SU898332A1

SU898332A1 - Method of measuring resistor resistance

Info

Publication number: SU898332A1
Application number: SU782632395A
Authority: SU
Inventors: Юрий Федорович Чубаров; Владимир Сергеевич Мелентьев
Original assignee: Куйбышевский политехнический институт им.В.В.Куйбышева
Priority date: 1978-06-26
Filing date: 1978-06-26
Publication date: 1982-01-15

Description

(54) СПОСОБ ИЗМЕРЕНИЯ СОПРОТИВЛЕНИЯ РЕЗИСТОРА(54) METHOD OF MEASURING RESISTANCE RESISTANCE

Изобретение относитс к электроизмерительной технике и может быть использовано при проверке и измерении сопротивлени резистора.The invention relates to electrical measuring equipment and can be used in testing and measuring the resistance of a resistor.

Известны способы измерени сопротивлени резистора.Methods are known for measuring the resistance of a resistor.

Один из известных способов измерени сопротивлени резистора основан на преобразовании величины сопро .тивлени в интервал времени tl.One of the known methods for measuring the resistance of a resistor is based on converting the resistance value into a time interval tl.

Недостатком известного способа вл етс низка точность измерени .The disadvantage of this method is low measurement accuracy.

Наиболее близким техническим решением к изобретению вл етс способ измерени сопротивлени резистора, заключающийс в том, что на измерительную цепь, состо щую из г алиброванного и исследуемого элементов, и резистивный делитель напр жени подают линейно измен ющеес напр жение, определ ют момент равенства напр жений на средних точках измерительной цепи и делител и выдел ют интервал времени, пропорциональный измер емому параметру 2.The closest technical solution to the invention is a method for measuring the resistance of a resistor, which consists in the fact that a linearly varying voltage is applied to the measuring circuit consisting of the calibrated and studied elements and the resistive voltage divider, the moment of equality of the voltages the middle points of the measuring circuit and the divider and allocate a time interval proportional to the measured parameter 2.

Недостатком известного способа вл етс больша погрешность измерени , обусловленна вли нием нелинейности линейно измен ющегос напр жени на результат измерени и неточностью измерени при наличии посто нной помехи (напр жени ) на измер емом объекте.The disadvantage of this method is the large measurement error due to the influence of nonlinearity of the linearly varying voltage on the measurement result and the inaccuracy of measurement in the presence of a constant disturbance (voltage) on the measured object.

Цель изобретени - повышение точности измерени сопротивлени резистора .The purpose of the invention is to improve the measurement accuracy of the resistor.

Поставленна цель достигаетс тем, что согласно способу, основанному на The goal is achieved by the fact that according to the method based on

10 преобразовании измер емого параметра в интервал времени путем подачи на измерительную цепь линейно измен ющегос напр жени , измерительна цепь выполнена в виде делител напр 15 жени , состо щего из последовательно соединенных образцового и исследуемого резисторов, напр жение с выхода делител вычитают из линейно измен ющегос напр жени , разностное напр 20 жение сравнивают с опорным, в момент их равенства скачком увеличивают линейно измен ющеес напр жение, подаваемое на измерительную цепь, вновь сравнивают разностное напр жение с 10 converting the measured parameter into the time interval by applying a linearly varying voltage to the measuring circuit, the measuring circuit is made in the form of a voltage divider 15 consisting of series-connected exemplary and test resistors, the voltage from the divider output is subtracted from the linearly varying voltage differential voltage 20 is compared with the reference voltage; at the moment of their equality, the linearly varying voltage applied to the measuring circuit is suddenly increased and the differential voltage is compared again. of a

25 опорным и измер ют интервал времени между первым и вторым моментами равенства разностного напр жени с опорным.25 is the reference, and the time interval between the first and second moments of the equality of the differential voltage with the reference is measured.

На фиг. 1 изображена блок-схема FIG. 1 is a block diagram.

Claims

30 devices implementing the method; , Fig. 2 - voltage plots that illustrate the operation of the device. The device contains calibrated 1 and 2 resistors under investigation ,. the inertor 3, the threshold device 4 and the voltage regulating device 5. The resistance is measured as follows. On the measuring circuit consisting of a divider formed by a calibrated 1 (RO) and 2 (R) resistors under study, and through an inverter 3 to the p-average point of the measuring circuit, the linearly varying voltage and KEgt are determined and the response time of the threshold device ( t.,) with any given threshold for triggering and connected to the midpoint of the measuring circuit. At this moment there will be a ratio of and "+ and + Ufe o, where is the voltage.) Rit V t; - & times less voltage U y, k + Rj (- KEo {t-to). Then, i-change the voltage applied to the measuring circuit by this VQ value using the voltage regulating device 5 and again increasing the linearly varying voltage until the threshold device 4 (trj) is triggered. this moment takes place the relationship Un + URr + UW RX about where),, The time interval between the first and second triggering of the threshold device 4 is proportional to the resistor measured: RO: VV ° ° ° 1 Еп1Ч- .R, 4 (,) - if you choose KED - RO X H - RX. When measuring large resistances in parallel with the measuring resistor Nd, a resistor can be switched on, the value of which depends on the selected measurement limit. When measuring conductivity, the measured and reference resistors change places. Then KEg {t | -t) -Р--, and if, TO T | -. The measurement accuracy of the resistor in this method is higher than the measurement accuracy by a known method due to the absence of error in the implemented device due to the instability of the threshold voltage. Claims The method of measuring the resistance of a resistor, based on converting the measured parameter to the time interval by applying a linearly varying voltage to the meter, characterized in that, in order to improve the measurement accuracy, the measuring circuit is made in the form of a voltage divider consisting of series-connected exemplary and test resistors, the voltage at the output of the divider is subtracted from the linearly varying voltage / differential voltage - compared with the reference voltage, at the time of their p equality abruptly increase linearly a varying voltage - applied to a measuring circuit, again comparing the difference with a reference voltage and the measured time interval between the first and second moments of the difference equal to the reference voltage. Sources of information taken into account in the examination 1. Authorship certificate of the USSR 472455, cl. H03 K 13/20, 1972.

2. Authors' certificate of the USSR No. 270881, cl. G01 R 17/00, 1969.