CN109901089B - Calibration system of digital unit tester - Google Patents
Calibration system of digital unit tester Download PDFInfo
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- CN109901089B CN109901089B CN201811558169.3A CN201811558169A CN109901089B CN 109901089 B CN109901089 B CN 109901089B CN 201811558169 A CN201811558169 A CN 201811558169A CN 109901089 B CN109901089 B CN 109901089B
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Abstract
The invention relates to a calibration system of a digital unit tester, which comprises a bus measurement and control host, an electrical standard source, a signal adaptation box, a standard resistance box and a safety mechanism equivalent device, wherein the bus measurement and control host comprises a controller module, a digital multimeter module, an oscilloscope module and a data communication module; the controller module controls the electrical standard source and the signal adaptation box to execute corresponding actions, acquires corresponding voltage and current data or acquires waveforms through the digital multimeter module or the oscilloscope module to measure time between corresponding conversion points, and controls the electrical standard source to output high resistance and controls the signal adaptation box to realize the calibration of the insulation resistance; the digital multimeter module realizes the calibration of the test current; the oscilloscope module realizes the calibration of the power-on time and the state conversion time; the data communication module realizes data interaction and driving control of the controller module on the signal adaptation box; the standard resistance box realizes the calibration of the contact resistance and the coil resistance; the safety mechanism equivalent provides an equivalent load for calibration.
Description
Technical Field
The invention relates to the technical field of metering of special test equipment, in particular to a calibration system of a digital unit tester.
Background
The safety mechanism is a key part of the solid rocket engine and has a safety state and a working state: when the explosion-proof device is in a safety state, even if accidental ignition is caused by misoperation, the explosion-proof device can isolate the detonating cord from the electric explosion tube, and the ignition and explosion propagation functions are stopped, so that accidental ignition of the engine is avoided; when the explosion-propagation device is in a working state, the smooth completion of the explosion-propagation process can be ensured; and the two states can be converted on the ground or in the air according to the requirements, so that the insurance is relieved. The digital unit tester is mainly used for testing various performances of the safety mechanism, and the accuracy and reliability of the values of the digital unit tester influence the safety of the rocket engine.
At present, aiming at the calibration of a digital unit tester, various desk-top instruments are adopted as standards in the prior art, the calibration of the digital unit tester is completed item by item in a manual mode, the calibration efficiency is low, the operation is extremely complex, the requirement on the skill of a calibrator is high, the test result is easy to introduce human errors, and the requirement on the comprehensive guarantee of a rocket engine is difficult to meet.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a calibration system for a digital unit tester, which can achieve semi-automatic calibration of the digital unit tester, simplify operations, improve efficiency, and avoid introducing human errors.
In order to achieve the purpose, the invention adopts the following technical scheme: a calibration system of a digital unit tester is characterized by comprising a bus measurement and control host, an electrical standard source, a signal adaptation box, a standard resistance box and a safety mechanism equivalent device, wherein the bus measurement and control host comprises a bus controller module, a digital multimeter module, an oscilloscope module and a data communication module; the bus controller module controls the electrical standard source and the signal adaptation box to execute corresponding actions according to the requirements of a calibration process through the data communication module, acquires corresponding voltage and current data or acquires waveforms according to the requirements of the calibration process through the digital multimeter module or the oscilloscope module to measure the time between corresponding conversion points, controls the electrical standard source to output high resistance, and controls the signal adaptation box to realize the calibration of the insulation resistance of each channel of the digital unit tester; the digital multimeter module realizes the calibration of the test current of each channel of the digital unit tester; the oscilloscope module realizes the calibration of the power-on time and the state conversion time of each channel of the digital unit tester; the data communication module is provided with a plurality of communication interfaces, and realizes data interaction and driving control of the bus controller module on the signal adaptation box; the standard resistance box realizes the calibration of the contact resistance and the coil resistance of each channel of the digital unit tester; the safety mechanism equivalent provides an equivalent load for calibration of the digital unit tester.
Preferably, when calibrating the contact resistance, the coil resistance and the test current of each channel of the digital unit tester, the calibration system connects the test socket of the digital unit tester with the two terminals of the standard resistor box, and connects the two terminals of the standard resistor box with the voltage measuring end of the digital multi-purpose meter module.
Preferably, the calibration system is configured to calibrate the contact resistance and the coil resistance of each channel of the digital unit tester by adjusting the resistance values of different calibration points output by the standard resistance box according to the requirements of a calibration process, and then completing the calibration of the contact resistance and the coil resistance of each channel of the digital unit tester one by the digital multimeter module.
Preferably, the calibration of the test current of each channel of the digital unit tester is realized by measuring the voltage between two binding posts of the standard resistance box by the digital multimeter module and then calculating the test current of each channel of the digital unit tester.
Preferably, when the calibration system calibrates the insulation resistance, the power-up time and the state conversion time of each channel of the digital unit tester, the data communication module is respectively connected with the input ends of the electrical standard source and the signal adaptation box, the output ends of the safety mechanism equivalent device, the oscilloscope module and the electrical standard source are respectively connected with the input end of the signal adaptation box, the output end of the signal adaptation box is connected with the test socket of the digital unit tester, and the signal switching of each channel of the digital unit tester is realized by a switching circuit in the signal adaptation box; and the voltage measuring end of the digital multimeter module is connected with a wiring terminal of the digital unit tester.
Preferably, the calibration system for the insulation resistance of each channel of the digital unit tester controls the electrical standard source to output the resistance of different calibration points through the bus test and control device module, controls the signal adaptation box to switch the channels, and then sends the output resistance to each channel of the digital unit tester, so as to realize the automatic calibration of the insulation resistance of each channel of the digital unit tester.
In the calibration system, preferably, the calibration of the power-up time of each channel of the digital unit tester is performed by automatically measuring the actual value T of the power-up time through the oscilloscope module when the digital unit tester starts to perform state transition1 factThe window display value of the digital unit tester is a power-on time display value T1 showsAnd repeating the test for a plurality of times, and then selecting the power-on time indication T from all the test data1 showsWith the actual value of the power-on time T1 factThe point with the largest difference is the error calibration result delta of the time at power-upT1。
Preferably, the calibration of the state transition time of each channel of the digital unit tester is to stop measuring after 200ms control power-on pulse and the falling edge of the working switch waveform are automatically measured by the oscilloscope module when the digital unit tester starts to execute state transition; then the bus controller module automatically calculates the time interval between the rising edge of the control power-on pulse and the first falling edge of the working switch waveform, and the time interval is the actual value T of the state transition time2 fact(ii) a The window display value of the digital unit tester is a state transition time indication value T2 showIndication of state transition time T2 showAnd the actual value of the state transition time T2 factThe difference is the absolute error delta of the state transition timeT2。
The calibration system preferably further comprises a bus case, the bus controller module, the digital multimeter module, the oscilloscope module and the data communication module are all bus-type board cards, and all the modules are inserted into the bus case to form the portable bus measurement and control host.
Preferably, the bus of the calibration system is any one of a PXI bus, a PXIe bus, a CPCI bus and a VXI bus.
Due to the adoption of the technical scheme, the invention has the following advantages: the calibration system of the digital unit tester provided by the invention not only realizes semi-automatic calibration of the digital unit tester, simplifies operation and improves efficiency, but also can avoid introducing human errors.
Drawings
FIG. 1 is a digital unit tester calibration connection diagram according to a first embodiment of the present invention;
FIG. 2 is a digital unit tester calibration connection diagram according to a second embodiment of the present invention;
fig. 3 is a waveform diagram of the state transition time of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
As shown in fig. 1 and fig. 2, the calibration system of the digital unit tester provided in this embodiment includes a bus measurement and control host, an electrical standard source, a signal adaptation box, a standard resistance box, and a safety mechanism equivalent device, and the bus measurement and control host includes four parts, namely a bus controller module, a digital multimeter module, an oscilloscope module, and a data communication module.
The bus controller module controls the electrical standard source and the signal adaptation box to execute corresponding actions according to the requirement of a calibration process through the data communication module, acquires corresponding voltage and current data or acquires waveforms according to the requirement of the calibration process through the digital multimeter module or the oscilloscope module to measure the time between corresponding conversion points, controls the electrical standard source to output high resistance, and controls the signal adaptation box to realize the calibration of the insulation resistance of each channel of the digital unit tester; the digital multimeter module realizes the calibration of the test current of each channel of the digital unit tester; the oscilloscope module realizes the calibration of the power-on time and the state conversion time of each channel of the digital unit tester; the data communication module is provided with a plurality of communication interfaces, and data interaction and driving control of the bus controller module to the signal adaptation box are achieved.
And the standard resistance box realizes the calibration of the contact resistance and the coil resistance of each channel of the digital unit tester. The safety mechanism equivalent provides an equivalent load for calibration of the digital unit tester.
The first embodiment is as follows:
as shown in fig. 1, when calibrating the contact resistance, coil resistance and test current of each channel of the digital unit tester, the test socket of the digital unit tester is connected to the two terminals of the standard resistance box, and the two terminals of the standard resistance box are connected to the voltage measuring terminal of the digital multimeter module.
In this embodiment, preferably, the calibration of the contact resistance and the coil resistance of each channel of the digital unit tester is to adjust the resistance values of different calibration points output by the standard resistance box according to the requirement of the verification process, and then complete the calibration of the contact resistance and the coil resistance of each channel of the digital unit tester item by item through the digital multimeter module.
In this embodiment, preferably, the calibration of the test current of each channel of the digital unit tester is implemented by measuring the voltage between two terminals of the standard resistance box by the digital multimeter module and then implementing the calibration of the test current of each channel of the digital unit tester by calculation.
Example two:
as shown in fig. 2, when calibrating the insulation resistance, the power-up time and the state transition time of each channel of the digital unit tester, the data communication module is respectively connected with the input ends of the electrical standard source and the signal adaptation box, the output ends of the safety mechanism equivalent device, the oscilloscope module and the electrical standard source are all connected with the input end of the signal adaptation box, the output end of the signal adaptation box is connected with the test socket of the digital unit tester, and the signal switching of each channel of the digital unit tester is realized by the switching circuit in the signal adaptation box; and the voltage measuring end of the digital multimeter module is connected with a wiring terminal of the digital unit tester.
In this embodiment, preferably, the calibration of the insulation resistance of each channel of the digital unit tester is implemented by controlling the electrical standard source to output the resistance of different calibration points through the bus test controller module, controlling the signal adaptation box to switch the channels, and then sending the output resistance to each channel of the digital unit tester, so as to implement the automatic calibration of the insulation resistance of each channel of the digital unit tester.
In this embodiment, it is preferable that the calibration of the power-on time of each channel of the digital unit tester is performed by automatically measuring the actual value T of the power-on time by the oscilloscope module when the digital unit tester starts to perform the state transition1 factThe window display value of the digital unit tester is a power-on time display value T1 showsAnd repeating the test for a plurality of times, and then selecting the power-on time indication T from all the test data1 showsWith the actual value of the power-on time T1 factThe point with the largest difference is the error calibration result delta of the time at power-upT1。
In this embodiment, preferably, the calibration of the state transition time of each channel of the digital unit tester is to stop the measurement after the digital unit tester automatically measures the falling edge of the control power-on pulse and the working switch waveform of 200ms by the oscilloscope module when the digital unit tester starts to perform the state transition; then the bus controller module calculates the time interval between the rising edge of the control power-on pulse and the first falling edge of the working switch waveform automatically, and the time interval is the actual value T of the state transition time2 fact(ii) a The window display value of the digital unit tester is a state transition time indication value T2 showIndication of state transition time T2 showAnd the actual value of the state transition time T2 factThe difference is the absolute error delta of the state transition timeT2。
In the above embodiment, preferably, the bus measurement and control host further includes a bus chassis, and the bus controller module, the digital multimeter module, the oscilloscope module, and the data communication module are all bus-type board cards, and each module is inserted into the bus chassis to form the portable bus measurement and control host.
In the above embodiment, the bus may preferably be any one of a PXI bus, a PXIe bus, a CPCI bus, and a VXI bus.
The following description will be made by taking the calibration of the contact resistance and the test current of the 1-channel fuse switch as an example, and the steps are as follows:
the method comprises the following steps: connecting instrument equipment according to the figure 1, then operating on a digital unit tester, and entering a 1-channel safety switch contact resistance test item;
step two: selecting calibration points which are respectively 0.05 omega, 0.21 omega, 0.41 omega, 0.61 omega, 0.81 omega and 1.01 omega;
step three: manually adjusting the standard resistance box to enable the output value of the standard resistance box to be the value of each calibration point in sequence, recording the value as an actual value, pressing a 'confirmation' key by the digital unit tester, respectively carrying out two times of measurement in a process and a return stroke, and then selecting the point with the maximum difference between the indication value and the actual value from all measurement data as the calibration result of the contact resistance;
step four: selecting a test gear of direct current voltage 100mV in an interface program of a digital unit tester;
step five: manually adjusting the standard resistance box to make its output value 1 omega, pressing the 'confirm' key, and automatically measuring the voltage value between two ends of the standard resistance box to be U by controlling the digital multimeter moduleR1The ratio of the voltage value to 1 omega is the test current calibration result IR1。
The following description will take the calibration of the transition time from the 1-channel fuse state to the working state as an example, and the steps are as follows:
the method comprises the following steps: connecting instrument equipment according to the figure 2, then operating on the digital unit tester, and entering a '1 channel insurance state conversion to working state conversion time calibration' item;
step two: operating built-in check software on the digital unit tester, entering a channel 1 voltage selection and conversion window, selecting 28.5V as conversion voltage, converting the channel state of the safety mechanism equivalent device 1 into a safety state after confirmation,
step three: pressing down a 'working' key on a front panel of the digital unit tester, converting the channel state of the safety mechanism equivalent device 1 from a safety state to a working state, automatically measuring by an oscilloscope module at the moment, and automatically stopping measuring after 200ms of measurement controls the power-on pulse and the falling edge of the waveform of a working switch;
step four: the time interval between the rising edge of the control power-on pulse and the first falling edge of the working switch waveform which is automatically measured and recorded is the actual value T of the switching time for switching the 1-channel fuse state to the working state2 factThe waveform is shown in fig. 3; window 'information' menu display conversion time of digital unit tester to state conversion time indication value T2 showIndication of state transition time T2 showAnd the actual value of the state transition time T2 factThe difference is the absolute error delta of the state transition timeT2。
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (3)
1. A calibration system of a digital unit tester is characterized by comprising a bus measurement and control host, an electrical standard source, a signal adaptation box, a standard resistance box and a safety mechanism equivalent device, wherein the bus measurement and control host comprises a bus controller module, a digital multimeter module, an oscilloscope module and a data communication module;
the bus controller module controls the electrical standard source and the signal adaptation box to execute corresponding actions according to the requirements of a calibration process through the data communication module, acquires corresponding voltage and current data or acquires waveforms according to the requirements of the calibration process through the digital multimeter module or the oscilloscope module to measure the time between corresponding conversion points, controls the electrical standard source to output high resistance, and controls the signal adaptation box to realize the calibration of the insulation resistance of each channel of the digital unit tester;
the digital multimeter module realizes the calibration of the test current of each channel of the digital unit tester;
the oscilloscope module realizes the calibration of the power-on time and the state conversion time of each channel of the digital unit tester;
the data communication module is provided with a plurality of communication interfaces, and realizes data interaction and driving control of the bus controller module on the signal adaptation box;
the standard resistance box realizes the calibration of the contact resistance and the coil resistance of each channel of the digital unit tester;
the safety mechanism equivalent device provides equivalent load for the calibration of the digital unit tester;
when the contact resistance, the coil resistance and the test current of each channel of the digital unit tester are calibrated, connecting a test socket of the digital unit tester with two binding posts of the standard resistance box, and simultaneously connecting the two binding posts of the standard resistance box with a voltage measuring end of the digital multimeter module; the calibration of the contact resistance and the coil resistance of each channel of the digital unit tester is to adjust the resistance values of different calibration points output by the standard resistance box according to the requirements of a calibration flow, and then the digital multi-purpose meter module finishes the calibration of the contact resistance and the coil resistance of each channel of the digital unit tester one by one; the calibration of the test current of each channel of the digital unit tester is realized by measuring the voltage between two binding posts of the standard resistance box by the digital multimeter module and then calculating the calibration of the test current of each channel of the digital unit tester;
when the insulation resistance, the power-on time and the state conversion time of each channel of the digital unit tester are calibrated, the data communication module is respectively connected with the input ends of the electrical standard source and the signal adaptation box, the output ends of the safety mechanism equivalent device, the oscilloscope module and the electrical standard source are respectively connected with the input end of the signal adaptation box, the output end of the signal adaptation box is connected with a test socket of the digital unit tester, and the signal switching of each channel of the digital unit tester is realized by the signal adaptationA switching circuit inside the box; the voltage measuring end of the digital multimeter module is connected with a wiring terminal of the digital unit tester; the calibration of the insulation resistance of each channel of the digital unit tester is realized by controlling the resistance of the electrical standard source to output different calibration points through the bus test and control module, controlling the signal adaptation box to switch the channels and then sending the output resistance to each channel of the digital unit tester; the calibration of the power-on time of each channel of the digital unit tester is to automatically measure the actual value T of the power-on time by the oscilloscope module when the digital unit tester starts to execute the state conversion1 factThe window display value of the digital unit tester is a power-on time display value T1 showsAnd repeating the test for a plurality of times, and then selecting the power-on time indication T from all the test data1 showsWith the actual value of the power-on time T1 factThe point with the largest difference is the error calibration result delta of the power-on timeT1(ii) a The calibration of the state transition time of each channel of the digital unit tester is to stop the measurement after the digital unit tester automatically measures the 200ms control power-on pulse and the falling edge of the working switch waveform through the oscilloscope module when the digital unit tester starts to execute the state transition; then the bus controller module automatically calculates the time interval between the rising edge of the control power-on pulse and the first falling edge of the working switch waveform, and the time interval is the actual value T of the state transition time2 fact(ii) a The window display value of the digital unit tester is a state transition time indication value T2 showIndication of state transition time T2 showAnd the actual value of the state transition time T2 factThe difference is the absolute error delta of the state transition timeT2。
2. The calibration system of claim 1, wherein the bus measurement and control host further comprises a bus chassis, and the bus controller module, the digital multimeter module, the oscilloscope module and the data communication module are all bus board cards, and each module is inserted into the bus chassis to form the portable bus measurement and control host.
3. The calibration system according to claim 1, wherein the bus is any one of a PXI bus, a PXIe bus, a CPCI bus and a VXI bus.
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| CN110285847A (en) * | 2019-07-18 | 2019-09-27 | 北京电子工程总体研究所 | A kind of measurement auxiliary device and metering method of test macro |
| CN112711245A (en) * | 2020-12-18 | 2021-04-27 | 深圳市道通科技股份有限公司 | Calibration method and device for automobile diagnosis equipment and computing equipment |
| CN112526439A (en) * | 2020-12-25 | 2021-03-19 | 贵州航天计量测试技术研究所 | Standard voltage/charge converter calibration device |
| CN113126014B (en) * | 2021-04-14 | 2024-04-02 | 中国工程物理研究院计量测试中心 | Calibration system for realizing array parallelism of digital oscilloscope |
| CN113884962A (en) * | 2021-09-23 | 2022-01-04 | 刘正祥 | Automatic metering and calibrating device of track insulation measuring instrument based on image recognition |
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