SU1224584A1 - Reading device with digital indication - Google Patents

Abstract

The invention relates to the field of instrumentation and can be used in reading systems of devices for measuring linear dimensions and displacements. The purpose of the invention is to improve the accuracy and convenience of reference, expanding the possibility of its automation. The control unit 1 supplies the voltage through the switch 2 to the risk electrodes of the main scale, the switch 3 is produced

Description

alternately connecting the reed-electrodes of the diagonal cabinet 11 to the capacitance meter 5. The determined capacitance value is compared in comparison unit 6 with the maximum possible capacitance value of the two risok-electrodes on the main and vernier scales 1 and 11 when they are combined. When a zero signal appears at the output of the capacitance meter 5, the unit 1 issues a command

one

The invention relates to instrumentation engineering and can be used in reading systems of devices for measuring linear dimensions and displacements. -

The purpose of the invention is to improve the accuracy and convenience of reference and expand the possibilities of its automation.

The drawing shows a functional diagram of the reading device by a digital display.

The device contains a control unit, 1, switch 2 of the main scale electrodes, switch 3, vernier scale electrodes 3, switch number 4, capacitance meter 5, comparison unit 6, decoder 7, adder 8, digital display unit 9, and 10 and an additional vernier 11 scale made of a dielectric with electrically conductive risks applied to them by electrodes 12.

The device works as follows.

When a control unit 1 arrives at the outside of the signal Measurement, it commands the switch 3 of the vernier scale electrodes to connect the voltage to the two extreme risks of the vernier scale 11 and com-. the mutator 2 of the main scale electrodes on the alternate connection of the electrodes 12 of the main scale 10 alternately to the capacitance meter 5, which continues until the capacitance meter 5 appears at the output of a signal other than zero. A signal about this comes from the capacitance meter 5 to the control unit 1, which issues a command

switch 3 to stop switching, and the contents of counter 4 are entered into decoder 7, from there to adder 8, where the counting results on the main and vernier scales are added and converted from binary weighting code to decimal, which is fed to indicator 9, thus providing counting in decimal form with a digital display. 1 il.

the switch 2 of the main electrodes on the main scale to stop switching, fixing the position of the last measurement. In this case, the counter 4 of the number of switchings determines the number of the risk electrode, which coincides, in whole or in part, with the initial risk-electrode of the Vernier scale. In case it completely coincides with the gap between the risk-electrodes of the main scale, then the meter determines the number of risk-electrode, which coincided with the last electrode of the vernier scale. To recognize each of the riso electrodes of the vernier scale. participates in the measurement, the control unit 1 commands the switch 3 to disconnect the last risk electrode from the voltage source. If at the output of the capacitance meter 5 a signal other than zero is saved, then the totalizer 8 records the contents of the counter 4 of the number of measurements (n) without change. In the event that this signal becomes equal to zero, the contents of counter 4 are entered into adder 8 minus the length of the vernier ppsa (n- (L-2).

Next, the transition to the readout on the vernier scale 11 is carried out. The control unit 1 applies the voltage through the switch 2 to the risk electrodes of the main scale (starting with the number entered in the adder) located in the control zone of the additional vernier scale, and the switch 3 performs alternate the connection of the ок ок electrodes of the vernier scale 11 to the capacitance meter 5. The determined value of capacitance C is compared in

Comparison unit 6 with the maximum possible capacitance value of two Risk-electrodes on the main 1 and a nano-11 scale with their full combination. When a zero signal appears at the output of the capacitance meter 5, which corresponds to the full alignment of one of the raiska electrodes of the Vernier scale 11 with the gap between adjacent risk electrodes of the main scale 10, the control unit 1 sends a command to the switch 3 to stop switching, and the contents of the counter 4 K is entered into the decoder 7, from where the corresponding linear dimension equal to (К-Ф) comes to adder 8 (Ф is the division value of the vernier scale). In case the zero signal appears at the output of block 6, the vernier hex counting is done in the same way, but half the cost of dividing the main scale (0.5 F) is added to the value obtained in the decoder 7.

In the adder 8, the counting results on the main and vernier scales are added and converted from the binary weight code to the decimal code, which is fed to the input of the digital indicator 9.

Thus, the proposed device provides accurate and convenient readout directly in decimal form from a digital indicator or

Editor A. Ogar

Compiled by N.Lankov Tehred I.Popovich

Order 1939/37 Circulation 705Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design, 4.

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entering it in binary code into an automated device.

Claims (1)

Invention Formula A readout device with a digital indication containing the main and additional vernial scales, made of a dielectric material with electrically conducting risk electrodes applied to it, equal in width to the gap between them on the main scale, which is different in that convenience of reference, sequentially connected control unit, first and second switches, a capacitance meter, a comparison unit, a decoder, an adder and a digital display unit, and the risks are based on electrodes Noah and Vernier scales are connected to the corresponding inputs of the first and second switches, the second outputs of which are connected to the corresponding inputs of the counter, the second output of the capacitance meter is connected to the second input of the control unit, the third input of which is connected to the second output of the comparison unit, its fourth input - to the output of the counter The second and third outputs of which are respectively connected to the second inputs of the decoder and the adder. Proofreader M. Pojo