Tektronix 2221 User Manual

П
Basic
Applications
-
2221
Operators
b . Set the AC - GND - DC switch to DC .
7. Push
the
SELECT C1 / C2
button
to
select the other
cursor . The nonmoving cursor is now the O - volt reference
for making measurements on the waveform .
C.
If the
waveform
moves above the
center line of
the crt , the voltage is positive . If the waveform
moves below
the center line
of the crt , the
volt
age is
negative
.
8. Use
the
CURSORS
control
to
move
the
active cur
sor to the
point of
interest
on the
waveform
( see
Figure
6-13 ) .
9. Read
the dc
voltage
from
the
readout .
3. Set
the AC -
GND - DC
switch
to
GND and
the
STORE /
NON
-
STORE
switch to
STORE
mode
(
button
in )
.
If the
channel
signal is
being
used as the
internal
trigger
source , ensure that the TRIGGER Mode switch is set to
P - P
AUTO
.
V1 =
6.01
Vi
AT =
5.98msi
100
90
ACTIVE
CURSOR
4. Use the
appropriate channel Vertical
POSITION con
trol to
move
the
baseline
trace
to a
convenient
reference
line . For
example
, if
the
voltage to be
measured
is
positive
,
position the
baseline
trace to the
bottom
graticule line ; if
the voltage is negative , position the baseline trace to the
top
graticule line ; and
if the
voltage is an
alternating
sig
nal ,
position the
baseline
trace to the
center
graticule line .
DC
VOLTAGE
AMPLITUDE
10
GROUND
REFERENCE DOT
NOTE
2V
2ms
CURSOR AT
GROUND
REFERENCE
If the
ground
reference
is
set more
than 75
divi
sions
from the
center
horizontal
graticule
line
,
the
ground reference will not be stored . When using
ADD
VERTICAL
MODE ,
both
channel
input
coupling
switches
must be
in
GND to
store
a
ground
refer
ence .
( 4998-15 ) 6530-40
Figure
6-13
.
Ground
referenced de
voltage ,
cursor
method
.
П
П
П
П
П
Л
П
in
П
1
7
1
7
П
П
П
П
5. Set
the
selected
channel AC -
GND
- DC
switch to DC .
An
intensified
ground
reference dot is
visible
at
the left
edge ( the
first
sample
location of the
waveform
display
) of
the
crt
graticule
.
TIME
DURATION
1.
Preset
instrument
controls and
obtain a
baseline
trace .
NOTE
2. Set
the
STORE /
NON -
STORE
switch to the
STORE
position
(
button in ) .
If the
vertical
position
of
the
display
is
moved
after
the
ground
reference is
stored , the
displayed
ground
reference is no
longer
a
valid
reference
.
Also ,
the
accuracy of the ground reference is affected by do
offsets due
to
thermal
drift and
balance ( DC
and
INVERT
)
adjustments
.
Additionally
, if
the AC -
GND
DC
switch is
set
to
AC ,
the location
of
the
ground
reference
indicates the
average
value
of
the ac
com
ponent
of
a
waveform ,
3.
Select a
VOLTS /
DIV
switch
setting
that
gives
the
desired
vertical
deflection
.
4.
Set
the
SEC /
DIV
switch
to
display
one
complete
period of the
waveform to be
measured ( see
Figure 6-14 ) .
6. Use
the
CURSORS
control to
move
the
active
cur
sor to
the
ground
reference
point .
5. If necessary , use the AT / 1 / AT button to set the time
measurement
mode to
DELTA
TIME ( at
power - up ,
the
default is
DELTA TIME )
.
6-15

Tektronix 2221 Specifications

General

Brand	Tektronix
Model	2221
Category	Test Equipment
Language	English