SU773508A1

SU773508A1 - Input device for digital multimeter

Info

Publication number: SU773508A1
Application number: SU782633920A
Authority: SU
Inventors: Игорь Михайлович Вишенчук; Нина Георгиевна Гитшов; Олег Оскарович Каганов; Альберт Петрович Конопкин; Роман Васильевич Курдыдык; Александр Иванович Холоша
Original assignee: Львовский Ордена Ленина Политехнический Институт
Priority date: 1978-06-27
Filing date: 1978-06-27
Publication date: 1980-10-23

Description

Изобретение относитс к,электроизмерительной технике и может быть использовано при построении входных устройств многофункциональных 5 малогабаритных цифровых измерительных приборов с автоматическим переключением пределов измерени и автономным питанием.The invention relates to electrical measuring equipment and can be used in the construction of input devices of multifunctional 5 small-sized digital measuring devices with automatic switching of measuring limits and autonomous power.

Известно входное устройство циф- tO рового мультиметра, содержащее преобразователи, переключатель с группами контактов и ключи коммутации . Переключателем выбирают вид измер емого сигнала (напр жение, ток j или сопротивление) , а ключаг-чи коммутации задают необходимыйпредел измерени .The input device of a digital multimeter is known, which contains transducers, a switch with groups of contacts and switching keys. The switch selects the type of the measured signal (voltage, current j or resistance), and the switch keys set the required measurement limit.

Недостатком устройства вл етс низка надежности устройства из-за 20 большого числа ключей, количество которых равно числу пределов измерени , умноженному на число преобразователей .The drawback of the device is the low reliability of the device due to the 20 large number of keys, the number of which is equal to the number of measurement limits multiplied by the number of converters.

Наиболее близким техническим 25 решением к предлагаемому изобретению вл етс входное устройство цифрового мультиметра, содержаедее преобразователи , входы которых через контакты, первой группы перек.точател подключены ко входу устройства , а выходы через контакты второй группы переключател - к выходу устройства. Коммутационные выводы преобразователей соединены между собой попарно через к.точи коммута- ции 2,The closest technical solution to the present invention is the input device of a digital multimeter, containing transducers, the inputs of which through the contacts of the first group of the pointer are connected to the input of the device, and the outputs through the contacts of the second group of switch to the output of the device. The switching outputs of the converters are interconnected in pairs through the switching circuit 2,

Недостатком устройства вл етс также повышенный расход мощности от автономного источника, что снижает врем непрерывной работы переносного мультиметра. Недостаток обусловлен тем, что в известном устройстве количество ключей коммутации равно числу пределов измерени , умноженноь у на число преобразователей. Кроме того, большое число ключей коммутации пределов измерени снижает надежность мультиметра.The drawback of the device is also increased power consumption from an autonomous source, which reduces the time of continuous operation of the portable multimeter. The disadvantage is that in the known device the number of switching keys is equal to the number of measurement limits multiplied by the number of converters. In addition, the large number of switching keys of the measurement limits reduces the reliability of the multimeter.

Цель изобретени - снижение потребл емой мощности и повышение надежности .The purpose of the invention is to reduce power consumption and increase reliability.

Claims

The goal is achieved by the fact that the input device has a digital multimeter containing transducers with switching leads and switching switches., Transducer inputs through the contacts of the first switch group are connected to the device input, and outputs through the contacts of the second switch group to the output of the switch, introduced a third group of switch contacts, which are connected on one side with the switching outputs of the converters and the switching outputs of one of the drivers are connected in pairs between each through the contacts of the third switch group and switching keys, all even and odd switching outputs of the converters are interconnected through the contacts of the third switch group, and the number of switching keys is equal to the number of measurement limits. The drawing shows the block diagrams of the input device of the digital multi meter. The device contains three converters 1, 2. and 3, the inputs of which black contacts 4, 5 and 6 of the first group 7 of the switch are connected to the input of the device 8, and the outputs through contacts 9 10 and 11 of the second group 12 of the switch l to the output of the device 13. The switching outputs of the converter 1, the number of which is equal to the number of measurement limits, are connected in pairs to one another via the contacts 14, 15, 16, 17, 18 and 19 of the third group of switch 20 .. the switch and the switching keys 21, 22 and 23. Even and odd switching outputs converters 1, 2 and 3 are interconnected through contacts 14, 24, 25, 15, 26 and 27 and so on of the third group of 20 switch Input device. Works in the following way. Using contacts 4, 5 and b of the first group 7 of the switch and contacts 9, 10 and 11 of the second group 12 of the switch connect the Converter 2 and to the input 8 and the output 13 of the device. Switching keys 21, 22 and 23, on commands from an external automation unit, close the corresponding to mutational outputs of converter 2, i.e., they switch measurement limits. Contacts 24.26, etc., of the third group of 20 switches are closed, and the remaining contacts are from 14 to 19 and 25, 27 are open. Therefore, the possibility of simultaneous operation of two converters 1 and 3 and more. The present invention reduces the number of switching keys to the number of measurement limits. As shown by the comparative experiments of the proposed input device of the multimeter and the known one, this provides a 4 times power consumption from an autonomous power source. At the same time, the continuous operation time of the multimeter from a car power source is also 4 times longer. An input device of a digital multimeter containing transducers with switching leads and switching keys, transducer inputs through the contacts of the first switch group are connected to the input of the device, and outputs through the B-switch contacts of the switch group to the output of the device, in order to reduce the consumption power and increase reliability, it introduced a third group of switch contacts, which are connected on one side with the switching outputs of the converters, and the comm Disable outputs of one of the converters are connected in pairs to each other through the contacts of the third switch group and switching keys, all even and odd switching outputs of the converters are connected to each other through the contacts of the third switch group, with the number of switching keys equal to the number of measurement limits. Sources of information taken into account in the examination 1. Hewlett Packarol Joural 1973, W 11, p. four.

2. Express information. Seri. Testing technology 1977, 14, p. 32.