SU1298678A1 - Digital frequency meter - Google Patents

Abstract

This invention relates to a measurement technique and can be used. Used in automatic frequency meters. The aim of the invention is to improve accuracy and speed. The device consists of a start bus 21, a driver 1, keys 2 and 5, a counter 3, a source of an exemplary frequency 4, a frequency divider 6, triggers 13, 14 of the element 16 And, to achieve this goal, switches 7 and 9 are entered, switch 8, counter 10, single sftifciHi 18 with S (L

Description

P, 12, 15 and new functional relationships formed. The result code is output from the device output 18, the measurement accuracy limit code is output from output 19, the actual measurement time code is output from output 20. the measurement end and start signal

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The invention relates to a measuring technique and can be used in automatic measuring astrota.

The purpose of the invention is to increase accuracy and speed.

The drawing shows the functional diagram of the device.

The device consists of the driver I, the first key 2, the first counter 3, the source 4 of the exemplary frequency, the second key 5, the divider

6 frequencies, first switch 7, switch 8, second switch

9, the second counter 10, the first single vibrator 1, the second single vibrator 12, the first trigger 13, the second trigger 14, the third single vibrator 15, AND 16, the input bus 17, the device outputs 18-20, the launch bus 21, and exit 22.

The output element And 16 is connected to the reset input of the first trigger 13, the output of which is connected to the control input of the first key 2, and the first input to the output of the second trigger 14. To the inputs of the first switch

7 connects the high-end outputs of the decades of the first counter 3, the control inputs of the first switch 7 are connected to the outputs of the switch 8, the outputs of the second switch 9 are connected to the inputs of the second switch 9, the outputs of the second counter 10, the output of the first switch are connected to the control inputs of the second switch 9 7 is connected to the installation input of the second trigger 14, the output of the second switch 9 is connected to the second input of the element 16 and the counting input of the second counter 10, the input of the first one-oscillator 11 pod.token to the start bus 21, and the output to during the second monostable multivibrator 12 and the reset inputs of the counters 3 and 10

registration - from output 22. The presence of a signal about the end of measurement allows reducing the time between two measurements, which increases the speed and efficiency of the device., 1 sludge.

and a frequency divider 6, the output of the second one-shot 12 is connected to the installation input of the first trigger 13 and the reset input of the second trigger 14, the output of the first trigger 13 is connected to the control input of the second switch 5 and to the input of the third one-shot 15, the outputs of the switch 8, the counter 3 and 10 and third

the one-shot 15 are, respectively, the outputs of the device 19j 18, 20 and 22,

The device works as follows.

A synchronization pulse applied to the start-up bus 21 triggers a single-vibrator 11, which, with its short impulse, flushes the divider 6 counters down to the rear.

the one-shot 1I starts the one-shot 12, which sets the trigger 13 to the trigger 13 to the trigger 13 in a short pulse. The keys 2 and 5 close. The result counter 3, consisting of decades 3.1-3.5, starts counting the input pulses, and the divisor 6 consisting from the decals 6.1-6.5, begins to divide the frequency of the source 4. When the counter 10 is reset, the output of the younger decade 6.1 is connected to the output of the switch 9. When this decade overflows, the counter 10 is added}, the output of the second decade is connected to the output of the switch 9

6.2, with the overflow of which the output of the third decade 6.3 is connected to the output of the switch 9, and so on. Thus, when the switch 5 is closed, the output of the switch 9 appears pulses, the first of which occurs in 10 T the second through time is 100 T, the third through time is 1000 T, and so on. d., where TO is the period of the source signal 4.

Similarly, at the inputs of the switch 7, overflow pulses of the counter decades appear with 3 pulses of the measured frequency. The output of one of the decades, depending on the required measurement accuracy, is selected using the switch B,

When during the counting of the input pulses generated by the shaper 1, one of the decades of the counter 3 5 is selected by the switch 8, a pulse appears at the output of the switch 7, which sets the second trigger 14 to 1, the counting process does not stop. 2 and 5 remain closed.

 After the second trigger 14 is set to 1, the pulse from the output of switch 9 through element 16 sets trigger 13 to O, keys 2 and 5 open and the counting process stops, the one-oscillator 15 is started and delivers a short pulse to output 22 of the device the recording devices are started up. This pulse is a signal indicating that the measurement is completed, after which the next start of the device for measurement can be performed.

Thus, the result code is output from the device output 18, the measurement accuracy limit code from output 19, the actual measurement time code from output 20, the signal to end the measurement and start recording from output 22,

Claims (1)

The presence of a signal about the end of the measurement reduces the time between two measurements, which increases the speed and performance of the device. Digital frequency meter containing start-up bus, sequentially. Compiled by E.Iinkin Editor N. Bobkova Tehred I. Tsopovich Order 885/48 Circulation 731 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 Shaped driver, first key and first counter, serially connected source of exemplary frequency, second key and frequency divider, as well as two flip-flops and an element whose output is connected to the sbs input of the first trigger, whose output is connected to the control input of the first key, and the first the input element And connected to the output of the second trigger, characterized in that, in order to improve accuracy and speed, it introduced two switches, a switch, a second counter and three one-oscillator, and to the inputs of the first switch The high-end outputs of the decades of the first counter are connected, the switch outputs are connected to the control inputs of the first switch, the outputs of the second switch are connected to the control switch inputs of the second switch, the outputs of the first switch are connected to the control inputs of the second switch, the output of the second switch is connected to the second input of element K and the counting input of the second counter, the input of the first one-oscillator is connected to the start bus, and the output is connected to the input of the second single and the reset inputs of both counters and a frequency divider, the output of the second one-shot is connected to the installation input of the first trigger and the reset input of the second trigger, the output of the first trigger is connected to the control input of the second switch and the input of the third one-shot, and the outputs of the switch, the first and second counters and the third one-shot is the output of the yuscorrector S. Shekmar