SU1543270A1 - Equivalent of ionizing pressure transducer - Google Patents

Abstract

The invention relates to vacuum gauge tests and allows to extend the functionality by simulating the effect of the modulator on the pressure reading. The resistor 3 and the lamp 10 simulate the cathode converter's filament. The lamp 10 allows you to visually monitor the dynamics of the filament of the cathode: smooth or shallow when turned on. Resistors 1, 2 and transistor 9 imitate the emission characteristics of a converter: an increase in emission with an increase in the cathode heat of the converter and vice versa. By changing the position of the moving contact of resistor 2, the emissivity of the cathode of the converter is simulated in time or under pressure. By changing the position of the moving contact of the resistor 2, the quality of the stabilization of the cathode emission of the converter by the measuring unit of the vacuum gauge is checked. The switch 12 in the closed state simulates the operation of the modulator at high pressure, and in the open state, the operation of the modulator at low pressure. 1 il.

Description

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The invention relates to vacuum technology, namely to measuring the pressure of a rarefied gas, and may find application in vacuum gauge test devices.

The aim of the invention is to expand the functional capabilities of the device by providing a simulation of the effect of the modulator on the sample.

pressure.

The drawing shows a circuit diagram of the device.

The equivalent contains resistors 1-8, a transistor 9, an incandescent lamp 10, a diode 11, and a switch 12. The equivalent is connected to the measuring unit 13 of an ion gauge vacuum gauge. Resistor 3 and lamp 10 simulate the cathode converter's hot circuit. The lamp 10 allows you to visually monitor the dynamics of the filament of the cathode: smooth or shallow when turned on.

Resistors 1 and 2 and transistor 9 imitate the emission characteristics of a converter: an increase in emission with an increase in the cathode glow of the converter and vice versa. By changing the position of the moving contact of the resistor 2, the emissivity of the cathode of the converter is simulated over time or under the influence of pressure (cooling, poisoning, etc.). By changing the position of the moving contact of the resistor 2, the quality of stabilization of the cathode emission of the converter by the gauge gauge block, the range of permissible changes in the current of the cathode filament is checked.

The diode 11, the switch 12 in the closed state, and the resistors 4,5,6 and 8 imitate the operation of the modulator at high pressure — different currents and amplifier circuits at high voltage on the modulator and zero.

When the modulator is zonulenin, the diode 11 does not pass a current in the opposite direction, and the voltage at all points of the resistor circuit 4-6 is equal to the cathode bias voltage.

When the switch 12 is open, diode 11 and resistors 4-7 simulate the modulator operation at low pressure, when the relative difference of the current in the ion collector circuit is small due to the presence in both cases (zero modulator or constant voltage of a constant background current.

Equivalent works as follows.

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The equivalent is connected to the test gauge. The operation of the vacuum gauge emission stabilizer is checked. When the switch 12 is closed, pressure readings P8 and P0 and the ability of the vacuum gauge to calculate and remember the value of the modulation coefficient t are checked. When the switch 12 is open, the pressure measurement mode using modulation should receive a reading of the actual pressure P calculated by the expression

P - PilP

P 1-p

where Рв and Р0 are pressure readings at high voltage at the modulator and at the lowered modulator, respectively.

The coincidence of the obtained and calculated values of the samples indicates that the power supply to the modulator, the processor and the storage device work normally. Another pressure reading indicates a vacuum gauge malfunction.

Claims (1)

Thus, the equivalent provides imitation of the operation of the PMI-55 type converter together with the VIC-9 / 0-001 vacuum gauge. Invention Formula The equivalent of an ionization pressure transducer containing an anode supply terminal and connected to two terminals for connecting the transmitter filament circuit and connected in parallel1, incandescent lamp, fixed resistor and variable resistor, and also containing a transistor, the base of which is connected to the moving contact of the variable resistor, the emitter with the negative terminal the power terminal, and the collector through a resistor - with a terminal for connecting the power supply to the anode of the converter, characterized in that, in order to expand the functional possibilities As a result of providing simulations of the effect of the modulator on the pressure reading, five resistors, a diode, a switch and two additional terminals for connecting the modulator and the converter collector are additionally introduced, the terminal for connecting the collector connected in series through the first and second resistors emitte515432706 a transistor, a terminal for connecting the eistors, and the connection point of the third modulator through the second diode and the fourth resistor through the successively connected third and connected switches the fourth resistor is connected to the point and the fifth resistor connected to the terminal of the connection of the first and second relays for connecting the collector.