SU1674161A1 - Device for measuring quantities of analog nodes - Google Patents

Abstract

The invention relates to analog computing and can be used in automation devices, as well as computing technology as a means of control. The purpose of the invention is to improve the accuracy in measuring the output impedance of analog nodes. The device contains a sinusoidal voltage generator 1, an equilibration unit 2, an analog node 3 being analyzed, a switch 4, a load resistor 5, a detector 6, a comparison circuit 7, a reference voltage source 8, a subtractor 9, a start input 10 and an output 11. 1 or .

Description

(21) 4434491/24 (22) 05.31.88 (46) 08.30.91. Bul №32

(71) Yerevan Polytechnic Institute. K. Marx

(72) M.S., Garib N (53) 681.3 (088.8)

(56) Marché G. Operational amplifiers and their application. L .: Energie, 1974, p. 40, fig. 3-11.

USSR author's certificate Nfc 482698, cl. G 01 R 31/28, 1973. (54) DEVICE FOR MEASURING THE PARAMETERS OF ANALOG NODES

(57) The invention relates to analog computing and can be used in automation devices as well as computing techniques as a means of control. The purpose of the invention is to improve the accuracy in measuring the output impedance of analog nodes. The device contains a sinusoidal voltage generator 1, a balancing unit 2, an analyzed analog node 3 key 4, a load resistor 5, a detector 6, a comparison circuit 7, a reference voltage source 8, a subtractor 9, a start input 10 and an output of 11.1 Il.

The invention relates to analog technology and can be used in automation devices, as well as computing and measuring equipment as a means of control.

The purpose of the invention is to improve the accuracy in measuring the output impedance of analog nodes.

The drawing shows the functional diagram of the device.

The device comprises a sinusoidal voltage generator 1, an equilibration unit 2, an analog node 3 being analyzed, a switch 4, a load resistor 5, a detector 6, a comparison circuit 7, a reference voltage source 8, a subtractor 9, a start input 10 and an output 11.

A device for measuring the parameters of analog nodes works as follows.

From the output of the sinusoidal voltage generator 1, a signal is supplied through the balancing unit 2 to the input of the analyzed analog node 3. At the initial moment, a load resistor 5 is connected to the output of the analyzed analog node 3 through the switched on key 4. A variable signal with an effective voltage value Unagr., From the output of the analyzed analog node 3, goes to detector 6, where it is transformed into a proportional constant (voltage, and is fed to the first input, comparison circuit 7, to the second input of which from the output of the source 8 reference the voltage is applied to the constant reference voltage U0n.

When a trigger signal is applied to the input 10 of the device under the action of a signal from the output of the comparison circuit 7, the balancing unit 2 sets a voltage at the output of the analyzed analog node 3 such that the voltage at the output of it is in the loaded UHarp mode. Don.

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At the end of the working cycle, the balancing unit 2 automatically fixes its state, and the voltage of the analyzed analog node 3 is also fixed. Simultaneously, from the output of the conversion end of the balancing unit 2, the control input of the switch 4 is received, which is used to disconnect resistor 5 load and transfer of the analyzed analog node 3 in idle mode. At the same time, the output of the analyzed analog node 3 establishes a sinusoidal signal with an effective value of the voltage Ux.x. which through the detector 6 enters the input of the decremented subtraction unit 9 connected by the input of the reference voltage source 8 being subtracted to the output. At the output 11 of the device, we have the voltage of the terminals. Ux.x. - U0n. Knowing that Vyvykh - RH (UX.X -UHarp) / UHarp, where RH is the load resistance, we get Hout. RH (UX.X - Uon) / Uon. Since RH is const and U0n. censt, the expression for RBUX takes the form RBWX. RH / OPS Willow K Uvyh. To compensate for the value of K, you can use the appropriate ratios of the transfer ratios over the inputs of subtractor 9.

Claims (1)

An apparatus for measuring the parameters of analog nodes comprising a sinusoidal voltage generator connected by an output to an information input of a balance unit, the output of which is connected through the serially connected analog node and the detector connected to the first reference of the comparison circuit connected by a second input to the output of a reference voltage source and the output to the control input of the balancing unit, characterized in that, in order to improve the accuracy in measuring the output resistance analog nodes, a key, a load resistor, and a subtraction unit, whose output is the device output, are entered, and the inputs of the reduced and subtractable are connected respectively to the detector output and the output of the reference voltage source, the output of the analog node being analyzed is connected to the zero potential bus, the control input of the key is connected to the output of the equilibration termination of the equilibration unit, the trigger input of which is the device trigger input. /;