SU845128A1 - Dc voltage calibrator - Google Patents

Description

The invention relates to electrical engineering and can be used in various automated devices, for example, in universal, versatile programmable calibration complexes of direct and alternating current.

Known voltage calibrators' using inductive dividers Щ. The disadvantages of these calibrators are the complexity and low accuracy of calibration.

Also known are direct-current calibrators using direct-current and direct-voltage converters containing 1 standard rectangular voltage source, a multi-decade inductive voltage divider, an electronic switch, a storage capacitor and a direct current amplifier L 2]. Its disadvantage is its low accuracy of calibration, due to the distortion of the shape of the rectangular voltage after passing through the inductive divider, - the appearance of fluctuations on the vert-2 bus and the decline of its shallow part.

The purpose of the invention is to improve the accuracy of voltage calibration.

This goal is achieved in that the calibrator containing a rectangular voltage source 3, a multi-decade inductive voltage divider, an electronic switch, a storage capacitor and a DC amplifier, is equipped with a pulse top former in the form of an excitation winding connected to the additional output of the rectangular voltage source, introduced in the senior decade of the divider , and an electronic key control circuitry connected to the output of the square voltage source.

In FIG. 1 shows a diagram of a calibrator; in FIG. 2 is an electronic key management circuit.

The calibrator contains an exemplary rectangular voltage source 1 with outputs 2 and 3, a multi-decade inductive voltage divider 4 (the highest decade of which 5, in addition to the dividing winding 6, contains an additional excitation winding 7), the youngest decade 8, an electronic switch 9, a capacitor 10, a constant amplifier current 11 and the circuit 12 control electronic key.

The electronic key control circuit includes a first differential circuit 13, a transformer amplifier 14, a first one-shot 15, an inverter 16, a second differentiator circuit 17, a second one-shot 18 and an electronic amplifier 19.

The DC voltage calibrator operates as follows.

Exemplary source of AC rectangular _ 1 voltage transformation ^e zuet known DC voltage into a rectangular alternating voltage exemplary. E, then the voltage goes to the input of a multi-decade inductive · voltage divider 4 and is divided by the required number η times.

The electronic key 9 is turned on and off at strictly defined points in time, which is provided by the control signals of the device of control 15 of 12. 12. · ·

The key management circuit works as follows .. The signal from the output of the exemplary source 1 of an alternating rectangular voltage is supplied to a differentiating circuit 13. Then these pulses are amplified by a transformer amplifier 14, inverted 'and fed to the input of a single-shot 15. The output voltage pulses of a rectangular shape are obtained . Further, these pulses are subjected to logical inversion by the inverter 16 and are differentiated by a differentiating circuit 17. In this case, the trailing edge of the differentiated pulses is used to start one-30 vibrator 18. A rectangular voltage is formed at its output. These pulses, after amplification by an electronic amplifier 19, are used to start the control device of the electronic key 9. Due to the synchronization of the key operation, the pulses form a rectangular pulse, on which the output voltage level remains constant.

Owing to this, the voltage level at the capacitor 10 and the steady state operating mode can be brought to the output level of a reference source of variable rectangular voltage, divided η times by an inductive voltage divider 4.

Further, the voltage across the capacitor 10 is transmitted to the output of the voltage calibrator through an amplifier 11, which is a precision voltage follower (for example, with field-effect transistors at the input, with a transmission coefficient close to unity), which practically does not distort the value set by the voltage divider.

Claims (2)

The invention relates to electrical measuring equipment and can be used in various automated devices, for example, in universal programmable calibration complexes of direct and alternating current. Voltage calibrators are known with the use of inductive dividers. The disadvantages of these calibrators are complexity and low calibration accuracy. Also known are calibrators of direct voltage using converters of direct voltage to alternating and vice versa, containing an exemplary source of rectangular voltage, a multi-decade inductive voltage divider, electronic key, storage capacitor, and a DC amplifier 1. the calibration accuracy is low due to the distortion of the shape of the rectangular voltage after passing through the inductive divider — the occurrence of fluctuations on the tire and the decline of its flat part. The purpose of the invention is to improve the accuracy of voltage calibration. The goal is achieved by the fact that the calibrator, containing a rectangular voltage source, a multi-decade inductive voltage divider, an electronic switch, a storage capacitor and a DC amplifier, is equipped with a pulse topper as connected to the auxiliary output of the rectangular voltage source, introduced in the senior decade of the divider, and an electronic key control circuit connected to the output of the rectangular voltage source. FIG. 1 shows a diagram of the calibrator; in fig. 2 is an electronic key management circuit. The calibrator contains an exemplary, rectangular voltage source 1 with outputs 2 and 3, a multi-decade inductive voltage divider 4 decade 5 of which, except. The separating winding 6 contains an additional excitation winding 7), the youngest decade 8, an electronic switch 9, a capacitor 10, a DC amplifier 11, and an electronic switch control circuit 12. The control circuit of the electronic key contains the first differential circuit 13, the transformer amplifier 14, the first one-oscillator 15, the inverter 16, the second differentiating circuit 17, the second one-oscillator 18 and the electronic amplifier 19. The calibrator of DC voltages operates as follows. An exemplary source of alternating rectangular voltage 1 converts a known constant voltage into an exemplary variable positive voltage. E, then the voltage is fed to the input of a decade-long inductive voltage divider 4 and divided by the required number n times. The electronic key 9 is turned on and off at certain points in time, which is provided by control signals, the control device 12. The key control circuit works as follows. The signal from the output of the exemplary source 1 of alternating rectangular voltage is fed to the differentiating circuit 13. Then these pulses amplified by a transformer amplifier 14, the input of a single vibrator 15 is inverted and supplied. At its output, voltage pulses of a rectangular shape are obtained. These impulses are then subjected to logical inversion by an inverter 16 and differentiated by a differential circuit 17. In this case, the rear edge of the differentiated pulses is used to start one vibrator 18. A rectangular voltage is formed at its output. These pulses, after amplification by an electronic amplifier 19, are used to start the device and an electronic key 9. By synchronizing the operation of the key with the pulses of an exemplary rectangular voltage source 1, it switches on only that part of the voltage of the direct voltage, where the top is flat and The derivative of the output voltage of the inductive voltage divider 4 is zero. In other words, the electronic key is included only for a fraction of the duration of the rectangular pulse, at which the output voltage level is unchanged. Due to this, the voltage level on the capacitor 10 and the steady state operation can be brought to the output1: the level of the exemplary source 1 of an alternating rectangular voltage divided by an inductive voltage divider 4 times. Next, the voltage on the capacitor 10 is transferred to the output of the voltage calibrator Through, the amplifier 11, which is a precision voltage follower (for example, with field-effect transistors at the input, with a transmission coefficient close to unity), has practically no distortion; divider voltage. Claims A DC voltage calibrator containing an exemplary rectangular voltage source, a multi-decade inductive voltage divider, an electronic switch, a storage capacitor, and a DC amplifier, characterized in that, in order to improve accuracy and calibration, it is equipped with a pulse top driver in the form of a rectangular voltage source connected to the auxiliary output, an excitation winding introduced into the older decade of the divider, and an electronic key control circuit, connect connected to the output of a square voltage generator. Sources of information taken into account in the examination 1.Rosenblat M.T., Mikhailov G. X. Sources of calibrated DC voltages. M., Energie, 1976, p. 70 2. The UK patent number 977120, cl. G 4 I, 09.04.63 prototype) output FIG. 2