SU146369A1 - Device for measuring voltage levels - Google Patents

Description

A disadvantage of the known devices for measuring voltage levels, when using a dial gauge and kurbelnyh switches, is the need for silence and subtraction of readings.

The proposed device differs from the known ones in that it allows to automate the computational operations in such a way that the magnitude and sign of the whole number of nonperotoneous drones of the neper are automatically recorded on the device in absolute values, which are always added to the absolute values of the whole neper. This is achieved by using automatically switched functional converters with mutually inverse logarithmic characteristics.

The drawing shows a block diagram of a device consisting of three blocks: block A — an automatic counting of an integer number of aper block 5 — converters and block B — an indication.

Unit A consists of an input transformer /, splitter 2, a set of high-frequency relays 5, an amplifier 4, and a comparison circuit 5.

Block b consists of detector 6 and two automatically switched logarithmic transducers of positive 7 and negative 8

Block B consists of a switch instrument 9 and a light indication 10 of a whole number of neper carried out by a brush 11 of the searcher 12.

The principle of operation of the device is as follows.

Circuit 5 comparison is triggered when the input level of amplifier 4 is 5 nep. The level at the output of the amplifier is determined by the sensitivity of the comparison circuit.

The high-frequency relays 3 are switched by the brush 13 of the searcher 12, which moves as long as the circuit 5 detects that the level at the input of the amplifier is greater than 5 n.

No. 146369-2. The position of the stopped finder, commuting with the help of high-frequency relays 5, the corresponding part of the voltage of the divider 2, determines the absolute value and sign of the measured level.

Logarithmic converters are made on diodes according to the principle of linear-broken approximation of a logarithmic curve and have mutually inverse characteristics. The positive converter 7 operates at the reading of positive levels and gives the logarithmic characteristic of the current increasing from the measured level, and the negative converter 8 operates at the reading of negative levels and gives the falling characteristic of the current.

Consequently, when measuring two levels of the same magnitude but different in sign, the voltages at the input of converters 7 and 5 will be different, but the currents at their output will be equal.

The transducers are switched automatically using keys 14, which operate from a finder brush 15 and show that the searcher has stopped at a position corresponding to the measurement of positive (or negative) levels.

The fractional fractions of a neper are counted at the slits of instrument 9 in absolute values, which are added to the absolute values of the whole neper, and the sign of the measured level corresponds to the sign automatically shown when counting the whole neper.

According to NIITEPLOPRIBOR, the proposed device has important advantages and can be used in communication technology and other areas of the national economy.

Subject invention

A device for measuring voltage levels, comprising an automatic readout unit and an indicator, characterized in that, for the purpose of automating computational operations, it uses automatically switched functional converters with reciprocal logarithmic characteristics.

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