SU744966A1 - Device for testing voltage-to-code converters - Google Patents

Description

The invention relates to computing technology and can be used when testing voltage transducers for a counterbalance code during operation. As a prototype, a known device for testing voltage-code converters is taken, and the controller contains a sample converter, a code-voltage, a code sensor, a code comparison device l. A disadvantage of this device is the need to use a code-voltage converter, the accuracy and size of which must be higher than that of the converter being tested, greatly complicates the system. The aim of the invention is to increase the reliability of the device. The goal is achieved by the fact that the device for checking the transform-aggel voltage-code, made on the basis of the computing device, the input of which is connected to the device being tested. containing the source of the reference voltage, the switch, the element1 T is compared with the code-for-eg-pg driver with the R-2g resistor set, the inverter and the source of the reference voltage are input into it, the output of the tested converter is connected To the input of the inverter, the output of which is {the eez key is connected to the low-order resistor of the R-2P grid, and one of the measuring inputs of the voltage-code converter is connected to the zero potential, the other to the output of the sample voltage source. The drawing shows a diagram of the proposed device. It contains a multichannel voltage-to-voltage converter 1 including a switch 2, a comparison circuit 3, a reference voltage source 4, a voltage converter 5, a voltage converter, an inverter 6, a computing device 7. a claim for a point B of the reference voltage. The converter 5 code load consists of

P-2R 9 electrical grid, 10 key block, key 11, register 12. Measuring inputs of voltage-code converter 1 connected to the output of source 8 of the sample voltage and to zero potential, output of converter 1 is connected to the input of the calculator 1 of the basic device A tick to a digital input of a gp for maker 5 code voltage, the output of a reference source 4 is connected to a reference input of a code voltage converter 5 and to an input of an inverter 6, the output of which via a key 11 is connected to a lower bit of resistor grid 9. Computing device 7 contains PLCC arithmetic unit, control unit and memory, i.e. it can act as a code sensor and code comparison device.

The device works as follows.

When checking the operability, key C is closed and switch 2 connects a zero potential to the measuring input. In this case, an inverted reference voltage is supplied to the lower bit (additional) of the R-2R 9 grid, which in the R-2R 9 grid is divided and summed with the standards bits Then, the zero potential is digitized by a known bitwise balancing method. The answer is that an extra clock is added, in which all the keys of the block 10, the key, except the key 11, are closed at zero loss. The result of the digitization enters the computing device 7 and compares with the expected.

The inverter transmission coefficient depends on the magnitude of the error at zero. Since the R-2R grid divides the voltage from the inverter output by - times where Y is the number of information bits, when the error value is at zero, more than half of the younger information bit (taking into account what was said about the required check voltage value) Inverter should be a unit.

To ensure that all information bits are checked, the error at zero must be less than half of the low information bit, and the inverter transmission coefficient can be taken to be equal to one. In this case, the key 11 can be excluded and the output of the inverter b is directly connected to the lower section of the grid R-2R 9 (dotted line in the drawing). This will lead to a shift in the quantization scale by half the discrete and decrease in the insensitivity zone in the region of zero.

The proposed scheme of the device for checking the firmware is not known and ensures sufficient verification of the voltage-code converter.

Claims: Device for testing voltage transformers — A code made on the basis of a computing device whose input is connected to a test converter containing a source of reference voltage, a switch, a reference element and a converter, a voltage code with a resistor grid R-2R, different that, in order to increase hope, an inverter and a source of reference voltage are introduced into it, the output of the source of the reference voltage of the tested converter is connected to the input of the inverter, the output cerned through klx connected to younger discharge grid resistor R-2R, and one of the measuring transducer input voltage code coupled to zero potential, -drugoys source output, an exemplary voltage.

Sources of information taken into account in the examination

1. Smolov V. B. and others. Universal electronic data converters. L., 1971, p. 28.5, fig. U-Zb (prototype).

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Claims (1)

SUMMARY OF THE INVENTION A device for testing voltage-to-code converters based on a computing device, the input of which is connected to a tested converter containing a reference voltage source, a switch, a comparison element, and a code-voltage converter with a resistor grid R-2R, characterized in that, with In order to increase reliability, an inverter and a reference voltage source are introduced into it, the output of the reference voltage source of the tested converter is connected to the inverter input, the output of which on through the switch connected to the least significant bit grid resistor R-2R, and one of the voltage measuring input code converter is connected to zero potential, drugoys istochnika.obraztsovogo output voltage.