Datapulse 101 - Page 14

Switch the REPETITION RATE selector to the (-) EXT TRIG
SLOPE, the external trigger source to its negative output, and
repeat steps d and e (above).
2. 3. 7 Line Slope Triggering
a.
b.
Turn the REPETITION RATE selector to the (+) LINE SLOPE
position but retain all other control settings of step 2. 3. 6.
Set the oscilloscope sweep to 5 MS/cm and synchronize it to the
ac line (by the oscilloscope sync control).
Turn the unit on and vary the TRIGGERING LEVEL control noting
that pulses appear on the oscilloscope, then shift and disappear as
the control is varied.
Switch the REPETITION RATE selector to the (-) LINE SLOPE
position and repeat step c.
2. 3. 8 Gating Operation
a.
b.
Set the REPETITION RATE selector to 0. 1 MHz with its vernier
fully clockwise.
Turn the PULSE DELAY selector to O. 1 us and its vernier fully
counterclockwise.
Switch the PULSE WIDTH selector to l. 0 uS with its vernier
fully clockwise.
Set the
PULSE
MODE
switch
to
SGL
and
the
POSITIVE
AMPLITUDE
to
the
10V
position.
Set the GATE MODE switch to the SYNC position.
Connect
an
external
gating
source
(Datapulse
101,
or
equivalent)
to
the
ENABLING
GATE
INPUT
jack.
Set the
gating
signal
REPETITION
RATE
to
1.
0
KHz,
PULSE
DELAY
to
10
uS
and
PULSE
WIDTH
to
0.
1
MS
with
all
verniers
fully
clockwise,
and
adjust
its
POSITIVE
AMPLITUDE
to
2
volts.
CAUTION
Do not exceed the maximum permis~
sible signal level of 10 volts.
Use
the
real
time
oscilloscope
with
its
dual
trace
attachment
to
monitor
both
the
gating
signal
(upper
trace)
and
the
POSITIVE
OUTPUT
of
the
unit
being
tested
(lower
trace).
Synchronize
the
oscilloscope
with
the
gating
signal
generator
REFERENCE
TRIGGER
OUTPUT
and
set
its
sweep
to
20
uS/cm.
Adjust
the
amplitude
of
2-7