Tektronix T921 User Manual

Only the control settings that affect the check being
\ performed are given . Do not move the control settings
unless
instructed to do so . Start at the beginning and
follow the sequence of steps through
to
the
end .
If
you skip
a step or start in the middle of a check, you won't be able to
tell
whether a partiular function is operational . If you have
a T921, use the control
settings for Channel 1 only
.
First, check that the Power Input Voltage Selector
switch and the HI-LO Range Selector switch on the
bottom of the cabinet (T921/T922 only) are set for your
power input voltage . In the United States the Power Input
Voltage Selector switch is normally set for 120 V and the
HI-LO Range
Selector switch is normally set for HI at the
factory . In Europe the Power Input
Voltage Selector
switch is normally set for 240 V and the HI-LO Range
Selector is normally set for LO .
Your instrument may be damaged if it is operated
from a
240 V power input voltage
source
with the
power input voltage selector switch set for 120 V .
Only qualified service personnelshould change the
power input voltage selector switch to a different
range .
REV
. A, JUNE 1976
WARNING
To
avoid electric shock, refer T922R input voltage
and range changes to qualified service personnel
.
See the Service Information section of this manual
for range change instructions .
For the T922R, the input
voltage selection and range
selection controls are internally accessible only .
Before
connecting your instrument to the power source, check
AC RMS RANGE indicator on the instrument rear panel .
When
the
instrument leaves the factory, this indicator is
set to indicate the voltage range from which
the instru-
ment is set to operate .
The
POWER indicator lamp will blink when the applied
power input voltage
varies more than about 10% (either
high or low) from the value selected
by
the
120 V/240 V
and HI/LO selector switches .
If the
120 V/240 V and H I/LO switches are properly set,
`~ connect the power
cord plug to the power source and turn
the instrument on . Set the trigger MODE
to AUTO,
and
SOURCE to INT .
Operating Instructions-T921/T922/T922R
You should get a trace on the crt screen
. If
you
don't,
push the BEAM FINDER button and hold it
in while
increasing
the INTENSITY (clockwise) . A trace, or one or
two bright dots, indicates that the instrument is operating .
You may also have to adjust the FOCUS and POSITION
controls .
Vertical Positioning and Horizontal Operation
1 . Set :

LEVEL

mid-range
SEC/DIV

1
ms
X1 - X10

X1 (fully ccw
detent)
vertical mode

CH 1
2 . Check that
the CH 1 POSITION control
moves the
trace off
the
top
and bottom of the screen
. Leave the trace
between oneandtwo divisions above
the center line . If the
trace does not extend across
the screen, move the
horizontal POSITION control
until it does .
3 . Set
the vertical mode switch
for
CH
2 . Check that
the CH
2 POSITION control moves
the trace off the top
and
bottom of the screen . Leave
the trace between one
and two divisions below the
center line .
4 . Set the
vertical mode switch for DUAL
TRACE . You
should have two traces
on the crt screen-one
above the
center line and
one below .
5 . Check that there are
two traces at every setting of
the SEC/DIV switch from
.2 ps to .5 s .
6 . Set the SEC/DIV switch
to 1 ms and the vertical
mode switch to CH 1 .
FOCUS and INTENSITY Operation
Adjust the FOCUS and the INTENSITY controls
for
a
fine line at a comfortable brightness level .
Trace Rotation and Vertical Input
Operation
Most of the remaining checks require applying the
PROBE ADJ signal to the inputs .
2- 11

Tektronix T921 Specifications

General

Brand	Tektronix
Model	T921
Category	Test Equipment
Language	English