Operating
Instructions—7B53A/7B53AN
Operators
DLY'D TRIG
LEVEL
SLOPE
COUPLING
SOURCE
Sweep
Controls
POSITION
MAG
TIME/DIV
OR DLY TIM
DLY'D Time/Division
VARIABLE
Variable
Selector
DELAY
TIME
MULT
RUNS AFTER
DLY
TIME
(fully clockwise)
(+)
AC
INT
Midrange
X1-IN
1
ms
1
ms
CAL
(fully clockwise)
Main Variable
1.00
5.
Set
the
indicator
oscilloscope to display
the plug-in
units
and adjust
for a
well defined display. See indicator
oscilloscope
and vertical
unit instruction manuals for
detailed
operating
instructions.
5. Rotate
the
POSITION control and note that
it
horizontally
positions the trace. Rotate the FINE control
and
note that it
provides precise horizontal positioning.
Disconnect
the calibrator signal.
Sweep
Calibration
NOTE
For
accurate sweep
timing,
apply a signai of known
frequency
or time period
(time-mark
signal, calibrator
square wave,
60 hertz line etc.) to the associated
vertical
amplifier
unit and adjust the TIME/DIV OR
DLY
TIME switch and the SWP CAL control to
calibrate
the signal to the oscilloscope graticule. Be
sure
that the
sweep timing signal is accurate within
0.5%.
The following
sweep calibration procedure uses
a
TEKTRONIX Time-Mark Generator.
Sweep Control
Functions
The
following
procedure checks the operation of the
sweep
controls and checks
the Display
Modes.
Normal
Sweep
1.
Perform
steps one through
five of the Setup
Procedure.
6.
Connect
a 1 millisecond time-mark signal from the
Time-Mark Generator with a 50-ohm
BNC coaxial cable and
50-ohm
BNC
termination to the Input of the associated
vertical
unit.
Adjust
the vertical Volts/Div switch for about
four
divisions of
display and
rotate the MAIN TRIG
GERING
LEVEL
control for a
stable display. Check the
CRT
display for one complete
time-mark per division
(position
as
necessary). If necessary, adjust the SWP CAL
screwdriver
adjustment
for one complete time-mark
per
division
over the center eight divisions of display. Dis
connect
the
Time-Mark Generator.
NOTE
The Time/Division
switch
selects main
sweep rates,
delayed sweep rates,
and Display Modes (MAIN SWP,
INTEN,
DLY'D SWP,
and MIXED).
Refer to
Selecting Sweep
Rates and
Display Modes discussions
in the General
Operating Instructions for further
information.
2.
To
select the MAIN SWP Display Mode, press in the
DLY'D
Time/Division knob, and
set the TIME/DIV
OR
DLY
TIME switch
and the DLY'D Time/Division switch to
the same sweep rate (1 ms).
3. Connect the one-kilohertz calibrator
signal from the
indicator
oscilloscope to
the vertical amplifier unit Input.
Adjust
the Calibrator and the vertical Volts/Division switch
for
four
divisions of display.
4.
Rotate
the MAIN TRIGGERING LEVEL control for
a
stable
MAIN SWP display (non-delayed).
Rotate
the
DELAY TIME
MULT dial and note that it has no effect on
the
display.
Intensified, Delayed,
and
Mixed
Sweep
7.
Reconnect
the oscilloscope Calibrator signal to the
vertical
unit and adjust for
about four divisions of vertical
display.
Pull out the DLY'D Time/Division
knob and
rotate
clockwise to
.1 ms/DIV for
the INTEN Display Mode
(TIME/DIV
OR DLY TIME switch remains at 1 ms/DIV).
Note
that a
delaying sweep with an intensified portion
(delayed sweep)
is displayed on the CRT
(the oscilloscope
Intensity
may need to be
varied to view the intensified
display).
8.
Rotate
the
DELAY
TIME MULT dial and note that
the
amount of delay time before the intensified portion of
display
is controlled by the DELAY TIME MULT dial.
9.
Rotate the VARIABLE
control counterclockwise out
of switch
detent and
note that the sweep rate indicated by
the TIME/DIV
OR DLY
TIME switch can
be varied to at
least
the sweep rate of
the next adjacent position (2
ms/DIV). The internal Variable
Selector connector must be
set for
variable main sweep rates. Return the VARIABLE
control
to
the
CAL position.
1-5
