SU1529455A1 - Device for automatic switching of measurement ranges - Google Patents

Abstract

The invention relates to automation and computing and can be used, in particular, in multi-range electronic digital devices and measurement information system nodes. The purpose of the invention is to simplify the device. The device contains input 1 and output 2 buses, an operational amplifier 3, groups of scaling resistors 4, groups of keys 5, 6, dividing diodes 7, 10, triggers 8, 9, a decoder 11, and resetting the input 12 of the device. 2 Il.

Description

one

(21) 4256908 / 24-24

(22) 04.06.87

(46) 12/15/89. Bul № 46 (72) A.G. Biryukov

(53) 681.325 (088 „8)

(56) USSR Copyright Certificate No. 834891, cl. H 03 M 1/50, 1977.

USSR author's certificate 1241475, cl. H 03 M 1/50, 1985.

(54) DEVICE FOR AUTOMATIC SWITCHING OF MEASURING RANGE

(57) The invention relates to automation and computing and can be used, in particular, in multi-range electronic digital devices and nodes of measuring information systems. The purpose of the invention is to simplify the device. The device contains input 1 and output 2 bus, operational amplifier

3, scaling resistor groups

4, key groups 5, 6, dividing diodes 7, 10, triggers 8, 9, descrambler 11, resetting input device 12. 2 pe.

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cl

The invention relates to automation and computing, and can be used, in particular, in multi-range electronic digital devices and nodes of measuring information systems

The purpose of the invention is to simplify the device

The figure shows the functional diagram of the device; figure 2 - the truth table of the decoder.

The device for automatic switching of measurement ranges consists of input 1 and output 2 buses, operational amplifier 3, group of scaling resistors A, first group of keys 5, second group of keys 6, first isolation diode 7, first 8 and second 9 flip-flops, second separation diode 10 decoder 11 and the reset input 12 of the device.

A device for automatically switching measurement ranges operates as follows.

The initial state of the device is such that the triggers 8 are set by the Sbrog signal to the zero state. With KOTOpt. according to the truth table decipher, .1tor (figure 2) the contacts of the first and BT,. Mi key groups 5 and 6 are closed. It. corresponds to the maximum gain of the operational amplifier 3. A recording signal is continuously supplied to the write resolution bus (SRR). When the signal is fed to the input bus 1, it is maximally amplified, since in the feedback circuit, the operational amplifier 3 is switched on through the closed and K1 contacts of the first group 5 of keys, the resistor voltage divider with the maximum R1 / R ratio formed by the scaling resistors Groups 4. This signal pic falls on the output bus 2 and - 4epej the first separation diode 7 - on the S-BXO; ii -; p-trigger 8 (through a closed contact K1 of the first key of the second group of keys 6) When the amplitude of the signal exceeds the response level of the first trigger 8 at the set input S, the latter is triggered, resulting in inputs C), C2 of the decoder 11 generating code 01 , and at the second output of the decoder 11 - the signal to enable the closure of the contacts K2 and K2 with the contacts K1 and Kl blur

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five

0

five

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Thus, the operational amplifier 3 is switched to the gain mode, defined; The ratio of the resistors R2 / R of group 4 and the output S of the second 9 flip-flop through the closed contact K2 and the separation diode 7 connects the output bus 2,. With a further increase in the signal at the output of the operational amplifier 3, the second flip-flop 9o is triggered. C2 of the decoder 11 generates a code 11, and at its third output there is a permission to close the next pair of keys of the first and second groups 5 and 6 of the keys and the next switching of the operational amplifier 3 to the new range (figure 2).

Claims (1)

Invention Formula A device for automatically switching measurement ranges containing an operational amplifier connected by a first input to an input bus of a device, a group of scaling resistors, a first group of keys, two triggers and a decoder connected by inputs to the outputs of the triggers, and outputs to the control inputs of the keys of the first group, each the i-th (1 i А) of which are connected by a signal input to the output Bus of the device, and the output to the first output of the i-ro scaling resistor of the group, with the first output of the fifth scaling resistor the group is connected to the zero potential bus, and the zeroing input of the second trigger is connected to the input of bringing the device to the initial state, characterized in that, in order to simplify the device, it contains the second group of keys and two isolation diodes, and the operational amplifier is connected to the second input to the second the pins of the scaling resistors of the group, and the output to the output bus of the device and the anode of the first isolation diode, the cathode of which is connected to the signal inputs of the keys of the second group connected by control inputs rows to the control inputs of the first group of similar keys, wherein the outputs of the first and second keys of the second group are connected to the setting inputs 1 of the first and second flip-flops, respectively, and the output of the third switch is connected to the second input rpynnji first zeroing body diode connected by an anode running condition FIG. 2