2221 Operators
CRT READOUT
Signal
Ground
and Shield
Ground
are
also
pro
vided for grounding between the 2221 and the
external X - Y Plotter . Waveforms and the Readout
are
plotted on the crt
while a plot is
in
progress .
41
To be fully
compatible
, the X - Y
Plotter used
must
have both pen - lift control and X and Y inputs with
sensitivity
control .
The Readout System provides an alphanumeric display
of information on the crt along with the waveform displays .
The readout is displayed in three rows of characters . Two
rows are within the top graticule division , and the other
row is within the bottom graticule division . The locations
and types of information displayed under normal operating
modes are
illustrated
in Figure
3-9 . u
Signals available at the AUXILIARY connector
allow the Pen Lift circuit to be wired for
plotter
with either
active Hi
or active LO
drive
require
ments and
several logic
families .
Examples for
both an active HI and an active LO TTL drive are
shown in Figure 3-8 .
in NON - STORE mode , the current setting of the
VOLTS / DIV
and SEC / DIV
switches
are
displayed
.
Greater - than symbols ( > ) are used to indicate uncalibrated
VOLTS / DIV and
SEC / DIV
switch settings . A
down - arrow
symbol ( 1 ) is used in front of the CH 2 VOLTS / DIV readout
to indicate CH 2 INVERT . The AC - GND - DC input coupling
selection is indicated in the associated VOLTS / DIV
readout with a tilde symbol ( ~ ) above the volts symbol for
AC , a ground symbol ( ro ) for GND , and no extra symbol
for
DC
input
coupling .
u
EXT CLK
INPUT
-
Provides
an
input for
EXT
CLOCK
signals
to the
storage
acquisition
circuit
in conjunction with the EXT CLK position of the
SEC / DIV
switch
.
Samples
are
referenced by
falling edges . Input is TTL compatible . Samples
become visible by pairs , as SCAN or ROLL .
Several
clocks are
required
before the
point
asso
ciated with the
first clock is
visible .
STORE
Mode
In STORE mode , many of the crt readout displays are
associated with the parameters of stored waveforms .
بال
41
AUXILIARY CONNECTOR
RELAY N.O.
AELAY COMM
+ 4.2
VOC
SIG GNO
PARAMETER
READOUT
.
Displays
the VOLTS
/ DIV and
SEC / DIV settings of the displayed waveforms on which
the cursors are placed . The AC - GND - DC input coupling
selection is indicated in the associated VOLTS / DIV
readout with a
tilde symbol ( ~ )
above the volts
symbol for
AC , a ground symbol ( ro ) for GND , and no extra symbol
for DC input coupling . If the VOLTS / DIV switch is switched
beyond the available expansion or compression range , the
readout is tilted , indicating that the VOLTS / DIV switch set
ting and
the
VOLTS / DIV
readout
no
longer
agree
. In
4K
COMPRESS , a c is displayed in front of the SEC / DIV
readout .
EXT CLK
RELAY
N.C.
X
SHIELD
GNO
CAUTION
< 25Vpk AND < 100mA ABS . MAX
APPLIED TO ANY CONNECTOR
CURSOR
READOUT
.
Displays
the
voltage
difference
( either AV 1 or AV 2 ) and the time difference between cur
sors . Independent fields for CH 1 VOLTS / DIV , CH 2
VOLTS
/ DIV ,
and SEC /
DIV are
provided
.
When
making
ground - referenced voltage measurements ( ground dot
displayed and cursor on ground dot ) the A symbol is
replaced
by a
ground
symbol
( ro ) .
( 4998-10 ) 5301-21
Figure 3-7 . Left Side Panel .
A bar graph is used to indicate the position of the
display window within the acquisition record .
3-14
u

Tektronix 2221 Specifications

General

Brand	Tektronix
Model	2221
Category	Test Equipment
Language	English