SU100324A1 - Karottazhna station with high-speed electronic automatic potentiometer - Google Patents

Description

Cartoning stations with automatic electronic potentiometers are known.

However, in these stations, a very complicated scheme of separation of a parameter characterized by an alternating current (for example, a CS) from a parameter characterized by a constant current (for example, a PS) is applied.

The proposed carriage station is devoid of this disadvantage. This is achieved by using a filter system that protects electronic potentiometers from interferences and created the necessary mode of comfort for the latter when the same potentiometer is turned on before the pulsator, and the other after it.

The switching circuit of potentiometers KS and PS is shown in the drawing.

The fitting from the measuring electrodes goes to the terminals M and L. Each potentiometer consists of a reichord / on which a voltage is set in accordance with the selected measurement limit; scale switch 2, with which the required voltage is accumulated on a reichord; voltage divider 3, on which the difference between the measured voltage and voltage taken from the reichord is separated, and the electronic indicator-indicator 4, which amplifies the voltage removed from the divider to a value sufficient to control the reversible motor 5. The latter moves the slider Reohorda and pen recorder.

The motor 4 will rotate until the voltage removed from the rail becomes equal to the measured voltage. At this point, the voltage at the input of the amplifier (on the voltage divider) will become zero and the motor will stop.

It follows from the above that the measurement and recording of voltage are carried out according to a purely compensation circuit.

The CS and PS separation scheme is similar to that used in semi-automatic cartographic stations, i.e. PS is measured by a potentiometer connected in series to the pulsator 6, and CS is measured by a potentiometer connected after it.

Theory and experimentations show that industrial-frequency interference, switched by the measuring collector of the plasma generator, is converted depending on the speed

rotation of the pulsator in a wide range of frequencies, containing zero and similar harmonics for an unsuccessfully selected number of revolutions.

If no appropriate measures are taken, the said interference will distort the CS or PS diagram or both.

As shown in the drawing, the input of each of the electronic automatic potentiometers is protected by a P-shaped 9-W-L filter, which does not allow high frequencies to pass. The input of each null indicator is additionally protected by a filter consisting of a resistor 7 and a capacitor 8.

These filters attenuate any frequency interference. From this point of view, it is advisable to increase the parameters of the elements included in the filters. However, the growing time constant of the filter change makes it necessary to stop at certain values of individual elements.

Indeed, if the time constants of these filters become comparable with the duration of the shortest working pulse, then the amplitude of the latter is distorted.

Auto Potentiometer

is a Feedback system, inclined to switch to self-oscillation mode under certain conditions.

Depending on the phase of the voltage difference at the input of the null indicator, the system mode can be oscillatory, damped, or aperiodic. The voltage phase will depend on the parameter values of both filters.

For the mode of free oscillations, the U-shaped filter; p, together with the external resistance (resistance of the cable, electrodes and equivalent resistance of the second potentiometer) constitute the differentiating circuit, and the filter; p standing at the input of the zero indicator (elements 7 and 5) integrating. The first filter creates a demo (potency) potentiometer, the second tends to shake them up. The actions of these two filters are opposite in sign: one filter somehow compensates for the action of the other. By asking different parameters of the elements in these filters, you can get the desired coefficient of sedation of the whole system.

Subject invention

1. A cage station with a high-speed electronic automatic potentiometer, a filter for eliminating interference, and a pulsator for extracting alternating current characterizing the parameter being recorded (for example, a CS), characterized in that, in order to create the necessary reassurance of the potentiometer, this filter is located in the electrical circuit after pulsator, assembled according to a U-shaped scheme that filters out high frequencies, and an integrating cell composed of a resistance and a switch is turned on at the input of the zero-indicator of the potentiometer. densator2. The rosette station according to claim 1, O and m using a second potentiometer with a similar filter and integrating cell connected in series with a pulsator, in order to record also a parameter characterized by direct current voltage (for example, PS ).