SU661420A1 - Meter of relative error of scale converters - Google Patents

Description

staff converter and input controlled converter. FIG. 1 shows the functional scheme of the device; in fig. 2 voltage diagrams at the outlet of the regenerative links. The device contains a high-frequency oscillator 1, an adjustable voltage divider 2, a controlled scale converter 3, an exemplary scale converter 4, a switch 5, a switching frequency generator 6, a selective amplifier /, an amplitude detector 8, a low-pass filter U, a differential amplifier 10, a reference source voltages 11; b - power oscillation of switching frequency 12; phase-sensitive rectifier 13; and indicator 14.. The device works as follows. supply voltage U, frequency w from generator 1 through voltage divider 2 with transfer coefficient K is fed to controlled and exemplary scale converters 3 and 4. Conversion coefficient KQ of converter -F is set equal to the nominal value of coefficient to converter 3. When the transfer coefficient of converter 3 deviates nominal value. .. (KX KH) amplitudes of output voltages Ug and and. converters 3 and 4 are also not equal (Fig. 2). The frequency L of the generator b was chosen significantly smaller than the frequency w of the power generator 1 (L “oe). During the continuous operation of the switch 5, the voltage amplifier 7 tuned to the frequency (l) passes the packets TO THE STRESS | and U and the second form a single amplitude modulated voltage U5 (Fig 2). This voltage is rectified by an amplitude, for example, full-wave detector 8 (Ug). In a flattened voltage Ug, the output of the filter 9 has two voltage components: a constant Uy and a variable that varies with the switching frequency L. The delivered component of the voltage is fed to the input of amplifier 10 and is determined by the following expression: 11e + i4 t1 AT K7KaK9 2 gle Kf, Ka and Ko are the transfer factors of amplifier 7, detector 8 and filter 9, respectively, to the other input amplifier 10 A constant DC voltage U CDnst from the voltage source 11. After amplification, the differential voltage equal to Uio Kjo (- U) is fed to the control input of the divider 2. The polarity of the differential voltage Ujo is chosen so that 04 I -.ni and, | and Up at the inputs of amplifier 10 were equal. Since the voltage at the inputs of converters 3 and 4 is proportional to the transfer ratio of voltage divider 2 (Uj K2Uj), tc from the equation, K, KgK, 2 1 it follows that the transfer ratio of splitter 2 is automatically set equal. (Q / C) and AC voltage at the output of the filter 9 (Determined by: K8K9 After amplification in amplifier 12, the frequency voltage L is rectified by a phase-sensitive rectifier 13. You: direct voltage is measured by indicator 14 VK UV where K and K | j are the gear ratios of amplifier 12 and rectifier 13. Considering: the transmission coefficient K of divider 2, we have the output voltage of the indicator in the form V.2.Ur. lu are little different from each other KX-KH p. II- - Thus, the output voltage, taking into account Hv const is proportional to the measured error Vo, .x.3yA-Ky, .. The indicator does not depend on the fluctuations of the supply voltage U and the instability of the transmission coefficients of the selective amplifier, detector, and filter. By using a calibrated reference voltage source with a step divider at the output, it is possible to measure the relative balance of scale converters from hundredths to a few percent on a single scale or digital display. Ater.

invention formula

A relative error meter for scale converters containing a high-frequency oscillator, a voltage divider, input and output terminals of a monitored scale converter, an exemplary large-scale converter and a switch, the first input of which is connected to the reference scale converter, and the second with the output terminal of a controlled scale converter, and the switch output through a series-connected selective amplifier, amplitude detector, low-pass filter and The switching voltage amplifier is connected to one of the inputs of the phase-sensitive rectifier, the other input of which is connected to the output of the switching frequency generator and to the control input of the switch, and the output of the phase-sensitive rectifier is connected

with an indicator characterized in that, in order to expand the functionality and increase the measurement accuracy, a differential amplifier and a reference voltage source are introduced into it, and

One input of the differential amplifier is connected to the output of the low-pass filter, and the other input is connected to the output of the reference voltage source, while the output of the differential amplifier is connected to the control input of a voltage divider made adjustable, whose input is connected to the output of the high-frequency oscillator, and the output -. with an input of an exemplary scale converter and the input terminal of a controlled converter.

Sources of information taken into account in the examination

IjAuthorial certificate of the USSR No. 219010, MKI 01 T 19/10, 26.10.66.

661420