Leader Electronics Corp. LDC-823A Instruction Manual - page 2
1.
Imroduction
LDC-823A
DIGITAL COUNTER
23A
is a
digital frequency counter/timer designed to measure the frequency and period
o
.
a
.
al
.
featuring
a wide frequency range (10Hz-2SOMHz), a high input sensitivity (20mV rms),
a.:!
h'
h
resolu
tion to S digits. The period
function
makes the unit outstanding for video tape record
er
sef\;ce
applications. This
instrument
can
be used for adjustment, test and repair of audio instru
:nems.
AM
/
FM
radios,
TVs, CB radios, computer clocks, amateur-radios, electronic watches, and ,
musical instruments. etc. The LDC-S23A is small and portable. A big bright fluorescent display
assures easy read
a
bil
i
t
y of values. The green display does not induce eye fatigue even after an extended
period
of
\;ewing.
Readout
miscounts are reduced by zero-blanking, unit-display (kHz, MHz, mS) and
ove
ange display.
The
use of LSI and MSI in the internal circuit assures reliable performance and less.
over consumption.
2.
Specifications
Frequency
Measurements
Range
Gate time
Resolution
Accuracy
Period Measurements
Range
Multiplication Factors
Resolution
Accuracy
Input Section
Input sensitivity
(
I
M
n
)
(son)
Attenuator
Coupling
Input impedance
Maximum
i
np
u
t
voltage
(
I
M
n
)
(son)
10Hz - SOMHz (direct), 10Hz - 2SOMHz (pre-scaler)
O.lS, IS, lOS
10Hz, 1Hz, O.lHz (direct), 100Hz, 10Hz, 1Hz (pre-scaler)
±1 coun t ± time base accuracy
lOOmS
-
l/lS
X10, X100, X1000
10/lS, l/lS, O.l/lS
±1 count ± time base accuracy ± trigger error
SOmVrms (10Hz - 100Hz)
20mVrms (100Hz
-
100MHz)
SOmVrms (100MHz - 2SOMHz)
20mVrms (100kHz - 100MHz)
SOmVrms (100MHz - 2SOMHz)
1,
1/10
AC
Switch able
IMn
and
Son.
10Hz
400Hz
100Vrms
400Hz
100kHz
20Vrms
100kHz
10Hz
2SOMHz: SVrms
2SOMHz : SVrms
...... 1 ..... .