SU978062A1 - Device for measuring two pulse train average counting rate ratio - Google Patents

Description

The invention relates to devices for measuring the ratio of average counting rates of two pulsed streams and can be used in automation and measurement technology.

A device is known for measuring the ratio of average count rates of two pulsed streams containing two channels, each of which consists of serially connected AND logic, a counter and a trigger, which are connected to a control unit, the counter outputs are connected via a multi-channel switch to an output of device 1.

The disadvantages of this device include the impossibility of obtaining a continuous reference in time; information on measurable relationships.

Closest to the invention is a device for measuring the ratio of average counting rates of two pulse streams, comprising a code-to-analog converter and a C2 reversible counter.

However, in this device it is impossible to obtain high performance when expanding the dynamic range: on the measured ratios, since, to increase the accuracy of measuring the ratio and expand the dynamic range of the measured ratios, it is necessary to increase the recalculation coefficient K., which in turn leads to an increase in the measurement time Tj, 3M, which is determined at the minimum average counting rate of the pulses of the dividend, followed by

N,

.with.

I

is max

 H-1

- average count rate imgde Pd pulses divider; average count rate of the dividend pulses; coefficient of recalculation; Np.tj- reversible counter volume.

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

The goal is achieved in that a device for measuring the relative average counting rates of two pulses, containing a code-analog converter and a counter, the outputs of which are connected to the code-analog converter inputs, a comparator unit, a driver and an integrator are inserted, the counting counter input being connected to the first input bus of the device, and R the input of the counter is connected to the output of the driver and the output bus of the device, the input of the integrator is connected to the second input bus of the device, and the output of the integrator is connected to Valid ervomu comparing unit, a second input coupled to an output of the code converter-analog comparator block output being coupled to an input of the.

The drawing shows a block diagram of the device.

A device for measuring the ratio of average counting rates of two pulsed streams contains a code-analog connected in series 1 and a counterpart converter 2, the counter input of counter 1 being connected to the first input bus of the dividend device, as well as integrator 3, comparison unit 4 and pulse shaper 5. Moreover, the input of the integrator 3 is connected to the second input bus input of the device separator, the output of the integrator 3 is connected to the first input of the comparator unit 4, the second input of which is connected to the output of the converter 2 code-analogue, the 3rd output of the comparator 4 through the driver 5. The R-input of the counter 1 (setting of the counter 1 to the state O) and with the output bus of the device. The device operates as follows.

To the counting input of counter 1 is a statistically distributed pulse flow divisible at Average speed, counts m. Through the converter 2, a code-analogue number written in counter 1 is converted into a DC voltage, which by the moment of time -t

and Kk-dp: the conversion function of the average count rate n of the pulsed flow of the divider, i.e., U K c n, where K is the transformation coefficient of the integrator 3. ,,

At the moment (t T) of the equality of the stresses and and and at the output of the comparison unit 4:% a pulse, which is fed through the driver 5 to the R input of the counter 1 and is the output signal of the device, after which the described process repeats.

Wherein

 .ch ° and 2

where T is the time from the beginning of the cycle of operation of the device until the operation of block 4 of comparison,

1 KK-A Ph

P

T K14P2

Thus, the average count rate of the output pulse stream n is proportional to the ratio of the average count rates of the input pulse streams.

The performance of the proposed device is determined only by the constant time of the integrator and will be K times higher than the speed of the known device.

Claims (2)

1. USSR author's certificate №470756, cl. G 01 R 23/00, 1975. 2. USSR author's certificate number 310188, cl. G 01 R 23/00, 1971 (prototype).