SU524215A1 - Multichannel telemetering device - Google Patents

Description

The invention relates to telemetric systems and can be used in various devices for remote measurement and control. Telemetry transmitters of resistances of rheistor sensors to Measured Parameter 1 are known, comprising a sensor switch, a communication line, and a current converter in a recorded parameter. However, such converters do not allow to directly exclude the line resistances from the measurement result. The prototype of the invention is telemetering devices 2, which contain keys at the transmitter point, one contact of which is connected to ground and the other through a resistor sensor - to the emitter of the transistor, whose collector the communication line is connected to the receiving point on the current transducer. The low measurement accuracy of such devices is due to the influence of transient resistance contacts of the keys. The purpose of the invention is to increase the accuracy of measurements. This goal is achieved by the fact that in the proposed device the transmitting point contains additional keys connected by one contact through the source of the reference voltage to the base of the transistor, and by other contacts to the other contacts of the keys. Diagram of the device shown in the drawing. The device contains at the receiving point a current transducer into the measured pa. Parameter Ij communication line 2 at the transmitting point a transmitting device. The latter contains resistor sensors 4, keys 5, transistor 6, additional keys 7, the source of the reference voltage. 8 and switch: 9. The device works as follows. The switch 9. opens one of the keys 5 and the key 7 working synchronously with it. In this case, the sensor is set to a voltage equal to the reference voltage and through the sensor, the communication line and the charge capacitor are packaged. A current flows, the value of which depends only on the resistance of the sensor. Thus, the readings from the sensors do not change the voltage of the power supply, the communication line resistance, the level of interference in it, and the transient resistance of the keys, as much as the current flow in the system, which is caused by these factors, is automatically KO. v is retired by the circuit circuit1. At the receiving point, instead of the converter of the amount of current flowing in the communication line, any known current converter to the required recorded parameter Additional keys 7 are turned on after before with a high-impedance control transistor, therefore, the requirements for the resistance of these switches in the open state are low. In the closed state 7, they must have high resistance to eliminate the shunt effect of the adjacent 1 channel on the measurement result.

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Claims (1)

S In the proposed device, the effect of link resistance and interference on the measurement result is reduced. Claims of the invention: A multichannel telemetering device containing keys at the transmitting point, one contact which is connected to ground and the other through a resistor sensor with an emitter of the transistor, the collector of which is connected through a communication line to the receiving point on a current transducer, characterized in that In order to improve the measurement accuracy, at the transmitting point, locking keys are connected, connected by their contacts through the source of the reference voltage to the base of the transistor, and others. to H1gaktami - with other contacts of keys. Sources of information taken into account during the examination: 1, Copyright Certificate 327456 USSR, CL, G 08 C 19/02, 2, Circuits, with semiconductor devices. M ,, Military Publishing, I960, p. 64-66,