Leader Electronics Corp. LDC-824 - Page 9

(3) | Measurements of Modulated Signals
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VH: Input Sensitivity of
counter
As
seen
in
the
above
Fig.
4-4-3,
in
order
to
measure
the
frequency
of
modulated
Modulated signal
carrier-wave,
if
the
voltage
of
highest
modulated
part
is
greater
than
the
input
sensitivity
VH
(0.02Vrms),
it is
then
possible
to
count
the
carrier-wave.
4.5 Frequency measurement
Set
the
function
switch
to
FREQ.
and
apply
signal
to
the
input
connector.
The
measuring
range
is
10Hz
—
520MHz.
By
setting
the
GATE
time
to
the
values
shown
in
Table
4-5-1
and
Table
4-5-2,
measurement
can
be
done
at
the
maximum
resolution
without
overrange.
DIRECT MEASUREMENT (up to 80 MHz)
Gate
Time
Measuring
frequency
Display
10
S
10Hz
—
9999.9999kHz
|
0.0100kHz
—
9999.9999kHz
1S
10Hz
—
80000.000kHz
|
0.010kHz
—
80000.000kHz
0.1S
10Hz
—
80000.00kHz
0.01kHz
—
80000.00kHz
Table
4-5-1
PRE-SCALER
(up
to
520
MHz)
Gate Time Measuring frequency Display
10
S
10Hz
—
99.999999MHz
|
0.000010MHz
—
99.999999MHz
1S
0.00001MHz
—
520.00000MHz
0s
Table 4-5-2
In
measuring
the
frequency
of
10Hz
—
1kHz
at
a
high
resolution,
period-measurement
is
more
suitable.
4.6 Period measurement
(1)
Set
the
function
switch
to
PERIOD,
and
apply
the
signal
to
the
input
connector.
The
measuring
range
is
100ms
—
0.001ms
(1us).
Period
measurement
is
suitable
for
accurate
measurement
in
the
frequency
range
of
10Hz
—
1kHz.
By
setting
the
MULTI.
and
PERIOD
as
listed
in
Tables
4-6-1
and
4-6-2,
more
accurate