SU488160A1 - Digital Frequency Meter and Frequency Ratio - Google Patents

Description

one

The invention relates to electrical measuring equipment and can be used to increase the speed and simplify frequency and frequency ratio meters.

Known digital frequency meter and the ratio of two frequencies of electrical oscillations, containing an input pulse shaper, the output of which is connected via a selector of a measured frequency period to the first input of a vertex frequency pulse shaper formed by two keys, ten magnetic integrating circuits, an OR circuit and a block power supply, as well as associated with the input of the nonnous reference circuit of the additional discharge formed by the coincidence circuit, a nonius key and a counter, add It is connected to the first input of the main key, the output of which is connected to the first input of the main estimator, the second input — with the output of the time measurement interval generator formed by the reference frequency generator, the switch, the key, the pulse frequency divider, and the trigger is characterized by reduced speed and sophisticated designs.

The purpose of the invention is to increase the speed of the device.

This is achieved by the fact that in the proposed meter, the output of the selector period of the period e2

my frequency is connected to the key input of the time measuring range generator, the selector start input is connected through the delay element to the output of the vernier coincidence circuit of the additional bit and the installation input of one of the two possible vernier frequency generator converters, the input of which is connected to the potential the input of the vernier key and the output of the frequency divider, the output of the additional discharge counter is connected to the second input of the main counter. This implementation allows you to use it.

speed and simplify the design.

The block diagram of the proposed meter is shown in the drawing.

The meter consists of an input driver 1 pulses, a key 2, a main counter 3 pulses, a digital indication unit 4, a driver 5 time measurement interval formed by the reference frequency generator 6, a switch 7, a key 8, a divider 9 reference or second

frequency and trigger 10, the selector 11 period of the measured frequency; the vernier scheme 12 of the reference of the additional discharge, formed by the scheme 13 of coincidence, the vernier key 14 and the counter 15 of the additional discharge; shaper 16 sequences of Ioious frequency pulses formed by keys 17 and 18, magnetic integrating circuits 19-28 with transistor switches, logic circuit "OR 29 and power supply unit 30; and the delay element 31. The Pb meter works as follows. The first and second pulses of the measured frequency are sent from the output of the former 1 to the input of the selector 11, which forms the output pulse with a duration equal to the period of the measured frequency. This impulse is applied to the control input of the key 17 of the driver 16. The key 17 opens for a time equal to the duration of the period Tx of the measured frequency. Under the influence of the voltage applied by the key 17 to the recording windings from the power supply unit 30, the cores of the keys of the circuits 19-27 are re-magnetized from the outgoing state — I — by the amount Bi. The output pulse of the selector with its trailing edge opens the key 8, through which the frequency pulses fx, or the frequency pulses begin to arrive at the frequency divider 9 input (depending on the position of the switch 7). Two output pulses of the divider 9, limiting the formed interval, are fed to the counting input of the trigger 10, which opens the key 2. The pulses of the measured frequency pass through the key 2 to the main counter 3 preset to the unit state. During the time of the trigger pulse 10, the counter 3 records the number of pulses I-I, corresponding to the number of pulses 1 through the pulses input and reflecting the value of the higher bits of the measurement result. The first pulse of the measuring time interval opens the key 14, the transistor switch of the circuit 19 and the switch 18, through which the recording winding of the circuit 28 applies a voltage Uc to the reversal core of the circuit 28 from the initial magnetic state k - V:: When opening the transistor switch of the circuit 19 through its readout winding begins to flow a remagnetizing current returning the core of the circuit 19 to the initial state. The application from the feedback winding keeps the key transistor of the circuit 19 in the open state at the end of the input trigger pulse. When the saturation of the core is reached, the voltage on the feedback winding hits to zero and the transistor is closed by the Smegten voltage. The voltage Uc is chosen in such a way that the duration of the output pulse of circuit 19, which determines the pulse repetition period of the ionic frequency Hn, is 1.1 Tx. The leading edge of the differentiated output pulse of circuit 19 enters the triggering of circuit 20, operating similarly to keke 19, etc. The rear edges of the output pulses of circuits 19-27 are put on the diode circuit of the ILP 29, the output of which removes the sequence of nine pulses of the first Noiiusi frequency. following with iriodom repetition T „g-guvyh, 1,1 T,. Between the two output pulses of the circuit OR 29 and the action of the voltage Us applied to the recording winding of the circuit 28, its core is re-magnetized from the initial magnetic state — Br to the magnitude Bl. Each output pulse of the circuit OR 29 opens the transistor switch of the circuit 28, removing the remagnetization of the core of the circuit 28 again to the initial state - 5. The reading reading Uc is selected in such a way as to ensure the duration of the core emulsion, ravia 0.1 7.v ,. The shaper 16 generates a sequence of 9 pulses with a duration of 0.1 T, -, and with a repetition period H 1.1 G, which arrives at the input of the soviata circuit 13 and the pulse input of the vernier key 14. The pulses of the nonius neorod through the open nonius key 14 arrive at the counter 15 of an additional bit, as long as the circuit 13 coincides, while simultaneously pushing at its inputs the pulses of the measured and vernier frequencies do not close the vernier key 14. At the same time, "1 pulses of the vernier sequence is recorded in the counter 15. The conductor passing through the circuit 13 and the pulse goes to the power supply unit 30, which by the influence of this pulse for some time T / 1 dramatically increases the supply to the read windings of circuits 19-28, as a result of which the remaining "unused pulses of the first nonius sequence occur very fast. At the end of time 4, new readout readouts are installed at the output of the power supply: instead of Uc, Uc is set, and instead of and c, the voltage is set and. The same impulse from the output of the soviadena circuit 13 through the delay element 31 with the delay time of 4 is received on the control unit 1, the s input of the selector 11 of the neyrode and, affecting it, allows the formation of another interval equal to Tx. Under the influence of a pulse from the output of the selector 11, the duration of the period of the measured frequency in the driver circuit occurs again. The former 16 is in this state until the second light appears and the divider 9 exits. Under the influence of this pulse, the trigger 10 closes the key 2 and sends a signal to the key 8, locking it. Simultaneously, the impulse from the output of the divider 9 opens the key 14 and enters the form-distributor 16, causing the formation of the second impulse sequence from nine nonius emuls. and c, is selected in such a way that the duration of the output pulses of the circuits 19-27 and Uc provides for equal 0.9

pulse output with a duration of 0.1 Gd.

The pulses of the second sequence through the key 14 are fed to the counter 15 of an additional bit until the circuit 13 coincides with the simultaneous arrival of the measured and vernier frequency pulses at its input and closes the vernier key 14. At the same time, the counter 15 of the vernier sequence is recorded in the counter 15.

The number n, fixed in block 4, is equal to

D + 0.1 ("1 +" g): / d ;, G ".

If the sum exceeds 10, then the tenth pulse of this sum transfers the counter 15 to the zero state and enters the input of the counter 3.

Claims (1)

Invention Formula Digital frequency meter and electric frequency ratio. oscillations, containing the input pulse shaper, the output of which is connected through the period selector of the measured frequency to the first input of the shaper of a sequence of pulses of the vernial frequency formed by two keys, ten magnetic integrated circuits, an OR logic circuit, and a power supply an input of the vernier reference circuit of the additional bit, a (developed by a coincidence circuit, a vernier key and an additional bit counter, and is connected to the first input of the main key, the output of which is It is connected with the first input of the main counter, the second input - with the output of the generator of the time measurement interval formed by the generator 0 reference frequency, switch, TLE. a pulse frequency divider and a trigger, characterized in that, in order to increase speed and simplify the device, in it the output of the selector period of the measured frequency is connected to the input of the key of the temporal measuring time interval, the trigger start input of the selector the reference circuit of the additional discharge and with the input I will install one of the two possible conversion factors of the driver of the sequence of the pulse of the Vernier frequency, the start input to torogo connected to the potential input no5 niusnogo key and the output of the frequency divider, wherein the additional bit output of the counter and connected to the second input of the main counter.