CS228603B1 - Arrangement of a measuring exchanger with the integrated digital voltmeter for displacement measuring by means of inductive sensing units - Google Patents

Description

Invention of the «connection» of a metering switchboard with an integrated digital voltmeter for measuring in the induction sensors ·

Up to now, the «metering switch β integrating digital voltmeter, used for automated measurement of input unidirectional voltages, the value of which is proportional to the measured physical quantity / temperature, force, pressure, deformation, displacement» below · /. Sensors are used to measure mechanical conditions that occur in the construction and heights »

228 603 whose output variable is a unidirectional electrical voltage proportional to the mechanical displacement. These are the most common resistance transmitters with a linear or circular path of the runner, or strain gauge displacement transducers, powered by a constant DC voltage, Salash. a plurality of transducers are inductive transducers whose physical nature is based on differential inductance in the axis of which the core of a soft magnetic material moves, which follows the mechanical displacement of the measured object. This sensor is supplied with an AC voltage, most often at a frequency of 1000 to 5000 Hz. The output voltage of the same frequency is of a magnitude and phase proportional to the measured mechanical displacement. the control panel needs to use a carrier amplifier for each sensor, which is costly when using multi-channel devices. Another method that has forced the use of metering central devices is an integrated inductive sensor in which the power generator, amplifier and demodulator are housed. The disadvantage of the integrated sensors (which are not a drawback for many applications) is that the sensitivity of the measurement cannot be changed. the sensors are more dimensionally dimensional.

The above mentioned drawbacks are eliminated by the connection of a metering switchboard with an integrated digital voltmeter for measuring displacements by inductive sensors according to the invention, which is based on the fact that inductive sensors, whose centers are mutually

228 603 connected and grounded and connected with resistors to Whoatstone bridges with adjustable sensitivity, connected to the relay contacts of the switch located at the place of the experiment to the input of the carrier amplifier »whose output is connected via the relay contacts to the integration digital voltmeter input and input channel the switches are connected and the address of the inductive sensors is identified by the input of the combination circuits »which output is connected to the drive winding of the relay ·

The invention of connecting a metering control panel with an integrated digital voltmeter for measuring displacements by inductive transducers makes it possible to connect it to a. input metering control panel required number of inductive sensors of small dimensions of mass, nose and small adjusting force of the core using one common universal amplifier of carrier frequency with necessary range »resp. sensitive measurement» The number of sensors depends only on the number of reserved places

The connection is schematically shown in the attached Figure ·

It is possible to connect to the control panel the input wires 1 »1 _L 1 1 až to m» SSq * jedn of the unidirectional input signals. Switching these inputs to an integrated digital voltmeter ICVM controls the input switch.

228 603 via circuits for controlling input switches OVP · Output; circuitry OVP via appropriate wires channel »input switches *

The KYP excites the sequential inductance of the coil of the input relays! 5j to S · _m · inputs J1 to a are connected to the analogue digital * voltmeter analog input * ICVM »the digital data of the analog inputs is fed from the digital output via channel D ICVM voltmeters per output unit JSVZ »to which the measured point address information is simultaneously fed from the VF output · The RJ control unit, in addition to controlling the input switch, ensures the start of the integrated digital voltmeter ICVM · data transfer and address JSV2L devices for output devices / eg · puncher · printerLarer / and other activities * Delimited are enclosed peripheral devices placed in the control panel enclosure »which is usually located several tens of meters from the measured object · For inductive sensors placed on the measured object with respect to the frequency of the supply voltage and the impedance conditions on the line is a reserved part of the input switch »with the necessary range» located at the measured object · For inductive sensors ISj up to IS _B it is n input relays / m ♦ 1 / “/ m * m / * ^{implementerOE} · for spins the output switch is usually included in P® 10 or 20 locations · Inductive sensors are supplemented with resistors Sj> j ^to £ ₂ * ^{n to} '^ beat ivory' by adjusting * resistors until the same Sensitivity for * »6 *

228 603 all sensors · light middle terminals are interconnected and grounded * After measuring the last · one-way voltage at input m via input relay channel of input switches KVp gradually connects inductive sensors in full-scale connection ISj to IS _n via input relay + 1 / ^ / m + n / ^on ZNN carrier frequency amplifier · For this purpose, a universal strain gauge device * may be used whose amplification © can be set to * corresponding to the required sensitivity and measurement range · The ZNF carrier amplifier supplies inductive sensors with AC voltage IJj / eg * with a frequency of 5000 Hz / * amplifies and demodulates the AC output voltage proportional to the magnitude and phase of the core size and direction of travel of the inductive transducer · The output of the ZNF external frequency amplifier has a unidirectional output voltage Sq * which enters 1CVM digital voltmeter * output The voltage at the input of the 1CVM digital voltmeter at the required time intervals controls the circuits to identify and combine the IA1S combination circuits. These are combinational logic circuits * that evaluate the signals on the KVP input switch channel. which as input variables · When combining circuits 1AIS identifxkujú the channel input button-KVP connected to the input of the amplifier carrier frequency ZNF ndektorá through the input relay f * _ψ appropriate induction »» 'J · »

228603 sensor * operate the relay to your contacts and _"2 connects to the input of the digital voltmeters ICVM One" apathy _Cont act _joined shield coupling Vedant ·

Vynólea can be used in construction heights · and «kéebnice for measuring displacements and deflections of models *

Claims (1)

The involvement meraoej panel and incorporate číaiioovým voltmeter to measure poauvov inductive sensors having β at Y, and the inductive sensor / ISJ and XS _n / _p of which center is each connected to uzešíňovaeím conductors and connected and resistors / R ^ to R _{2 e} n * ^P 1 ^ n / ^d ° ^ ®at 't ° novýoh m & sstikev a set of Jtteou eitlivostou * while they are connected via relay contacts / S / _m + and S _{n, φ} / switch umiestměného in place realizáe and much of the experiment at the line amplifier of the support frokvonoie / ZNF / _f the output of which is connected via the relay contacts (Z) to the input of the digital voltmeter (ICVM) and the channel of the v / k switch is connected to the input of the combination circuits identifying the address of the inductive sensors (IAIS) relay winding / Z / *