Operating
lnstructions—7B53A/7B53AN Operators
10.
Press the
DLY'D Time/Division switch to the inner
position
for the DLY'D SWP Display Mode. Note the
magnified
display with
sweep rate
determined by the
DLY'D Time/Division switch.
The oscilloscope Intensity
may
need to be increased
to view the delayed sweep
display.
11. Pull
out the VARIABLE Time/Division knob for
the
MIXED Display
Mode (MIXED Display Mode can be
selected
when
operating in the DLY'D
SWP Display Mode
only).
Note
that the main sweep is
displayed at a rate
determined by
the TIME/DIV
OR DLY
TIME switch
followed by a delayed sweep
display at the rate determined
by
the
DLY'D
Time/Division
switch. Rotate the DELAY
TIME
MULT
dial and note that the amount of display
allocated
to each
sweep is determined
by the DELAY TIME
MULT
dial.
Main
and Delayed
Sweep Triggering
Functions
The following
procedure checks
the operation of the
main
and delayed triggering
controls:
Partial
Procedure.
To
begin
the Operating Checkout
with
triggering,
perform steps 1
through 5 of the Setup
Procedure
provided at
the beginning of
the Operating
Checkout.
Connect
the 1-kilohertz
calibrator signal from
the
indicator oscilloscope
to the vertical unit
Input and
adjust for
about four divisions of vertical display.
12. Set the TIME/DIV
OR DLY
TIME switch and the
DLY'D
Time/Division
switch to 1 ms and press in
the
DLY'D
Time/Division
switch and the Variable control.
CHECK—that
a stable display can be obtained with the
COUPLING
switch for
MAIN TRIGGERING
set to AC, AC
HF
RE J,
and DC for both the
positive and negative
positions
of
the SLOPE switch (MAIN TRIGGERING
LEVEL
control may be adjusted as necessary to obtain a
stable
main sweep display). Remove all connections from
the
oscilloscope
system.
13. Connect a 60
hertz signal (line voltage, etc.) with a
50-ohm
cable or voltage probe to the vertical
unit Input
and
adjust the
Volts/Div
switch for about four divisions of
display.
Set the
MAIN
TRIGGERING
COUPLING switch
to
AC LF
REJ and set the TIME/DIV OR DLY TIME
switch
to
10 ms. Rotate the MAIN TRIGGERING LEVEL
control
throughout its range and check that
a stable display
cannot
be obtained (TRIG'D
light off).
14. Change
the
MAIN
TRIGGERING SOURCE switch
to LINE and
the COUPLING switch
to AC. Check
that a
stable
main
sweep display can be obtained
with the MAIN
TRIGGERING COUPLING switch
set
to AC, AC HF REJ,
and
DC (MAIN
TRIGGERING
LEVEL control may be
adjusted
as necessary). Remove all
connections
from the
oscilloscope system.
15. Connect
the
indicator oscilloscope Calibrator signal
to
the vertical unit Input connector and to the MAIN TRIG
IN connector.
Set the Calibrator for a
0.4 volt, 1 kilohertz
signal
and
adjust
the vertical unit Volts/Div switch for
about four divisions of display.
Set the TIME/DIV OR
DLY
TIME
switch and
the DLY'D Time/Division switch to 1
ms.
Set
the MAIN TRIGGERING SOURCE switch to EXT and
check that a stable
display can
be obtained with the
COUPLING switch for MAIN TRIGGERING
set to AC, AC
HF REJ,
and DC, for
both the
positive and negative
positions
of
the
SLOPE switch (MAIN TRIGGERING
LEVEL
control may be adjusted as necessary for a stable
display).
16. Change the MAIN
TRIGGERING SOURCE switch
to
EXT
-r
10. Set the oscilloscope Calibrator for 4 volts at
1
kilohertz
and adjust the vertical unit Volts/Div switch for
about
4 divisions of display. Check that a stable display can
be
obtained
with the COUPLING switch for MAIN
TRIGGERING
set to AC, AC HF
REJ, and DC, for both
the
positive
and negative positions of the SLOPE switch
(MAIN
TRIGGERING LEVEL control may
be adjusted as
necessary
to obtain a stable
delaying sweep display).
Remove the Calibrator
signal from
the MAIN TRIG
IN
connector.
17. Set
the MAIN TRIGGERING COUPLING switch to
AC
and
the
SOURCE switch to INT. Adjust the MAIN
TRIGGERING
LEVEL
control for
a stable display. Set the
MODE
switch to NORM and
check for a stable display.
Change the
MODE switch to
AUTO and adjust the LEVEL
control
for
a free-running display. Change
the MODE
switch
to NORM and check for no display.
18.
Adjust the
MAIN
TRIGGERING
LEVEL control
for
a stable
display. Change the MAIN TRIGGERING
MODE switch to
SINGLE SWP. Press the RESET button
and
check for one sweep.
Remove the 1 kilohertz signal
from the
vertical unit
and press the RESET button. CHECK
for
no display and that the READY
light is on. Connect the
1
kilohertz
signal to the vertical unit and check for one
sweep
as the signal
is applied.
19. Set the
MAIN TRIGGERING MODE switch to
AUTO. With theTIME/DIV
OR
DLY TIME switch at 1 ms,
pull
out
the
DLY'D Time/Division
switch and rotate to .2
ms
(Intensified Display Mode). Rotate the MAIN TRIG
GERING
LEVEL control for a stable display (oscilloscope
Intensity
may need to be
varied to
view the intensified
display).
Rotate the
DELAY TIME MULT dial and note
that
the intensified
portion
of display is continuously
variable.
1-6
