Anti-interference capacitive densitometer

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adopts double shielded cable capacitance density meter and the lead of the thermometer, because: aldehyde line outsourcing has a metal shield, only cable core is not covered by the shield part asked capacitance, and the original capacitance between the two core is divided into between conductor and shield inside, inside and outside the shielding layer between q and outer shield and ground capacitance. Nitrogen plasma density meter and the cable of the thermometer is about 2 m long, conductor para fB generally less than 5 cm the length of the shield, so both j asked volume line capacitance is significantly reduced. 05 p magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

but both the inside and outside of the cable shielding layer of bulk shielding method is adopted to improve the connection, the conductor and the shielding layer, inner and outer shield asked the parasitic capacitance in series and then work on first measured capacitance, the equivalent send cattle capacitance value is greatly reduced. 05 p magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

so, double shielded cable asked two line parasitic capacitance is far less than ordinary wire under the same length. Whole screen method not only reduces the parasitic capacitance, also make the parasitic capacitance in the complex experiment environment to remain relatively stable, so as to improve the resolution of the star system. Measuring the anti-interference ability of the line can be estimated according to the interference voltage on the capacitor being measured. 5 l。 05 p magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

when length is 2 m of ordinary wire and double shielded cable with the voltage of & permil; The interference sources, the LCR meter is used to determine the magnitude of each parasitic capacitance and can estimate f { __ { The measured capacitance (when a double shielded cable is used The density meter & lsquo; J level & uml; ‘ Detection electrode capacitance) The interference voltage and at least one order of magnitude lower than a normal conductor, that is to say, measuring circuit I: interference is much smaller. Therefore, theoretical analysis, USES the double layer shielding cable and shielding method not only reduces the overall line parasitic capacitance and keep its stable value, also enhance the anti-jamming ability of the measuring circuit, so as to improve the measurement sensitivity and resolution. 05 p magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

05 p magnetic flap | | glass thermometer thermometer floating ball | | glass thermometer thermometer two-color thermometer

05 p magnetic flap | | glass thermometer thermometer floating ball thermometer | | double color glass thermometer thermometer