Leader Electronics Corp. LDC-824 - Fundamental Operation

4.2
©)
SSOE68
Ss)
OUTPUT/INPUT Terminal:
Output
and
input
terminal
for
a
clock
signal.
When
the
selector-switch
for
internal
and
external
(INT/EXT)
is
on
INT,
the
internal
clock
is
available
to
the
terminal.
Feed
a
clock
to
the
terminal
externally,
when
the
selector
switch
is
on
EXT.
Serial number label
Power cord
Rubber feet
Fuse holder (contains 0.3A fuse)
INT/EXT Switch:
Selector switch of an internal clock and an external clock.
With a screw driver, trimmer control adjustments of the reference frequency oscillator can
be made. For procedure, refer to section 6 — Maintenance.
Operating Instruction
Precautions in use
(1)
(2)
(3)
(4)
(5)
In
connecting
the
instrument
to
the
device
(to
be
tested),
particularly
in
an
internal
connection,
remove
all
AC
power
to
the
device,
and
remove
the
cord.
After
discharging
all
charged
capacitors,
connect
the
cable
for
measurement,
thus,
the
danger
of
an
electrical
shock
can
be
minimized.
Take
the
same
care
in
disconnecting
the
input
cable.
.Use AC-power source of LDC-824(S) at 50 — 60Hz, within 10% of rating voltage.
Caution:
Excessively
large
or
small
AC
voltages
may
induce
erroneous
operation.
In replacing the fuse, use the designated 0.3A fuse.
Avoid
all
the
severe
mechanical
shocks
to
crystal
oscillator
or
fluorescent
indicators.
Reference
clock:
Wait
about
20
minutes
for
correct
measurement
until
the
crystal
oscil-
lator gets stable in aging.
Fundamental Operation
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Disconnect the input cable of the LDC-824(S).
Connect the AC power cord to the proper AC power source.
Set POWER switch to the ON position.
Set the function switch to FREQ.
Set
the
SENSITIVITY
selector
to
20mVrms.
Put the GATE TIME Selector at 0.1S.
When
FREQ.
RANGE
Switch
is
80MHz
and
520MHz,
Display
reads
0.00
kHz
and
0.0000
MHz
respectively.
The
GATE
indication
is
lighted
for
0.1s
while
the
gate
is
open,
and
disappears
for
0.1s
while
the
gate
is
closed.
Set GATE TIME Selector at 1S.
Display
shows
0.000
kHz
at
80
MHz
and
0.00000
MHz
at
520MHz.
GATE
indicator
re-
peats
to
1s
light
on/0.1s
light
off
alternately.
Press the 10S GATE Selector
Display shows 0.0000 kHz at 80 MHz and 0.000000 MHz at 520MHz. GATE indicator
repeats to 10s light on/0.1s light off alternately.