CN110646662A - Multi-channel trigger current test system and debugging and testing method thereof - Google Patents
Multi-channel trigger current test system and debugging and testing method thereof Download PDFInfo
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Abstract
The utility model provides a multichannel trigger current test system, test system includes a plurality of current sensor, a plurality of current sensor are through its sampling channel that corresponds and multichannel collection card signal connection, multichannel collection card and industrial computer signal connection, industrial computer and input, output device signal connection. The debugging process comprises the following steps: the method comprises the following three steps of building a testing device, checking a sensor and generating a trigger threshold, wherein the testing step comprises the following steps: and running two steps of testing and data integration. The design is reasonable in structural arrangement, wide-range, high-precision and long-time monitoring can be achieved, data can be automatically checked, and automation of the test process is achieved.
Description
Technical Field
The invention relates to a multi-channel trigger current test system and a debugging and testing method thereof, which are particularly suitable for improving the test precision of equipment and expanding the test range and the test time domain.
Background
The measuring technology of large current and micro-current and transient steady-state current is an important component in the field of modern automobile electronic and electrical appliances, and has great significance in ensuring the safe operation of a vehicle electrical system, improving the reliability of products, saving energy, reducing consumption and the like. The vehicle working condition current is divided into a steady-state current and a transient-state current according to the frequency characteristic current; the detection device can be divided into low-voltage small current, low-voltage large current, static current and the like according to the magnitude, the amplitude span is from mA level to over 1000A, and the detection time is from millisecond level to hour level.
The electrical components of the vehicle may have leakage current when not in operation, and may have starting pulse and locked-rotor pulse when in operation, although the wide-range current probe can be used in combination with data acquisition equipment to realize the test of electromechanical integrated components such as starter operation, electric glass lifter and the like, in the actual vehicle test, people have no consciousness and intention of completing all current tests at one time, and have the following technical difficulties: a. short-time test with large span: for example, on-gear and ACC gear current curve tests of multi-controller vehicles (leakage current is tens of mA, starting impact current is more than 10A and even more than tens of A, and steady-state current A level cannot obtain a complete electrical property curve by using common tools with both precision and measuring range). b. Long-term monitoring with large time span and unstable amplitude range: for example, leakage current and vehicle-mounted components are awakened, and long-term monitoring is activated (the leakage current is tens of mA, and the activation impact current may be several A, so that the long-term monitoring cannot be realized by common leakage current testing equipment), and long-term automatic monitoring cannot be realized by staged manual testing. c. In order to realize large-range high-precision complete electrical appliance parts and electrical property current test, different devices with various principles such as a Hall sensor, a current divider, various range current probes, a table-type universal meter, high-precision data acquisition and the like are often used, the device cost is over 60-100 ten thousand, and the investment cost is high.
The invention patent with the Chinese patent publication number of CN 108508398A and the publication date of 2018, 9 and 7 discloses a transient error testing device of a multi-channel current transformer, which comprises a main control device and a remote acquisition module; the main control device is connected with the plurality of tested analog output current transformers, the plurality of tested electronic current transformers and the reference current divider and used for acquiring signals of the current transformers and signals of the reference current divider, and the main control device sends acquired data to the upper computer. Reference shunt signals are acquired through the remote acquisition module, the main control device acquires current transformer signals, and meanwhile, a hardware triggering synchronous sampling mode is utilized, so that transient errors of the analog output current transformer and the electronic current transformer can be tested. Although this invention enables accurate measurement of current, it still suffers from the following drawbacks:
1. the tested object is a sensor, a plurality of sensors are tested simultaneously by utilizing a multi-channel device and the same signal excitation source, and the problems that the original scheme cannot be tested simultaneously, the loss is large and the testing efficiency is low due to the fact that a plurality of tests are needed are solved. The tested object and the testing principle are different from the scheme, and the method can not be applied to the technical field of the scheme.
2. The invention adopts the synchronous signal generating circuit to realize synchronous sampling of all channels after hardware triggering, and cannot realize multichannel long-time sampling experiments.
Disclosure of Invention
The invention aims to solve the problem that a multichannel long-time sampling experiment cannot be realized in the prior art, and provides a multichannel trigger current test system capable of realizing a multichannel wide-time-domain sampling experiment and a debugging and testing method thereof.
In order to achieve the above purpose, the technical solution of the invention is as follows:
a multi-channel trigger current test system comprises a current sensor and an industrial personal computer, wherein the current sensor is in signal connection with the industrial personal computer;
the test system comprises a plurality of current sensors, the current sensors are in signal connection with a multi-channel acquisition card through corresponding sampling channels of the current sensors, the multi-channel acquisition card is in signal connection with an industrial personal computer, and the industrial personal computer is in signal connection with input and output devices.
The industrial personal computer is an embedded industrial personal computer or a PC industrial personal computer;
the input and output device includes: keyboard, mouse, display, touch display.
The current sensor is a non-contact sensor.
The industrial computer comprises: the signal input end of the signal receiving unit is connected with the signal output end of the multi-channel acquisition card, the signal output end of the signal receiving unit is connected with the signal input end of the signal processing unit, the signal processing unit is in signal connection with the input and output devices, the input and output devices are in signal connection with the sensor checking unit, the signal output end of the sensor checking unit is connected with the signal input end of the trigger value estimation unit, and the trigger value estimation unit and the signal processing unit are in signal connection with the storage unit.
A debugging method of a multi-channel trigger current test system comprises the following steps:
the first step is as follows: setting up a testing device, preparing a plurality of current sensors with different measuring ranges and suitable accuracy according to the measured distance and the measured accuracy requirement of a measured object, connecting each current sensor to a single sampling channel on a multi-channel acquisition card, and connecting the multi-channel acquisition card and an industrial personal computer, wherein the setting up of the testing device is completed at this moment;
the second step is that: the sensor checking unit of the industrial personal computer checks the range and the precision of each current sensor, and when the range of each current sensor is continuous and the precision meets the precision requirement of the measured object, the input and output device sends out the passing information of the checking and enters the third step; when the measuring range of each current sensor is discontinuous and the precision does not meet the measuring range and the measuring interval required by the measured precision, the sensor checking unit sends out warning messages and type selection suggestions through the input and output devices, and then the current sensors which do not meet the requirements are replaced in the first step, and the second step is carried out again after the sensor information is recorded: checking the sensor until the checking is passed to enter a third step;
the third step: and generating a trigger threshold, after the second step of checking passes, estimating the trigger threshold by a trigger value estimation unit of the industrial personal computer, when only one current sensor covers a certain range, the range is the trigger threshold of the corresponding current sensor, when more than two current sensors simultaneously cover a certain range, the range is the trigger threshold of the current sensor with high precision, sorting and combining the trigger threshold ranges of each current sensor to obtain the final trigger threshold range of each current sensor, and storing the final trigger threshold range of each current sensor in a storage unit, wherein the debugging is completed at this moment.
A method of testing a multi-channel trigger current test system, the method comprising the steps of:
the method comprises the following steps that firstly, testing is started, each current sensor is installed on a wire to be tested, a testing device is started to test, each current sensor sends a real-time measuring signal to an industrial personal computer in the testing process, a signal receiving unit selects a signal of which the corresponding channel reaches a corresponding trigger threshold value and transmits the signal to a signal processing unit, the signal processing unit stores the signal into a storage unit, and the second step is carried out after the testing is finished;
and secondly, integrating data, namely, preliminarily combining the acquired current signals by a signal processing unit, optimizing the combined data, taking a sensor data segment with the highest precision when more than two sensors repeatedly record data segments on a certain time axis, and if the precision is consistent, taking a record numerical value corresponding to a current sensor with a smaller measuring range, and then storing the optimized result in a storage unit and outputting the result through an input device and an output device, wherein the test is finished at the moment.
Compared with the prior art, the invention has the beneficial effects that:
1. in the multi-channel trigger current test system, a channel acquisition card is connected with a plurality of current sensors with different precisions and different measuring ranges, each channel is independently triggered, the triggered channel independently records interval data, and the channel which is not triggered is in a monitoring state but does not record data, so that the expansion of the measuring ranges and the precision is realized, and the defects of a single sensor and an acquisition circuit are overcome. Therefore, multi-channel data acquisition and multi-channel triggering are realized, segmented range matching and precision calculation are carried out, and wide-range, high-precision, low-cost measurement and long-time monitoring of the current of the electrical system are realized. Therefore, the design system is reasonable in structure arrangement, and can realize wide-range, high-precision and long-time monitoring.
2. The system in the debugging method of the multi-channel trigger current testing system checks the sensor data, further checks the manually matched sensor to avoid invalid test results caused by matching errors, and automatically generates the trigger threshold value at the same time, thereby realizing the automation of the testing process. Therefore, the method can realize the checking of the range and the precision of the sensor and automatically generate the trigger threshold value, and realizes the automation of the test process.
3. In the testing method of the multi-channel trigger current testing system, each channel is independently triggered, the triggered channel independently records interval data, and the channel which is not triggered monitors the data but does not record the data, so that the expansion of measuring range and precision is realized, the defects of a single sensor and a sampling circuit are made up, and the optimization of the data precision in each time period is realized by optimizing the tested data. Therefore, the design test method is reasonable. The data accuracy is high.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a control flow diagram of the debugging method of the present invention.
FIG. 3 is a control flow diagram of the test method of the present invention.
In the figure: the device comprises a current sensor 1, an industrial personal computer 2, a signal receiving unit 21, a signal processing unit 22, a sensor checking unit 23, a trigger value estimation unit 24, a storage unit 25, a sampling channel 3, a multi-channel acquisition card 4 and an input and output device 5.
Detailed Description
The present invention will be described in further detail with reference to the following description and embodiments in conjunction with the accompanying drawings.
Referring to fig. 1 to 3, the multichannel trigger current testing system comprises a current sensor 1 and an industrial personal computer 2, wherein the current sensor 1 is in signal connection with the industrial personal computer 2;
the test system comprises a plurality of current sensors 1, the current sensors 1 are in signal connection with a multi-channel acquisition card 4 through corresponding sampling channels 3, the multi-channel acquisition card 4 is in signal connection with an industrial personal computer 2, and the industrial personal computer 2 is in signal connection with an input device and an output device 5.
The industrial personal computer 2 is an embedded industrial personal computer or a PC industrial personal computer;
the input/output device 5 includes: keyboard, mouse, display, touch display.
The current sensor 1 is a non-contact sensor.
The industrial personal computer 2 comprises: the multi-channel acquisition card comprises a signal receiving unit 21, a signal processing unit 22, a sensor checking unit 23, a trigger value estimation unit 24 and a storage unit 25, wherein a signal input end of the signal receiving unit 21 is connected with a signal output end of the multi-channel acquisition card 4, a signal output end of the signal receiving unit 21 is connected with a signal input end of the signal processing unit 22, the signal processing unit 22 is in signal connection with an input and output device 5, the input and output device 5 is in signal connection with the sensor checking unit 23, a signal output end of the sensor checking unit 23 is connected with a signal input end of the trigger value estimation unit 24, and the trigger value estimation unit 24 and the signal processing unit 22 are both in signal connection with the storage unit 25.
A debugging method of a multi-channel trigger current test system comprises the following steps:
the first step is as follows: setting up a testing device, preparing a plurality of current sensors 1 with different measuring ranges and suitable accuracy according to the measured distance and the measured accuracy requirement of a measured object, connecting each current sensor 1 to an independent sampling channel 3 on a multi-channel acquisition card 4, and connecting the multi-channel acquisition card 4 and an industrial personal computer 2, wherein the setting up of the testing device is completed at this moment;
the second step is that: the sensor is checked, the input and output device 5 is used for inputting the measuring range and the precision information of the current sensor 1 connected with each channel 3 on the multi-channel acquisition card 4 and the measured range and the measured precision requirement of the measured object to the industrial personal computer 2, the sensor checking unit 23 of the industrial personal computer 2 checks the measuring range and the precision of each current sensor 1, and when the measuring range of each current sensor 1 is continuous and the precision meets the measured precision requirement, the input and output device 5 sends out the passing information of the checking and enters the third step; when the measuring range of each current sensor 1 is discontinuous and the precision does not meet the measuring range to be measured and the measuring interval with the requirement of the measured precision, the sensor checking unit 23 sends out a warning message and a type selection suggestion through the input and output device 5, and then returns to the first step to replace the current sensor 1 which does not meet the requirement, and carries out the second step again after inputting the sensor information: checking the sensor until the checking is passed to enter a third step;
the third step: and generating a trigger threshold, after the second step of checking passes, estimating the trigger threshold by a trigger value estimation unit 24 of the industrial personal computer 2, when only one current sensor 1 covers a certain range, the range is the trigger threshold of the corresponding current sensor 1, when more than two current sensors 1 simultaneously cover a certain range, the range is the trigger threshold of the current sensor 1 with high precision, sorting and combining the trigger threshold ranges of each current sensor 1 to obtain the final trigger threshold range of each current sensor 1, and storing the final trigger threshold range of each current sensor 1 into a storage unit 25, wherein the debugging is completed at this moment.
A method of testing a multi-channel trigger current test system, the method comprising the steps of:
the method comprises the following steps that firstly, testing is started, each current sensor 1 is installed on a to-be-tested wire, a testing device is started to test, each current sensor 1 sends a real-time measuring signal to an industrial personal computer in the testing process, a signal receiving unit 21 selects a signal of which the corresponding channel reaches a corresponding trigger threshold value, the signal is transmitted to a signal processing unit 22 and stored in a storage unit 25, and the second step is carried out after the testing is finished;
and secondly, integrating data, namely, preliminarily combining the acquired current signals by the signal processing unit 22, optimizing the combined data, taking a sensor data segment with the highest precision when more than two sensors repeatedly record data segments on a certain time axis, and if the precision is consistent, taking a record numerical value corresponding to a current sensor with a smaller measuring range, storing the optimized result in the storage unit 25 and outputting the result through the input and output device 5, wherein the test is finished at the moment.
The principle of the invention is illustrated as follows:
the multi-channel acquisition card 4 is in signal connection with the industrial personal computer 2 through a PCI or PXI interface.
The current sensor 1 is a non-contact sensor. Such a design can avoid high signal-to-noise ratios brought by the space electromagnetic environment to the galvanometer measurement.
Sensor selection method and trigger setup
a. For each specific sensor, a section of measuring range with highest precision is taken
For example, the inherent accuracy of a hall current clamp sensor 1 is as follows:
| measuring range | Accuracy of measurement |
| 0- |
1％ |
| 10A-40A | 3％ |
| 40A-80A | 5％ |
| 80A-100A | 6％ |
The sensor is used only within the accuracy range of 1 percent, and the measuring range is marked as 0-10A, and the sensor is used as an alternative sensor.
b. For the object to be measured, the measuring ranges of all selected sensors need to be connected, the current transient state and steady state value ranges of the object to be measured need to be comprehensively covered, and the precision needs to meet the requirements of all sections:
| sensor numbering | Measuring range | Accuracy of measurement |
| Current sensor No. 1 | 0-450mA | 0.8％FS |
| Current sensor No. 2 | 0- |
1％FS |
| Current sensor No. 3 | 1-10A | 0.5％FS |
| Current sensor No. 4 | 10A-40A | 0.5％FS |
| Current sensor No. 5 | 10A-200A | 0.5％FS |
| Current sensor No. 6 | 10A- |
1％FS |
| Current sensor No. 7 | 200A- |
1％FS |
| Current sensor No. 8 | 200A-2000A | 1.5％FS |
| …… |
FS in the above table represents the full-scale accuracy, so the accuracies of current sensor No. 3, current sensor No. 4, and current sensor No. 5 in the above table decrease in order. Only when the precision in the range overlapping area is consistent, the situation that data in partial intervals are repeatedly recorded occurs. And (4) the above conditions are processed in a data optimization stage after testing, and if the precision in the range overlapping area is consistent, the recorded numerical value corresponding to the current sensor with the smaller measuring range is obtained. Examples are: and the data of the sensor a (1A-3A, 1% FS) and the sensor b (0A-3A, 1% FS) are overlapped in the data optimization stage 1A-3A, and the data of the sensor a is taken as test data.
c. Setting triggering threshold values of all channels of each sensor, repeating triggering of overlapping range segments, and placing in a sensor with higher actual precision:
| measuring device channel | Sensor numbering | Measuring range | Trigger |
| Channel number | |||
| 1 | Current sensor No. 1 | 0-450mA | Window trigger of 0-450mA |
| Channel number 2 | Current sensor No. 2 | 0-3A | 450mA-3A window trigger |
| Channel number 3 | Current sensor No. 3 | 1-10A | 3A-10A Window triggering |
| Channel number 4 | Current sensor No. 4 | 10A-40A | 10A-40A Window triggering |
| Channel No. 5 | Current sensor No. 5 | 10A-200A | 40A-200A Window triggering |
| Channel number 6 | Current sensor No. 6 | 10A-300A | 200A-300A Window triggers |
| Channel number 7 | Current sensor No. 7 | 200A-600A | 300A-600A Window triggering |
| Channel number 8 | Current sensor No. 8 | 200A-2000A | 600A-2000A Window triggering |
| …… | …… |
Wide time domain: the multi-channel data acquisition equipment in the current market, whether universal instruments or nonstandard equipment, or triggered by a single channel, starts to record data in each channel; or after the composite trigger condition of a plurality of channels is activated, each channel starts to record data. In this embodiment, each channel is triggered independently, the triggered channel records interval data independently, and the channel that is not triggered monitors data (determines whether to enter the triggered state in real time), but does not record data. Therefore, under the same multi-channel acquisition card hardware design condition, the longest recording time can be multiplied by several times; the greater the number of channels, the greater the longest recording time advantage over conventional schemes.
When the test is started, all channels are in a monitoring state; when one or some channels are triggered, the triggered channels record data, and the rest channels are in a monitoring state; when the acquisition signal of the triggered channel exceeds the triggering range, the current channel stops recording data and is switched into a monitoring state; after the test is stopped, the signal processing unit 22 combines the data acquired by each channel on a time axis, and if an overlapped part exists, channel data with high corresponding sensor precision is taken; and outputting the merged and optimized data as a test result.
The measured object of the scheme is a typical working condition with large current range and precision span in automobile circuits and industrial and civil electrical appliances, multi-channel data acquisition and multi-channel triggering are utilized to perform segmented range matching and precision calculation, and independent precision of each channel is used in a composite mode to realize wide-range, high-precision, low-cost measurement and long-time monitoring of the current of the vehicle-mounted and civil electrical systems.
The scheme can be used for continuous testing of leakage current, standby current, peak current and locked rotor current of tested electric appliance parts, avoids using a plurality of devices for testing in a segmented mode, saves investment and improves efficiency. The test device can be used for testing the whole process of starting, running and locked-rotor running of the motor; testing the whole process from the leakage current to the peak current of the power supply line under the typical working condition of the whole vehicle; the test was calibrated with a programmed pulse waveform of a constant current load.
Example 1:
a multi-channel trigger current test system comprises a current sensor 1 and an industrial personal computer 2, wherein the current sensor 1 is in signal connection with the industrial personal computer 2; the testing system comprises a plurality of current sensors 1, the current sensors 1 are in signal connection with a multi-channel acquisition card 4 through corresponding sampling channels 3, the multi-channel acquisition card 4 is in signal connection with an industrial personal computer 2, and the industrial personal computer 2 is in signal connection with an input and output device 5; the current sensor 1 is a non-contact sensor; the industrial personal computer 2 comprises: the multi-channel acquisition card comprises a signal receiving unit 21, a signal processing unit 22, a sensor checking unit 23, a trigger value estimation unit 24 and a storage unit 25, wherein a signal input end of the signal receiving unit 21 is connected with a signal output end of the multi-channel acquisition card 4, a signal output end of the signal receiving unit 21 is connected with a signal input end of the signal processing unit 22, the signal processing unit 22 is in signal connection with an input and output device 5, the input and output device 5 is in signal connection with the sensor checking unit 23, a signal output end of the sensor checking unit 23 is connected with a signal input end of the trigger value estimation unit 24, and the trigger value estimation unit 24 and the signal processing unit 22 are both in signal connection with the storage unit 25.
A debugging method of a multi-channel trigger current test system comprises the following steps:
the first step is as follows: setting up a testing device, preparing a plurality of current sensors 1 with different measuring ranges and suitable accuracy according to the measured distance and the measured accuracy requirement of a measured object, connecting each current sensor 1 to an independent sampling channel 3 on a multi-channel acquisition card 4, and connecting the multi-channel acquisition card 4 and an industrial personal computer 2, wherein the setting up of the testing device is completed at this moment;
the second step is that: the sensor is checked, the input and output device 5 is used for inputting the measuring range and the precision information of the current sensor 1 connected with each channel 3 on the multi-channel acquisition card 4 and the measured range and the measured precision requirement of the measured object to the industrial personal computer 2, the sensor checking unit 23 of the industrial personal computer 2 checks the measuring range and the precision of each current sensor 1, and when the measuring range of each current sensor 1 is continuous and the precision meets the measured precision requirement, the input and output device 5 sends out the passing information of the checking and enters the third step; when the measuring range of each current sensor 1 is discontinuous and the precision does not meet the measuring range to be measured and the measuring interval with the requirement of the measured precision, the sensor checking unit 23 sends out a warning message and a type selection suggestion through the input and output device 5, and then returns to the first step to replace the current sensor 1 which does not meet the requirement, and carries out the second step again after inputting the sensor information: checking the sensor until the checking is passed to enter a third step;
the third step: and generating a trigger threshold, after the second step of checking passes, estimating the trigger threshold by a trigger value estimation unit 24 of the industrial personal computer 2, when only one current sensor 1 covers a certain range, the range is the trigger threshold of the corresponding current sensor 1, when more than two current sensors 1 simultaneously cover a certain range, the range is the trigger threshold of the current sensor 1 with high precision, sorting and combining the trigger threshold ranges of each current sensor 1 to obtain the final trigger threshold range of each current sensor 1, and storing the final trigger threshold range of each current sensor 1 into a storage unit 25, wherein the debugging is completed at this moment.
A method of testing a multi-channel trigger current test system, the method comprising the steps of:
the method comprises the following steps that firstly, testing is started, each current sensor 1 is installed on a to-be-tested wire, a testing device is started to test, each current sensor 1 sends a real-time measuring signal to an industrial personal computer in the testing process, a signal receiving unit 21 selects a signal of which the corresponding channel reaches a corresponding trigger threshold value, the signal is transmitted to a signal processing unit 22 and stored in a storage unit 25, and the second step is carried out after the testing is finished;
and secondly, integrating data, namely, preliminarily combining the acquired current signals by the signal processing unit 22, optimizing the combined data, taking a sensor data segment with the highest precision when more than two sensors repeatedly record data segments on a certain time axis, and if the precision is consistent, taking a record numerical value corresponding to a current sensor with a smaller measuring range, storing the optimized result in the storage unit 25 and outputting the result through the input and output device 5, wherein the test is finished at the moment.
Example 2:
example 2 is substantially the same as example 1 except that:
the industrial personal computer 2 is an embedded industrial personal computer or a PC industrial personal computer;
the input/output device 5 includes: keyboard, mouse, display, touch display.
Claims (6)
1. The utility model provides a multichannel trigger current test system, includes current sensor (1) and industrial computer (2), current sensor (1) and industrial computer (2) signal connection, its characterized in that:
the test system comprises a plurality of current sensors (1), the current sensors (1) are in signal connection with a multi-channel acquisition card (4) through corresponding sampling channels (3), the multi-channel acquisition card (4) is in signal connection with an industrial personal computer (2), and the industrial personal computer (2) is in signal connection with an input device and an output device (5).
2. A multi-channel trigger current test system according to claim 1, wherein:
the industrial personal computer (2) is an embedded industrial personal computer or a PC industrial personal computer;
the input/output device (5) comprises: keyboard, mouse, display, touch display.
3. A multi-channel trigger current test system according to claim 1, wherein:
the current sensor (1) is a non-contact sensor.
4. A multi-channel trigger current test system according to claim 1, 2 or 3, wherein:
the industrial personal computer (2) comprises: the device comprises a signal receiving unit (21), a signal processing unit (22), a sensor checking unit (23), a trigger value estimating unit (24) and a storage unit (25), wherein a signal input end of the signal receiving unit (21) is connected with a signal output end of a multi-channel acquisition card (4), a signal output end of the signal receiving unit (21) is connected with a signal input end of the signal processing unit (22), the signal processing unit (22) is in signal connection with an input and output device (5), the input and output device (5) is in signal connection with the sensor checking unit (23), a signal output end of the sensor checking unit (23) is connected with a signal input end of the trigger value estimating unit (24), and the trigger value estimating unit (24) and the signal processing unit (22) are in signal connection with the storage unit (25).
5. A debugging method of a multi-channel trigger current test system according to any one of claims 1-4, characterized by comprising the following steps: the debugging method comprises the following steps:
the first step is as follows: the method comprises the steps of setting up a testing device, preparing a plurality of current sensors (1) with different measuring ranges and suitable accuracy according to the measured distance and the measured accuracy requirement of a measured object, connecting each current sensor (1) to a single sampling channel (3) on a multi-channel acquisition card (4), and connecting the multi-channel acquisition card (4) and an industrial personal computer (2), wherein the setting up of the testing device is completed at this time;
the second step is that: the sensor is checked, the input and output device (5) is used for inputting the measuring range and the precision information of the current sensor (1) connected on each channel (3) on the multi-channel acquisition card (4) and the measured range and the measured precision requirement of the measured object to the industrial personal computer (2), the sensor checking unit (23) of the industrial personal computer (2) checks the measuring range and the precision of each current sensor (1), and when the measuring range of each current sensor (1) is continuous and the precision meets the measured precision requirement, the input and output device (5) sends out the passing information of the checking and enters the third step; when the measuring range of each current sensor (1) is discontinuous and the precision does not meet the measuring range and the measuring interval required by the measured precision, the sensor checking unit (23) sends out warning messages and type selection suggestions through the input and output device (5), and then the current sensors (1) which do not meet the requirements are replaced in the first step, and the second step is carried out again after the sensor information is recorded: checking the sensor until the checking is passed to enter a third step;
the third step: and generating a trigger threshold, after the second step of checking passes, estimating the trigger threshold by a trigger value estimation unit (24) of the industrial personal computer (2), when only one current sensor (1) covers a certain range, the range is the trigger threshold of the corresponding current sensor (1), when more than two current sensors (1) simultaneously cover a certain range, the range is the trigger threshold of the current sensor (1) with high precision, sorting and combining the trigger threshold ranges of each current sensor (1), obtaining the final trigger threshold range of each current sensor (1), and storing the final trigger threshold range in a storage unit (25), wherein the debugging is completed at this moment.
6. A test method of the multi-channel trigger current test system set up in claim 5 is characterized in that: the test method comprises the following steps:
the method comprises the following steps that firstly, testing is started, each current sensor (1) is installed on a wire to be tested, a testing device is started to test, each current sensor (1) sends a real-time measuring signal to an industrial personal computer in the testing process, a signal receiving unit (21) selects a signal of which the corresponding channel reaches a corresponding trigger threshold value and transmits the signal to a signal processing unit (22) and stores the signal in a storage unit (25), and the second step is carried out after the testing is finished;
and secondly, integrating data, preliminarily combining the acquired current signals by a signal processing unit (22), optimizing the combined data, taking a sensor data segment with the highest precision when more than two sensors repeatedly record data segments on a certain time axis, if the precision is consistent, taking a record numerical value corresponding to a current sensor with a smaller measuring range, storing the optimized result in a storage unit (25), and outputting the result through an input and output device (5), wherein the test is finished at the moment.
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