SU737899A1 - Device for automatic measuring of statistical characteristics of digital instrument random errors - Google Patents

Description

(54) DEVICE FOR AUTOMATIC MEASUREMENT OF STATISTICAL CHARACTERISTICS OF S.L1-PARTICULAR ERRORS OF DIGITAL INSTRUMENTS

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The invention relates to the field of automated information measuring systems for controlling digital devices and can be used, in particular, to determine the probability density function of the random errors of digital devices with time-to-pulse conversion for any couplings; x between the standard deviation of random errors and the quantization step,

A device known to automatically measure the statistics of the random characteristics of digital devices, containing a source of exemplary controlled voltage, an output connected to the input of a digital device under investigation, a digital subtractor, an output connected to a code comparison circuit, and an input through a code converter - with the input of the investigated digital device. This device does not allow to measure the statistical characteristics of random errors of digital devices with a standard deviation of random values less than quantization step II.

It is also known a device for automatic measurement of statistical hryractic random errors of digital devices containing a digital device under study, the measuring input of which is connected to the output of a source of a sample signal, an arithmetic device, an output connected to the input of the classifier of codes, the output of which is connected to the input of the registration unit, and the control unit, the first and the second output of the coupled one, respectively, are connected with the input of the source of the exemplary signal and the start input of the investigated digit ovogo device 2,

However, this device has low accuracy, due to the offset of the output signal of the studied

2U of a digital device at the transition boundary between 1 neighbor 1 quanta and dependence on the step of discreteness of the source of exemplary signals,

The purpose of the invention is to increase the accuracy of measurement of static values of random errors of digital devices,.

The goal is achieved by the fact that a device contained in a digital device, measuring

The output is connected to the output: a single signal, an arithmetic setup, an output connection with the input of the code classifier, the output of which is connected to the input of the registration unit, and the control unit, the first and the second outputs of which are connected respectively to the input of the sample source and the trigger input Inexpensive digital device, additionally introduced three counters /, pulse generator, dafetor zero, logic AND, KOivsviyTarbp codes and two delay elements, and the enable input of the first counter p Connected to the output of the ogic element and permitting the inputs of the second and third counters are combined with the input of the first element aayerysk, nejEiBHM Logical input p6 element nt a And art station art opchm vygssodbm: studied digital. counting INPUT the first counter, whose input is connected to the detector zero input, the output connected to the second drive: the delay element, the second logical element AND the second count input, and the second and third inputs: 0 sStr. confused with:;:: impulses, sbrb. with the second output of the first delay element, the first output of which. with nejJBHM; the input of the switch is the codec, the second, and the fourth (inputs connected to the Syodas) and the second and third counters and the second one is the delay and the output of the ptf switch is the middle with the first input of the device, the Second input of KoTujpioro is connected to the information input. and the third output of the block. management

N $ The drawing is a structural diagram (Devices,; ... / l; device for automatic, measuring the static characteristics of random errors of digital devices contains a source of 1 exemplary signal, the digital device under investigation 2 /, the logical element I 3,. 4 pulses, control unit 5,; first counter b, detector 7,: second; th counter 8, third counter 9, second delay element 10, switch AND codes, first delay element 12 (, arithmetic unit 13 classifier 14 codes and registering 15.

The device works as follows.

From the first output of the control unit 5 to the input of the source 1 of the reference signal is received, the code m + z corresponding to the controlled point of the measurement range of the digital device under study 2. At the output of the source about 1 sample of the reference signal 1 after

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In addition, a signal is generated which responds to the monitored point and is available at the measuring input of the device under study 2.

From the third output of control block 5, a code corresponding to, for example, the numbers 10, -100 and 1000, comes to the information input of the first counter b and the second input of the arithmetic unit 13,

After the time required to establish an exemplary signal at the input of the digital device 2 under investigation, a trigger pulse arrives from the second control unit 5 at the start input of the digital device 2 under study.

The digital device under study 2 measures and generates, from the start-stop output, a signal corresponding to the measurement period, which is fed to the first input of the logical element I 3, the input of the first delay element 12 and the enabling inputs of the second and third counters 8 and 9..

The logical element AND 3 switches, allowing its output to receive the first counter of the quantization pulses of the digital device under investigation 2,

The first counter b starts working on the subtraction. At the same time, the counting inputs of the second and third counters 8 and 9 begin to receive pulses from the output of the generator 4 pulses, the frequency of which is higher than the frequency of the quantizer of the digital device 2 under study.

After subtracting the number of pulses from the first counter b m, a code O is formed at its output, which is detected by the detector 7 zero. At the detector zero output, a signal is generated, which is fed to the input of the second Counter 8, the second input to the logical element 3 and the input to the second delay element 10,

After that, the operation of the second counter 8, in which the code of the k-number of pulses is written, is stopped. the initial state switches the IZ logical element, prohibiting with its output the further operation of the first counter b. The same signal, arriving at the input of the delay element 10, is delayed by the time required to establish the second counter 8, and then goes to the fourth input of the 1G switch allowing the translation of indications of the code of the second counter 8 to the first input of the arithmetic unit-13. In the arithmetic unit 13, the coefficient a is calculated.

At the end of the signal from the start-stop output, the operation of the third counter 9 stops and the code N is fixed in it, corresponding to the period

measurement of the digital device under investigation 2..

After finishing the work of the third counter 9c of the first output of the element

12 delay to the first input of the commutator .11 codes comes a signal allowing the receipt of the code to the first input of the arithmetic unit 13.

After the arrival of the N.N. code, the arithmetic unit 13, from the second output of the first delay element 12, receives a signal on the reset buses of the second and third counters 8 and 9, producing an IM reset.

Thus, counters 6.8 and 9 will be in the initial state. Simultaneously in the arithmetic unit

13, a calculation of a measurement result equal to b, is made, which at the end of the calculation is received

in the classifier codes 14.

Further, in a similar manner, n measurements are performed at a controlled point of the measurement range of the digital device under investigation 2.

The results of the measurements of C, L, ..., L obtained in this way are recorded in the classifier 14 codes in order of increasing, with a corresponding fixation of the probability P (1 :) of their occurrence, after which they enter the recording device 15, in which their documentation in the form of a series of distributions or histograms of the density function of random errors.

The device makes it possible to measure the probability density function with any accuracy, which will depend on the correlation between the magnitudes of the random component and the frequency of the pulse generator.

Claims (1)

1. USSR author's certificate I 3990S9, cl. H 03 K 13/02, 1973. 2, Copyright. Certificate of the USSR 50 No. 319065, cl. H 13 K 13 / 02,1971 (prototype). . .