Calibration
—
Type
3B5
Fig.
6-5. Typical CRT display when checking tiigger slope operation (A) 4- slope; (B) — slope.
i.
Recheck
steps
c through
h and
readjust
as
necessary.
A
compromise
setting
must
be
established
which provides
correct
triggering
for
both
checks
d
and
g.
4.
Check
Low-Frequency
Triggering
Operation
a.
Change
the
following control
settings:
MANUAL
TIME/DIV
20
ms
Trigger
Function
EXT-AC
LEVEL
Midrange
SLOPE
+
b.
Set
the
low-frequency sine-wave generator for
a
one-
division
CRT
display
(one
volt peak
to
peak)
at
50
hertz.
c. CHECK—
Stable
CRT
display
can
be
obtained
with
the
LEVEL
control for
both + and —
slope
triggering.
d.
Set
the
Trigger
Function
switch
to
EXT-DC.
e. CHECK—
Stable CRT
display
can
be
obtained
with
the
LEVEL
control for both
+
and
—
slope
triggering.
f.
Without
changing
the
output
amplitude,
set
the
low
frequency
sine-wave generator
to
10
hertz.
g.
CHECK
—
Stable
CRT
display
can
be
obtained
with
the
LEVEL
control
for
both
4-
and
—
slope
triggering.
h.
Set
the
Trigger
Function
switch
to
INT-AC.
i.
Set
the
low-frequency sine-wave
generator
for
a
0.5
division
CRT
display
(0.5
volt
peak
to
peak)
at
50
hertz
(0.7
volts,
peak
to
peak,
at pin
CC
of
the
Time-Base Board for
units
other
than
the
Type 3A5).
j.
CHECK
—
Stable
CRT
display
can
be
obtained
with
the
LEVEL
control
for
both 4-
and
—
slope
triggering.
k.
Set
the Trigger
Function
switch
to
INT-AUTO.
l. CHECK—Stable
CRT
display
can
be
obtained
with
the
LEVEL
control
for
both 4- and
—
slope
triggering
throughout
the
complete
rotation
of
the
LEVEL
control.
5.
Check
Trigger Slope
Operation
and
Coupling
a. Connect
the
indicator
oscilloscope
calibrator
output
to
the
amplifier
unit
input
connector
and
the
EXT
TRIG INPUT
connector
with
the
BNC
T
connector
and
two
BNC
cables.
b. Change
the
following control
settings:
MANUAL
TIME/DIV
LEVEL
Trigger
Function
Volts/Division
(amplifier
unit)
2
ms
Midrange
INT-AUTO
2
Volts
c.
If
the
4- slope
light
is
not
on,
press
the
CHANGE
SLOPE
button.
d. CHECK—
CRT
display
starts
on
the
positive
slope
of
the
signal
(see
Fig.
6-5A)
and
the
4- slope
light
is
on.
e. Press
the
CHANGE
SLOPE
button.
f. CHECK—
CRT
display
starts
on
the
negative
slope
of
the
signal
(see
Fig.
6-5B)
and
the — slope
light
is
on.
g.
Set
the
Trigger
Function
switch
to
EXT-DC.
h.
Press
the CHANGE
SLOPE
button
to
provide 4-
slope
triggering.
i.
Turn
the
LEVEL
control
clockwise
until
the
display
is
not
triggered
(NOT
TRIG'D
readout
on).
Then
turn
the
LEVE
L
control
clockwise
slightly
until
the
CRT display
is
stable.
j. Without
changing
the
LEVEL
control
setting,
set
the
Trigger
Function
switch
to EXT-AC.
k. CHECK
—
NOT
TRIG
’
D
readout
comes
on
to
indicate
that
unit
is
not
correctly triggered. This check
indicates that
the
trigger
circuit
has
blocked
the
DC
level
of
the
calibrator
signal
to
AC
couple
the
trigger
signal
to
the
trigger
circuit.
l.
Disconnect
all
test
equipment.
Содержание 3B5
Страница 4: ...Fig 1 1 Type 3B5 Automatic Programmable Time Base unit Type 3B5...
Страница 15: ...Operating Instructions Type 3B5 TYPE 3B5 CONTROL SET UP CHART Fig 2 2 Control set up chart 2 7...
Страница 48: ...CO I o Fig 3 13 Delay and Timing Circuit logic block diagram Circuit Description Type 3B5...
Страница 61: ...GO i GO GO Fig 3 22 Seek Ciicuit Logic block diagram Circuit Description Type 3B5...
Страница 70: ...u k KJ Fig 3 29 Circuit conditions for Manual Mode operation Circuit Description Type 3B5...
Страница 71: ...w K w Fig 3 30 Circuit conditions for Seek Mode operation Circuit Description Type 3B5...
Страница 72: ...w I u U Fig 3 31 Circuit condition for External Mode operation Circuit Description Type 3B5...
Страница 88: ...Maintenance Type 3B5 Fig 4 9 Location of components on Logic Card 4 14...
Страница 89: ...u Oi Fig 4 10 Location of components on Counter Card Maintenance Type 3B5...
Страница 92: ...NOTES I...
Страница 104: ...NOTES...
Страница 106: ...Calibration Type 3B5 Fig 6 1 Recommended calibration equipment...
Страница 160: ......
Страница 176: ...J400 RtADOUT BOARD 3B5 PLUG IN A READOUT...
Страница 182: ...397 R E A D O U T B O A R D 10 6b READOUT BOARD...
Страница 184: ...FIG 1 FRONT SWITCHES TYPE 3B5 AUTOMATIC PROGRAMMABLE TIME BASE...
Страница 185: ...FIG 2 CHASSIS REAR 3 GS to TYPE 3B5 AUTOMATIC PROGRAMMABLE TIME BASE...
Страница 186: ...OPTIONAL ACCESSORIES...
