Start And Events Triggering - Tektronix DD 501 Instruction Manual

Performance Check/Calibration—
DD
501
START AND
EVENTS TRIGGERING
Equipment
Required
1.
Test oscilloscope system
6.
Termination
(2
required)
2.
Power module
7.
Screwdriver
3.
Sine-wave
generator
8.
Adapter
(BNC
to
probe
tip)
4.
Cable
(2
18-inch
and
1
42-inch required)
9.
Digital
counter
5.
Dual
input
coupler
10.
Adapter
(BNC
T)
Before
you
begin, see klp®Kt|/IENT
in
the
Diagrams
section.
Controi
Settings
Set the
DD
501 controls as
follows:
EVENTS DELAY
COUNT
00000
EVENTS
SLOPE
IN:
4-
LEVEL
0 (midrange)
PRESET
Midrange
START
SLOPE
IN:
+
LEVEL
0 (midrange)
PRESET
Midrange
5.
Check
Trigger Slope Output
a.
Connect
a
100
millivolt,
50
kilohertz signal
from
sine-
wave
generator through a 50
ohm
termination
and
dual
input
coupler
to
EVENTS
and
START INPUT
connectors.
b.
Connect
1
0X probe from
test
oscilloscope
to
START
TRIG VIEW
probe
connector.
c.
Set
START LEVEL
control
to
display a non-
symmetrical square wave
on
test
oscilloscope.
d.
CHECK—
That square-wave
display
inverts
when
START SLOPE
switch
is
pulled out
(OUT:
—
).
e.
CHECK—
That
display
amplitude
is
at least 0.5
volt.
f.
Move
10X probe
to
EVENTS
TRIG VIEW
probe
connector.
g.
Set
EVENTS
LEVEL
control to display a non-
symmetrical square wave
on
test oscilloscope.
h.
CHECK—
That square-wave
display
inverts
when
EVENTS SLOPE
switch
is
pulled out
(OUT: -).
I.
Disconnect
10X probe from
DD
501.
6.
Check
Trigger Level and
Preset
Range
a.
Connect
a
2
volt,
50
kilohertz signal
from sine-wave
generator through a 50
ohm
termination and
dual input
coupler
to
EVENTS
and
START INPUT
connectors.
b.
CHECK—
That
START
TRIG'D and DLY'D TRIG
OUT
TRIG'D
indicators extinguish
at fully
clockwise and
counterclockwise
positions
of
START
LEVEL
control.
c.
Set
START
LEVEL
control to
PRESET
(fully
clockwise
into detent).
d.
CHECK—
That
START
TRIG'D and DLY'D TRIG
OUT
TRIG'D
indicators extinguish
at fully
clockwise
and
counterclockwise positions
of
the
PRESET
adjustment.
e.
Repeat
parts
b through d
for
EVENTS LEVEL
control
and
PRESET
adjustment.
f.
Disconnect
all
signal connections from
DD
501.
7.
Check
Triggering
Sensitivity
a.
Set controls as
follows:
EVENTS DELAY
COUNT
00000
EVENTS
SLOPE
IN:
+
LEVEL
Midrange
START
SLOPE
IN:
+
LEVEL
Midrange
Controis not mentioned can be
set as desired.
5-6
REV.
A,
NOV
1975