Leader Electronics Corp. LDC-823A Instruction Manual

Manual is about: DIGITAL COUNTER

Summary of LDC-823A

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    Mode l l dc - 823a digital counter instruction manual leader electronics corp..

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    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 outst...

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    Time base ldc-823a frequency accuracy general specifications display operating temperature range power source power consumption dimensions weight accessories lomhz ±5xlo-6 (±5ppm) (32°f - 104°f) (o°c _ 40°c) 8 digits, 7 segment fluorescent display overflow indication, gate indication and zero blanki...

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    Ication, )f trans- 3. Panel functions .3.1 front panel fig. 3-1 fig. 3-1 shows the front panel of ldc-823a. Cd power switch: to turn on, depress push-button, to turn off, again depress push button. ® gate time; multipl ier selector: for frequency measurement, this switch is used to change gate t ime...

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    ® sensitivity selector: push button switch for 20mv, 200mv, respectively. (j) impedance selector: selector for input impedance of imn and son. ® input connector: put a signal in to measure. ® handle/stand combination: the lock of the handle can be released by pressing the mounted part of the handle ...

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    Je on both released, it e: and "khz" range, the is i it. ,e case of rrange indi- output/input terminal: output and input terminal for a clock signal. When the selector-switch ®l for internal and external (int/ext) is on int, the internal clock is available to the terminal. Feed a clock to the termi...

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    (9) set the function switch to period. (10) use the "multi" scales, and confirm the display as shown in table 4-2-1. In the case that the displayed figure shows other than 0 (zero), or when gate indicator is lighted, push the reset switch, then, gate indicator disappears (gate is closed), and the di...

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    -2-1. In the case that ator is lighted, push the display shows as nnec t the ground _ he positive hot side e maximum allowable values are as follow: )c. When the input are the maximum below. K when connecting t pulses of flyback .Uld be damaged by ) these circu its. ' proximately 30pf. Ce becomes 10...

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    (4) input sensitivity by duty ratio with ldc-s23a, trigger level of schmidt circuit is set in such a way so that it will lye at the maximum sensitivity against the signal of 50% duty ratio, such as sine wave, triangular wave and rectangular wave. When the duty ratio is reduced, the dc level of the s...

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    Such a way so that it will be at tio, such as sine wave, triangular , al added to schmidt circuit will eed the lower limit of hysteresis upper limit of - - hysteresis level dc level - - __ lower limit of hysteresis level .Tio = x 100 (%) to ease in the du ty ratio. In the will be approx. 1/5 com- r...

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    ..... O front panel input attenuator reset eset latch seouential rear panel b output / input amplifier ]fjhz """ 250mhz prescalar 2sdmhz ).10 s h ap er gat e fp.E\..J fluorescent display e digit overflow unit display driver coun ter l atch t im e base selector pe r i 00 ytd - . - y.O ___ i regular t...

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    Cr 0 0. U 0 i -' ! " .... " u 0 -' " .... X 6. 1) to calibrate or adjustment to the reference oscillator. Set gate time selector to los and freq. Range selector to 80 mhz. 3 a standard 10mhz signal generator with an accuracy greater than ±1 x 10-8 is required for calibration. Apply the output ...

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    R 166 ikn v ik(l r168 2.2k q (105 sc hemati c c - 2 5 moae i ldc - 8 234 display counter i ii' i, t , .. , " t 0-1073 leader electronics corp. T, ,r.

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    L 31 ci intju i j2 o.Luf s2 5v rj 100 ko jl to jl01 001 r4s 5" ';j; •• 1ko 0 pese t s5 iu5 0---5 v los -- 5v is gate time s8>o-_ from ' 0 signal ... I - o,ls c,o o.Oi}jf ;j, 1. Ls 02 , . -i 11, r15 loon schematic t if ,'i llhhl sc hema tic mooel ldc-823a display counter u i i ,,\1 1/1 ii c10...

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    Ext 0----05701 j'02 pa02 i i 8 i _ - (405 0407 0406 c404 +-1 }jr 10lg1 ioz61 - sov l00jj ____ , m 47ko q403 250235-0 -12v x301 10mhzd 11 2 £ 302 33pf 68kcl 1 i 2i c30s mloop, r406 47' ldc-823s schematic model ldc-823 a 0-1075 std.Osc. Power divider.

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    84031km leader electronics corp . 2-6-33 tsunashima-higashi. Kohoku-ku. Yokohama. Japan. Phone: (045) 541-2121 telex:j47780 jpleader leader instruments corp. 3 800ser avenue. Hauppauge. N.Y. 11788 u.S.A. Phone: (516) 231 -6900 telex: 510-227-9669 leader haup printed in japan..