33results about How to "Meet the verification requirements" patented technology

The invention relates to a multifunctional mutual inductor checking instrument, belonging to the electronic power unit technical field. The checking instrument comprises a signal conditioning box and an upper machine, wherein, the signal conditioning box comprises two precision voltage mutual inductors, two precision current mutual inductors, a signal acquisition unit, a control unit, a power supply module, a prior voltage mutual inductor connector, a standard voltage mutual inductor connector, a prior current mutual inductor connector, a standard current mutual inductor connector, an electronic voltage mutual inductor analog quantity connector, an electronic current mutual inductor analog quantity connector and two electronic voltage or current mutual inductor digital quantity connectors. The multifunctional mutual inductor checking machine can check the prior mutual inductor, the electronic mutual inductor with an analog quantity output and the electronic mutual inductor with a digital quantity output and can satisfy the checking requirements of the prior mutual inductor.

The invention discloses a quick connection switching device for pressure transmitter calibration, which comprises a sealing connection base, a multi-way switching gas core and an end driving mechanism. The sealing connection base includes a tube body and a through tube The seat body of the body, the interior of the tube body is hollow, the seat body is connected and fixed with the pressure transmitter, and the air source channel connected with the air inlet of the pressure transmitter is opened on the seat body; the multi-way switching gas core Installed in the pipe body, the multi-channel switching gas core is a variable-diameter pipe section structure, including a small-diameter pipe section and a large-diameter pipe section separated by a partition ring. The outer wall of the small-diameter pipe section and the inner wall of the sealed connection base pipe body constitute the production gas cavity; the large-diameter pipe section is provided with a calibration air chamber connected to the calibration gas path, and the calibration air chamber is provided with a radial air outlet; the end driving mechanism is connected to the outer end of the large-diameter pipe section. The beneficial effects of the present invention are: the present invention realizes quick connection and switching between the production gas circuit and the calibration gas circuit, and can quickly complete the calibration work of the pressure transmitter.

The invention discloses a wind tunnel calibration method for a large-flow gas pipeline uniform velocity tube flowmeter. The flowmeter to be calibrated is tested in the wind tunnel test section to obtain the flow velocity coefficient of the flowmeter, and then combine the velocity distribution correction coefficient to obtain the flow coefficient of the flowmeter. In this calibration method, regardless of the length of the flowmeter, as long as it is smaller than the section size of the wind tunnel, it can be inserted into the calibration section for calibration, and the equipment has good versatility. The velocity distribution correction coefficient needs to be measured and accumulated in the database through experiments on a special experimental system. The velocity distribution correction coefficient experimental system is equipped with two calibration sections, the wind tunnel test section and the fully developed pipe flow test section. Under the same flow rate, the flowmeter to be calibrated is located in the wind tunnel test section and the fully developed pipe flow test section respectively. Measurements are made to obtain velocity profile correction factors. The speed distribution correction coefficient obtained by the invention has high accuracy and high data reliability.

The invention relates to an electronic transformer verifying device. The electronic transformer verifying device aims to solve the problems that the conventional transformer verifying device lacks a corresponding digital interface and cannot verify an electronic transformer. The electronic transformer verifying device comprises a standard electronic transformer group, a standard merging unit, a signal conditioning box, an industrial computer, a merging unit interface, an analog quantity input interface and an optical pulse expansion interface. The signal conditioning box comprises a No.1 optical fiber transceiver, a No.2 optical fiber transceiver, an over-voltage protection circuit, a data acquisition card and an optical pulse expansion circuit; the industrial computer is provided with a No.1 electric ethernet port, a No.2 electric ethernet port and a peripheral component interconnect (PCI) bus interface; and the standard electronic transformer group can consist of a single standard electronic transformer or a plurality of standard electronic transformers according to different application occasions. The electronic transformer verifying device is applied in the field of verification of transformers for electric power systems.

The invention belongs to the technical field of checking devices, and more particularly relates to a measuring tool for a three-coordinate measuring machine. The prior art has the defects that the size of the wide-range three-coordinate measuring machine can not be checked and the checking efficiency is low. In order to overcome the defects in the prior art, the invention provides a technical scheme that the measuring tool comprises a standard ball part and a standard ball supporting part, wherein the standard ball part comprises a plurality of standard balls arranged on the same line; the standard balls are mutually connected by connecting rods; the standard balls and the connecting rods are detachably connected; the standard ball supporting part consists of a plurality of supporting pipes which are connected on the same line in an end-to-end manner; the supporting pipes are in detachable connection; and the standard ball parts and the standard ball supporting parts are arranged in parallel and are connected by a plurality of supporting pieces. The measuring tool measuring tool can be convenient to meet the stroke checking of various large-range three-coordinate measuring machines.