SU951694A1 - Device for measuring analog values with automatic scaling - Google Patents

Description

(5) DEVICE FOR MEASURING ANALOG

VALUES WITH AUTOMATIC ZOOMING

The invention relates to a pulse technique and can be used in measuring devices, as well as in information measuring systems for measuring analog values in a wide range with automatic scaling. A device for measuring analog quantities with automatic scaling is known, comprising a series-connected zoom unit, a scale selector, a first pulse distributor, a first element i1 and a first clock generator, an analog-to-digital converter (ADC), for example, bitwise equilibration, which includes connected zero Organ, digital-to-analog converter (D / A converter), control unit, second pulse distributor, second And element, and second sync pulse generator c, a single vibrator; the second input of the zoom unit is the first input of the device, the one-shot input is the second input of the device, the output of the zoom unit is connected to the second input of the zero-organ whose output is connected to the second input of the control unit, the output of the single-vibration is connected to the inputs generators of sync pulses and with the second inputs of pulse distributors, the second input of the dial of the scale and the third input of the control unit. The known device also contains a minimum value decoder, which determines the correspondence between the input analog signal equal to zero and the output code of the ADC (for example, 1.0 ... O) and the maximum value decoder, which determines compliance with the input analog signal exceeding the voltage value, limited ADC capabilities, and the maximum possible ADC code (for example, 1.1 ... 1 for positive polarity and 0.0 ... O for negative

The polarities of the input analog signal) 1J.

A disadvantage of the known device is the low speed of the need, each time before switching the scale of the next scale, to carry out the LCP conversion cycle. As a result, the measurement time is determined by the number of sync pulses spent on enumerating the scaling scales and the number of sync pulses spent on all the conversion cycles. -. ADCs, which are necessary to select the desired scale of scaling.

The purpose of the invention is to increase speed.

The goal is achieved by the fact that the device for measuring analog quantities with automatic scaling, containing a one-shot, whose input is connected to the first input bus, are connected in series, a zoom unit, the second input of which is connected to the second input bus, selector scale, first pulse distributor , the first element And the first generator of clock pulses, analog-to-digital converter, made on serially connected nulyorgan, digital-analog converter ,, block control, the second element And, the second pulse distributor and the second clock generator, the second input of which is connected to the second input of the first clock generator, output, single-oscillator, with the second inputs of the pulse distributor, the second input of the selector dial and the third input of the control unit, and the second input zero The organ is connected to the output of the zoom unit, and its output is connected to the second input of the control unit, the serially connected elements are EXCLUDED THE ALTER OR., AND-NO and NOT, with the first input EXCLUSIVE OR is connected to the output of the zero-body, the input is connected to the first output of the control unit, the second input of the element is NOT the first output of the second pulse distributor, and the output is connected to the second input of the second element AND, the output of the element is NOT connected to the second input of the first element I.

The drawing shows a device for measuring analog quantities with automatic scaling.

The device contains a scaler 1, a scale selector 2, a first pulse distributor 3, a first element 4 I, a first generator 5 clock pulses, an analog-to-digital converter (of bit balancing, including a series-connected null-organ 7, a digital-analog converter DAC 8, control block 9, impulse distributor 10 pulses, second element 11 I, and second sync pulse generator 12. The device also contains a one-shot 13, first input bus 1, second input bus 15 first output tires 16 ( the outputs of the selector 2 of the scale) the second output bus 17 of the device {the outputs of the control unit 9), the element 18 EXCLUSIVE OR, the element 19 AND-NOT and the element 20 NOT.

The device works as follows.

When a signal is applied to the first input bus k, the one-shot 13 is triggered and the device is reset. In this case, in scale unit 1, a minimum scale is set, a code 1000 is generated at the output of control unit 9, voltage O is output at the output of DAC 8, and logical O is set at the first output of the second pulse distributor 10.

Claims (1)

1. US patent No. 3.187.323, cl. , 1965. Elele input of the second element And, the output Ele 95169 8