SU1078341A1 - Time delay meter having stroboscopic signal indication - Google Patents

Abstract

1. TIMER-DELAY METER WITH STROBOSCOPIC INDI SIGNAL SIGNAL, containing a scale voltage sensor, the first input of which is connected to the output of the reference voltage sensor, and the output to the first input of the comparator unit, the second input of which is connected to the output of the fast sawtooth generator, and the output - with the second input of the stroboscopic converter, the first input of which is connected to the signal line, and the output - to the input of the channel of the vertical deflection of the oscillographic indication unit, the input of the channel is horizontal The maximum deviation of the voltage is connected to the output of the slow sawtooth generator, which is characterized by the fact that, in order to improve the measurement accuracy, it is equipped with a reference voltage source controlled by the slow saw voltage level sensor, digital display unit, two pushbutton switches and a control pulse generator, the output of which is connected to the input of a fast sawtooth voltage generator, the second inputs of a controlled slow level saw voltage sensor and a generator Ora of a slow sawtooth voltage, through the first pushbutton switch with VTORSh4I sensor inputs of the reference voltage and digital display unit and through the second pushbutton switch with the first input of the digital indication unit and the third input of the reference voltage sensor, the first input of which is connected to the output-from the reference source voltage, the first input of the slow pylor voltage generator and the first input of the controlled sensor of the level of the slow saw voltage, connected to the second input, Atchik support voltage.

Description

2. Pop-1 meter, characterized in that the reference voltage sensor consists of a reversible binary impulse counter and a digital-analog converter, the reference voltage input of which is connected to the first input of the reference voltage sensor, the output voltage of the reference voltage sensor,

and a digital input with a digital output of a reversible binary pulse counter, whose addition and subtraction inputs are connected to the second and third inputs of the reference voltage sensor.

3. Pop-1 meter, characterized in that the controlled level sensor of a slow sawtooth voltage consists of a pulse frequency divider with a switchable division factor, a binary pulse meter and a digital-analog converter, a digital input connected to a digital output of a binary pulse counter, a digital input of which connected to the output of a pulse frequency divider with a switchable division factor, the input connected to the second input of a controlled level sensor of a slow saw shaped voltage, the first input coupled to an input reference voltage tsif1eoanalogovogo converter, and output - with output DAC.

The invention relates to electrical measuring technology and can be used in the development of pulse reflectors and stroboscopic meters.

A time delay meter with a stroboscopic signal indication is known, comprising fast and slow sawtooth voltage generators, a comparison unit, a stroboscopic converter and an oscillographic indication unit ij.

The disadvantage of the device is low measurement accuracy.

The closest to the invention to the technical essence is a time delay meter with a stroboscopic signal indication, containing a scale voltage sensor, the first input of which is connected to the output of the reference voltage sensor, and the output is connected to the first input of the comparison unit, the second input of which is connected to the output of the generator a fast sawtooth voltage, and the output with the second input of the stroboscopic converter, the first input of which is connected to the signal line, and the output to the input of the vertical deflection channel b oscillographic indication locus, the input of the horizontal deviation channel of which is connected to the output of the slow sawtooth generator and the second input of the scale voltage sensor

A disadvantage of the known device is the low measurement accuracy due to the temperature and temporal instability of two independent sources of reference voltage.

The purpose of the invention is to improve the measurement accuracy.

This goal is achieved by the fact that a time delay meter with a stroboscopic signal indication,

the voltage sensor contains a scale, ba, the first input of which is connected to the output of the voltage sensor, and the output is connected to the first input of the unit

Comparison, the second input of which is connected to the output of the fast sawtooth generator, and the output to the second input of the stroboscopic converter, the first input of which is connected to the signal line, and the output to the input of the channel of the vertical deviation of the oscillographic indication unit, the input of the channel of horizontal deviation of which is connected to the output of a slow sawtooth voltage generator, supplied with a reference voltage source controlled by a slow saw voltage level sensor, block digit oic display, two push-button switches of the generator and the control pulses, the output of which is connected to the input of the sawtooth generator rapid voltage controlled second inputs

0 level sensor of slow sawtooth voltage and honey generator, fallen sawtooth voltage, through the first push-button switch with the second inputs

5 of the sensor of the reference voltage and the digital display unit and through the second pushbutton switch with the first input of the digital indication unit and the third input of the sensor of the reference voltage, the first input of which is connected to the output of the reference voltage source, the first input of the slow sawtooth generator and the first the input of a controlled sensor of the level of a slow sawtooth voltage, an output connected to the second input of the reference voltage sensor. Moreover, the reference voltage sensor consists of a reversible binary pulse counter and a D / A converter, the reference voltage input of which is connected to the first input of the reference voltage sensor, the output is connected to the output of the reference voltage sensor, and the digital input is connected to the digital output of the reverse binary a pulse counter, the addition and subtraction inputs of which are connected to the second and third inputs of the reference voltage sensor. In addition, the controlled slow level sawtooth sensor consists of a pulse frequency divider with a switchable division factor, a binary pulse counter and a digital-to-analog converter, a digital input connected to a digital output of a binary pulse counter, the digital input of which is connected to the output of a divider. pulse frequency with a switchable division factor, the input connected to the second IO. The controllable level sensor of the slow sawtooth voltage is the first input coupled to the input reference voltage tsifroanalog ovogo converter, and output - with output transducer roanalogovogo Dig. FIG. 1 shows a structural electrical circuit of the device; in fig. 2 is a structural electrical circuit of the voltage sensor; in fig. 3 - the same, controlled by the sensor level slow sawing voltage; in fig. 4 time diagrams of voltages at the outputs of individual blocks. The device consists of a reference voltage sensor 1 (DON), a slow sawtooth voltage generator 2 (MPN), an oscillographic display unit 3, a scale voltage sensor 4 (DIM), a fast saw voltage generator (BPN) 5, a block Comparison, stroboscopic converter 7, reference voltage source 8, controllable sensor 9 for slow sawtooth voltage level (UDF) / generator 10 control pulses, digital display unit 11 and pushbutton switches (buttons) 12 and 13. DON 1 consists of reverse g a pulse counter 14 pulses and a digital-to-analog converter 15. A UDU MPN consists of a frequency divider 16 with a switchable division factor, a binary counter 17 pulses and a digital-analog converter 18. The first input of DNM 4 is connected to the output of DON 1, and the output is connected to the first input of block 6 compare, the second input is connected to the output of the BPN generator 5, and the output is connected to the second input of the CTpo6ocKonH4ecKpfo converter 7, the first input of which is connected to the signal line, and the output to the channel input of the vertical deflection of unit 3 by oscillographic display ation, the horizontal deflection input channel is connected to the output of the generator 2 PHM. The output of the generator 10 control pulses is connected to the input of the generator 5 BPN, the second inputs of the UDU MPN 9 and the generator 2 MPN, through the first pushbutton switch 12 with the second inputs DON 1 and the digital display unit 11 and through the second pushbutton switch 13 with the first input of the unit 11 digital display and the third input DON 1, the first input of which is connected to the output of the source 8 of the reference voltage, the first input of the generator 2 MPN and the first input of the UDU MPN 9, the output connected to the second input of DON 1. The input voltage of the digital-to-analog conversion the capacitor 15 is connected to the first input DON 1, the output to the output DON 1, and the digital input to the digital output of the reversible binary counter 14 pulses, the addition and subtraction inputs of which are connected to the second and third inputs DON 1. The digital input of the digital-analog converter 18 is connected to a digital output of a binary pulse counter 17, the digital input of which is connected to the output of the pulse frequency divider 16 with a switchable division factor, the input connected to the second input of the UDU MPN 9, the first input of which is connected to the reference input The voltage of the digital-to-analog converter is 18, and the output is with the output of a digital-to-digital converter 18. The device operates as follows. The generator 10 control pulses generates rectangular pulses with a period Tg (Fig. 4a). The reference voltage source 8 provides a voltage and a dd, which is a reference simultaneously for DON 1 for a UDU MPN 9- and a 2 MPN generator. The 2 MPN generator produces a sweep voltage for the oscillographic display unit 3 by counting the pulses of the generator 10 control pulses and converting them to the corresponding output voltage. The increase in the output voltage of the generator 2 MLN is carried out. stepwise, one step per cycle. Tr. The duration of the stepped MLN of the sweep is determined from the expansion of Tg – 3, where N is the number of bits of the binary counter of the generator 2 MLN. The amplitude of the stepped MLN is equal to and, DON gives the calibrated voltage set on the ra- tor (Fig, 46). P and, taA whose setting range lies in the range from O to u, 5, d (when changing p from O to 1) The output voltage of DON 1 is changed by pressing buttons 12 and 13. And when you press button 12, the reversible counter is 14 p It boosts the addition and output voltage DON 1 increases, and when you press button 13, it decreases. At the same time, the output voltage DON 1 can be expressed as follows 1 - I and K - 2N 910. where m is the number of pulses that are dried by a reversible binary counter 14. The UDU of the JNP 9 produces a stepped MN comparison (Fig. 4 in 1, the duration of which is equal to the sweep. The difference between this voltage and the output voltage of the generator can be one is changed by switching the dividing factor (-j-) of the frequency divider 16, and the second is amplitude. The amplitude of the output voltage UDU MLN 9 is determined by the expression Uq Ug-ra K, Operator, changing the dividing factor 16 of the frequency divider, changing em p The observed reflectogram on the screen of unit 3 is set. MPN 9. The output voltage diagram of DNM 4 is shown in Fig. 4d. The BPN 5 generator is started by means of pulses from the generator 10 control pulses and produces pulses of a linear, fast-growing sawtooth voltage (Fig. 4e). The comparison block compares the BPN with a stepped MLN of comparison (Fig. And, at the time of their equality, produces pulses (Fig.), Which trigger the strobe pulse generator, which is part of the stroboscopic converter 7, and the Second input receives signals from the signal line. Converter 7 is fed to the input channel of the vertical deviation of the oscillographic display unit 3. The digital display unit 11, which is a series connection of the reversible binary decimal counter, decoder and digital indicator, counts the number of pulses w, sukaadnymi reversible binary counter 14 of the sensor of the reference voltage, and indicates the number of them.Thus, the variable calibrated delay by changing the output voltage of the sensor 1 reference voltage, oper. / p, measures the time delay, which is indicated on the digital indicator of block 11, in units of time, since the number of bits of binary counters DON 1, UDU MLN 9 and generator 2 MLN are equal and the reference voltages on vxodak guides said blocks are equal, the condition for the coupling - equality voltage corresponding to the limit m -value calibrated delay time and scan time, over the screen is provided automatically. Calibration is carried out by setting the reference voltage U ,. the reference voltage source on the indicator scale when the calibration strobes are applied to the second input of the stroboscopic converter. The proposed device allows to simplify the measurement process, since it is not necessary to calculate the measured value taking into account the scale factor of the reading device and the scale factor of the indicator. The proposed device makes it possible to increase the accuracy of measuring the time delay by using a single reference voltage both for generating a calibrated reference voltage and for generating MLN, as well as fulfilling the conjugation condition. By lyricism, the conjugation condition is fulfilled in any case, even under the influence of destabilizing factors. The law of changing the voltage value of the comparison under the influence of destabilizing factors repeats the law of change of the reference voltage. These changes can be taken into account to achieve high measurement accuracy when exposed to destabilizing factors.

Claims (3)

1. TIME DELAY METER WITH STROBOSCOPIC SIGNAL INDICATION, comprising a scale voltage sensor, the first input of which is connected to the output of the reference voltage sensor, and the output with the first input of the comparison unit, the second input of which is connected to the output of the fast sawtooth generator, and the output - with the second input a stroboscopic transducer, the first input of which is connected to the signal line, and the output to the input of the channel of the vertical deviation of the oscilloscope display unit, the channel input is horizontal from lounging of which is connected to the output of the slow sawtooth voltage generator, characterized by the fact that, in order to increase the measurement accuracy, it is equipped with a reference voltage source controlled by a slow sawtooth voltage level sensor, a digital display unit, two push-button switches and a control pulse generator, the output of which connected to the input of a fast sawtooth generator, the second inputs of a controlled level sensor of a slow sawtooth voltage and a slow generator about sawtooth voltage, through the first push-button switch with the second inputs of the reference voltage sensor and the digital n / a display unit and through the second push-button switch with the first input of the digital display unit and the third input I of the reference voltage sensor, the first g input of which is connected to output from a reference voltage source, the first input of a slow sawtooth voltage generator and the first input of a controlled slow sawtooth level sensor, the output connected to the second input of a support sensor voltage. f S ---- »f 2. The meter according to claim 1, characterized in that the reference voltage sensor consists of a reversible binary pulse counter and a digital-to-analog converter, the reference voltage input of which is connected to the first input of the reference voltage sensor, the output is connected to the output of the reference voltage sensor, and the digital input is connected to digital output of a reversible binary pulse counter, the addition and subtraction of which are connected to the second and third inputs of the reference voltage sensor. 3. The meter according to claim 1, characterized in that the controllable level sensor of the slow saw-shaped voltage consists of a pulse repetition rate divider with a switchable division factor, a binary pulse counter and a digital-to-analog converter, with a digital input connected to the digital output of a binary pulse counter, the digital input of which connected to the output of the pulse repetition rate divider with a switchable division coefficient, the input associated with the second input of the controlled level sensor of the slow saw phase voltage, the first input of which is connected to the input of the reference voltage of the digital-to-analog converter, and the output to the output of the digital-to-analog converter.