Device and method for on-site automatic calibration of low-current meters
A calibration device and small current technology, applied in measuring devices, instruments, measuring electrical variables, etc., can solve the problems of low calibration efficiency, inconvenient portability, and large size, and achieve high precision, portability, and small size.
Inactive Publication Date: 2019-06-07
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH +1
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Problems solved by technology
[0004] In view of the above problems, the object of the present invention is to provide a device and method for on-site automatic calibration of small current instruments, which overcomes the defects of large standard equipment, inconvenient carrying, low calibration efficiency, etc. existing in existing calibration methods, and improves It has improved the automation level for on-site calibration of small current instruments such as multi-type milliampmeters and microammeters, and realized the miniaturization of on-site calibration devices for small current instruments.
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[0046] Such as figure 1 As shown, the on-site automatic calibration device suitable for small current meters in this embodiment realizes on-site automatic calibration of the 2mA range milliampere meter and the 500uA range microammeter on the test console to be calibrated. The calibrated device includes two parts: the calibration device host and the upper computer.
[0047] The host of the calibration device includes a voltage-controlled current source module, a channel switching module and an MCU control module. By designing a highly integrated program-controlled current generating device, the host of the calibration device is small in size, easy to carry, and meets the requirements of the boat.
[0048] The voltage-controlled current source module uses two pieces of OP200 to form a typical dual-op-amp voltage-controlled current source circuit. The sampling resistor makes the output current I of the current source o =U i / R s , where U i is the control voltage signal outpu...
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The invention relates to a device and a method for on-site automatic calibration of low-current meters. The device comprises a calibration device host and an upper computer which are connected througha data communication interface. A calibration program is preset in the upper computer. The upper computer sends a control instruction to the calibration device host according to the preset calibration program. After receiving the control instruction, the calibration device host executes a corresponding action and calibrates a calibrated test console to realize on-site automatic calibration of low-current meters. The invention overcomes the defects of the existing calibration methods, such as large volume and carrying inconvenience of the standard equipment and low calibration efficiency, improves the automation level of on-site calibration for low-current meters such as multiple types of milliampere meters and micro-ampere meters, and realizes the miniaturization of on-site calibration devices for low-current meters.
Description
technical field [0001] The invention relates to the technical field of electrical measurement, in particular to a device and method for on-site automatic calibration of small current meters. Background technique [0002] A variety of small current instruments such as milliampmeters and microammeters are installed on the test consoles of various ships. The accuracy of these instruments is related to the performance of important equipment on the ship. In most cases, these instruments are not allowed Disassembly can only be performed on-site measurement through the reserved instrument input interface, which requires the current standard equipment to be miniaturized to meet the requirements of on-site measurement. [0003] In the prior art, a desktop high-precision current source is usually used to realize the measurement of the current meter, which is too large, inconvenient to carry, low in efficiency, and difficult to meet the requirements of on-site measurement. In order to ...
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IPC IPC(8): G01R35/00
Inventor 王兵张鹏程高翌春刘晓旭印朝辉张修建张铁犁
Owner BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH