Datapulse 101 - Page 13

d.
e .
Turn
the
PULSE
DELAY
selector
to
the
10
uS
position
and
its
vernier
fully
counterclockwise.
Turn
the
PULSE
DELAY
vernier
clockwise
noting
that
a
second
pulse
appears
on
the
oscilloscope
and
moves
smoothly
from
left
to
right
as
the
vernier
is
turned
clockwise.
Vary
the
PULSE
WIDTH
vernier.
Both
pulses
should
change
successively
and
follow
the
control
variations.
2.3. 5 Single Cycle Operation
a.
b.
d.
(D
Monitor
the
output
with
the
real
time
oscilloscope
synchronized
to
the
REFERENCE
TRIGGER
OUTPUT
with
its
sweep
set
to
O.
l
MS/cm
and
its
amplitude
set
to
5V/cm.
Set
the
GATE
MODE
switch
to
the
NON-GATED
position
and
the
PULSE
MODE
switch
to
SGL.
Switch
the
REPETITION
RATE
selector
to
the
SINGLE
PULSE
position.
Turn
the
PULSE
DELAY
to
10
uS
and
its
vernier
fully
counter-
clockwise.
Set the PULSE WIDTH to 0. 1 MS with its vernier fully clockwise.
Turn the AMPLITUDE to a convenient setting and switch the
POWER ON.
Press the SINGLE PULSE button and verify that one pulse only
appears on the oscilloscope each time the button is pressed.
2.3. 6 External Trigger Operation
a.
Switch the REPETITION RATE selector to the (+) EXT TRIG
SLOPE position and the PULSE WIDTH to 10 uS but retain the
other control settings and oscilloscope connections of step 2. 3.5.
Connect the external trigger source (Datapulse 101 or equivalent)
to the TRIGGER INPUT jack and set its REPETITION RATE to
10 KHz with vernier fully clockwise, its PULSE DELAY to
minimum and its PULSE WIDTH to approximately 30 nanoseconds.
Turn both the trigger source and the unit under test on.
Adjust the TRIGGERING LEVEL control until several pulses
appear on the oscilloscope.
Turn the external trigger source REPETITION RATE vernier
counterclockwise and note that the number of pulses on the oscillo-
scope reduces successively as the trigger repetition rate is
decreased.
2-6