SU571765A1 - Frequency meter - Google Patents

Description

I

The device relates to a 9 spectroelectric technique.

Known frequency counter containing a driver, a key, a BpeNHsaflaromee device, an integrating device and an indicator f 1.

However, this device provides an improper voltage proportional to the period of the measured infrared frequency: and not. suitable for the result of the result in units, frequency,

. Closest to the proposed frequency of infra-low electric Eolebavy containing an amplifier-limiter, asymmetrical trigger, one-shot, keys, generator with independent remembering, a differentiating chain and a block of reciprocal 2 j.

However, the known device has insufficient speed,

The purpose of the invention is to improve the accuracy and speed of receiving the output voltage, proportional to the value of the input frequency,

A predetermined circuit is achieved by the fact that the adder, subtractor, and the multiplication unit are entered into the frequency counter containing the conversion unit often to the time interval, which is connected to the control inputs of the sawtooth voltage circuit breaker and key. One input is connected to the output of the addition unit and to the first input of the subtraction, and the second input of the multiplication device is connected to the output of the voltage generator, and the output j of the multiplication device is connected to the second input of the subtraction unit, the output of which is connected to the output of the multiplication device Key; the second input of the key is connected to the second input of the generator with a voltage of ten.

The drawing shows a Structural Frequency Chart.

The device consists of taking frequency conversion 1 into time interval, key 2, sawtooth generator 3, block 4, subtractor 5 and multiplying device

Claims (2)

The input signal is fed to block 1. In the initial state, key 2 is closed. The trigger 3 starts generator 3, and at time Pt t (f; (- input signal frequency), key 2 is opened, through which the reference voltage U is fed to the unit Voltage Uj {() at the output of generator 3 changes during per orape according to the linear law, when the voltage of the input voltage is 1 / o f COMst. Usft | - Uc (k, t. (i) raeUj (t) is the tick value of the output voltage of the generator 3; ((tvkushev integration time Voltage Ujft) is fed to the multiplication device 6, to the other input of which voltage Ui is applied, (tj from block 4 Voltage O (O at the output of the device and b is defined by the expression Ueft / -KgU, u / 4fo {2) The voltage Ueftl from the device b is fed to the input of the subtraction unit 5, the second input of which receives the voltage X) (t) from the 1 addition block 4. For example, Uj / t ) and the output of block 5 is defined by the expression, (Ul / e (t | This voltage is applied to the second input of block 4, for which it is not necessary that l4 (t | -U, Us (t) (4) subject to equations ( 1), (2), (G) u, (. (T | -Ue / t; / i4 / i) M, kaU3 {t; -4 (,) - t (5) Uo U.RC RC to - ky-lЧkJ- 5 4 To the end of each period Tj of the oscillations of the input signal, the initial voltage,%, Tx,.,. where jx is the frequency of the input signal. This device reproduces the inverse dependence of the output voltage on the time interval Tx, Formula of the Invention A frequency meter containing a block has been converted to a frequency in a time interval whose output is connected to the control inputs of the saw voltage voltage generator, which is different in purpose the accuracy and speed of obtaining output-voltage, proportional to the value of the input frequency, & an addendum block is entered, a subtraction unit is entered into the multiplication unit, one input of which is connected to the output of the addition block and the first input of the subtraction unit, the second input of the multiplication device is connected to the output of the sawtooth generator, and the output of the multiplication device is the output of which is connected through the addition unit to the output of the key, while the second input of the key is connected to the BTOfbiM input of the saw-tooth generator. Sources of information taken into account in the examination: 1. US patent number 3801906, cl. 324780, 23. 01.73. 2. USSR Author's Certificate No. 9999944, 01 (23/10, 11.O1.64.