Performance
Check
—Type
3B5
display.
Also
check
that the
MAG’D
SWP readout
is
on
when
the
DLY
’
D
SWP MAG switch
is
set
to
X10
or
X
1
00.
Check
timing
accuracy
between
the
first
and
ninth
graticule
lines.
A typical CRT
display
is
shown
in
Fig.
5-8.
CAUTION
To
prevent
permanent
damage
to the CRT phos
phor,
either
reduce the trace intensity
at slow
sweep
rates
to
a
level
which
does
not
produce
a
halo
around
the
spot
or
position
the
baseline
of
the
marker
display
below
the
viewing
area.
h.
Disconnect
the
trigger
cable.
14.
Check
Operating
Mode
REQUIREMENT—
Instrument
operates
correctly
in
the
mode
selected
by
the
EXT,
MAN
and
SEEK
buttons.
a.
Change the
following
control
settings:
DLY'D
SWP
MAG
OFF
MANUAL
TIME/DIV
1 ms
Trigger Function
INT-AUTO
Volts/Division
0.5
Volts
(amplifier
unit)
b.
Connect
the
time-mark
generator
to
the
amplifier unit
input
connector through
a
50-ohm
BNC
cable
and
a
50-ohm
BNC
termination.
c.
Set the
time-mark
generator
for
one
-
millisecond
markers.
d.
Press
the
SEEK button.
e. CHECK
—SEEK
button
lights
and
a
stable
display
is
presented
f.
Press
the
EXT
button
momentarily.
g.
CHECK
—
EXT button
lights
as
long
as
it
is
held
de
pressed.
h. Release
the EXT button.
i. CHECK
—
MAN
button
lights
and
a
stable
display
is
presented.
15.
Check
Cy
cl
es/Sweep
REQUIREMENT
—Two
to
six
cycles
displayed in
Seek
Mode.
a. Press
the
SEEK button.
b.
CHECK
—
CRT
display
for
two
to
six
cycles (nominal
CYCLES/SWEEP
adjustment).
c.
ADJUST
—Hold
the SEEK button depressed
and
adjust
the
CYCLES/SWEEP adjustment
(on
front
panel)
for
the
desired
number
of
cycles
in
the display (this
adjustment
selects
a
nominal
range
of
operation; exact
number
of
cycles
displayed
for
a
particular
signal
will
vary
due
to
the
sweep
rate
selected
by
the
Seek
Circuit).
Allow
the
seek
circuits
time
to
recycle
between
adjustments
(about
one
to
two
seconds).
d.
Disconnect
the
time-mark
generator.
16.
Check
Seek
Mode
Operation
REQUIREMENT—Correct
operation
with
seek
command
from
remote-seeking
probe,
amplifier
unit
program
con
nector,
front-panel
SEEK
button
and
Type
3B5
PROGRAM
connector.
Does
not
seek
when
amplifier
unit
seek button
is
pressed.
a.
Connect
the
remote-seeking
probe
to
the
automatic/
programmable
amplifier
unit
input
connector.
b.
Connect
the
probe
tip
to the
indicator
oscilloscope
calibrator
output
connector.
c.
Press
the
seek
button
on
the
remote-seeking probe.
d. CHECK
—
Both
the
amplifier
unit
and
the
Type
3B5
seek
a stable
CRT
display
showing
between
two
and
six
cycles
horizontally
and
two
to
six
divisions
vertically
(may
vary
due
to
calibration
of
front-panel
adjustments).
e. Connect
a
jumper
lead
(#18
or
#20
wire)
between
terminals
4
and
22
of
the
amplifier
unit
program
connector.
f.
CHECK
—
Both
the
amplifier
unit
and the Type
3B5
seek
a
stable
CRT
display
(units continuously
recycle approxi
mately
every
two
to
four
seconds).
g. Disconnect
the
jumper
lead.
h.
Press
the
front-panel
seek
button
on
the
amplifier
unit.
i.
CHECK—
Only
the
amplifier
unit
seeks.
j.
Press
the front-panel
SEEK
button
on
the
Type 3B5.
k.
CHECK—
Only
the
Type
3B5
seeks
a
stable
display.
l. Connect
a
jumper
lead
between
terminals 12 and
22
of
the
Type
3B5
PROGRAM
connector.
m.
CHECK—
Only
the
Type
3B5
seeks
a stable
display
(unit
continuously
recycles
every
one
to
two
seconds).
17.
Check
Seek
Mode
Frequency
Response
REQUIREMENT
—Correct
Seek
Mode
operation
from
30
hertz
to
20
megahertz.
a.
Connect
the
low-frequency
sine-wave
generator
to
the
amplifier
unit input
connector
through
the
BNC
cable
(use
the
BNC
to
alligator
clips
adapter
to
connect
the
generator
output
to
the
BNC
cable).
b.
Set
the
low-frequency sine-wave
generator
for
about
two-volts
output
at 30
hertz.
c.
Set
the
Test
Function
switch
to
EXT-DC
d.
CHECK
—
Slowly
increase
the
output
frequency
of
the
low-frequency
sine-wave
generator
and
check
that
the
unit
progressively
seeks
the
next
faster
sweep
rate
presenting
a
stable
display
(leave
on
continuous
seek)
as
the
frequency
is
increased.
Allow
time
for
the
seek
circuits
to recycle
(about
one
to
two
seconds)
before
increasing
the frequency.
Check
from
30
hertz
to
2
megahertz.
e.
Disconnect
the
low-frequency
sine-wave
generator
and
connect
the
time-mark
generator
to
the
amplifier
unit through
the
50-ohm
BNC
cable
and
the
50-ohm
BNC
termination.
f. Set
the
time-mark
generator
for
50-nanosecond
markers
(20
megahertz
sine
wave;
this
check
can
only
be
made
with
an amplifier
unit
which
has
a
bandpass
of
at
least
15 MHz).
g.
CHECK
—
A
stable
CRT
display
is
presented
(20
cycles
displayed;
readout-panel
indication,
.1
/is/DIV)
before
the
seek
circuits
recycle.
5-9
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...