Application of High Speed ​​Digitizer in Electronic Time Fuze Universal Test System
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Solution Electronic time fuze The universal test system uses the industrial control computer as the system development platform, uses ADLINK's PCI-9846 high-speed digitizer as the signal acquisition module, uses the graphical programming software LabVIEW to carry out the test process control, data analysis and judgment. The development of user interface, with the PCI-7230 isolated digital input and output card, PCI-7250 relay output card signal control module, special signal conditioning circuit, digital program-controlled power supply, to achieve a universal, modular electronic time fuze automation test system, It can complete the real-time measurement and evaluation of the electrical properties such as set waveform, working voltage, current, power consumption, input and output signals of electronic time fuze products.
Electronic time fuze is a widely used fuze product that is used to provide control signals for the opening of cartridges of submunitions. It is the main equipment of remote suppression weapon systems. Electronic time fuze as a kind of highly integrated electronic fuze, its working performance must pass rigorous test, can offer users to use. Therefore, various electronic time fuze products are equipped with dedicated test instruments to complete performance tests. However, the traditional instrument test modes used in the past have revealed problems such as low efficiency, poor accuracy, and low detection rate due to the development of electronic time fuze technology. However, there is no versatility and interchangeability between test equipments of various types of electronic time fuzes. Therefore, it is urgent to design a new universal test system to solve these problems.
1. Working principle of electronic time fuze and test system requirements Electronic time fuze is used to provide explosive fire signals for sub-mother munitions. Its working principle is: First, the ammunition is set by the parameter setter before it is fired. Control system to solve the effect of the opening time, after the launch of ammunition, electronic time fuze to start with the launch time as a starting point, when the time to pre-set the role of time, the output of the opening fire signal to the warhead, complete ammunition detonation.
According to the working principle of electronic time fuze, the basic requirements for a universal test system are as follows:
Multiple adjustable DC voltage regulators are provided to provide working power for electronic time fuzes and setters.
Provides simulated fire control signals that control the operation of the setter.
Electronic time fuze and setter work can be controlled according to the actual working sequence.
Analog time modification signal can be provided.
Can provide simulated load for the tested product.
Multiple analog and digital signals can be acquired.
The test data can be analyzed, processed, displayed, stored and automatically generated test reports, including the role of time, working voltage, operating current, ignition signal amplitude, fault status.
2. The design of the scheme is based on the deficiency of the original electronic time fuze test system. It is hoped that the new test scheme can achieve the following effects:
Highly integrated, minimizes space, and is easy to move.
Automate to minimize the impact of human factors on product test results.
Versatility, can adapt to different types of electronic time fuze and setter product testing, reduce repetitive development work.
High-efficiency, single-shot test time is as short as possible to meet the requirements for mass production.
With high detection rates, intermediate parameters of the tested product can also be tested to increase coverage.
According to the working characteristics of the electronic time fuze and the requirements for automation and general use, the virtual instrument technology is in line with the requirements of the program, and it can well achieve the desired effect of the program. ADLINK's extensive line of virtual instrumentation test and measurement products can provide us with a large selection space. LabVIEW is an easy-to-use and easy-to-use development software that can be used to develop complex, parallel, effective and rapid Easy to operate test system. In order to reduce the cost of the system, we decided to choose the way of IPC plus PCI board, and through the expansion of USB ports, serial ports, and other module units for data exchange and testing, to develop a new test system under the LabVIEW software platform. The overall program design is shown in Figure 1, where: 
The digital program-controlled power supply is used to provide the working power for the electronic time fuse and the setter to be tested. It has 4 programmable and 4 fixed voltage outputs, and the output voltage range is -12V to +36V. The industrial computer can pass the serial interface. It is programmed so that its output voltage meets the operating power requirements of different models of electronic time fuses and setters.
The waveform monitoring of the input and output signals of the fuses, such as setting signals, starting signals, ignition signals, operating voltages, and operating currents, are all collected by the PCI-9846 high-speed digitizer.
Digital control signals such as electronic time fuses and starter control of the setter, mode control, etc., as well as the monitoring of various types of intermediate signals during operation of the fuses and setters, are accomplished by the PCI-7230 isolated digital input/output card.
The working power supplied to the tested product is controlled by the relay output of the PCI-7250 relay output card.
The signal conditioning circuit is mainly to adjust the electronic time fuse and the various signal of the setter to the range that the test board can accept. Such as the signal pull-up, pull-down matching; all types of switches normally open, normally closed contact matching; analog, digital, pulse level voltage modulation; signal filtering, amplification and other modulation.
The test product is connected with the universal test system through a special test cable. When testing different types of electronic time fuses and setter products, it is sufficient to replace the test cable and call the corresponding test software and parameter settings.
Realization of hardware and software of key modules 1) Testing of parameters setting function Electronic time fuze In order to meet the requirements of quick response, in order to meet the requirements of rapid response, it is necessary to transmit as much data information as possible in as little time as possible. The length should not be too long. The shortest pattern length is a microsecond signal, and in some specific use environments, the parameter setting work continues with the work of the weapon system until the ammunition is fired. When carrying out the reliability test of the product, a long-term continuous set test is required. From the features listed above for performing functional tests of parameter setting, it can be seen that the key to completing this test is that the test system must have both high sample rate and long data storage time.
ADLINK's PCI-9846 high-speed digitizer is a 4-channel high-speed data acquisition device with a sampling rate of 40 MS/s per channel and a sampling resolution of 16 bits, which can meet the real-time high precision of set signal waveforms. Acquisition, and it is equipped with up to 512MB of on-board memory, freed from the bandwidth limitations of the PCI bus, allowing it to store longer waveforms, meeting the requirements for the use of large-capacity data storage when performing continuous setup reliability tests.
The input impedance of the PCI-9846 digitizer is 50Ω or 1MΩ, and the input range is ±1V or ±5V. Both of the above parameters can be adjusted by software. Therefore, the digital signal set product can be directly collected and processed. Because the set signal amplitude may exceed the digitizer's input range, the signal conditioning circuit will divide the analog signal and convert it to ±5V for acquisition.
When setting the performance test, the main control program first determines the output working voltage according to the model of the tested product, and controls the output power to the tested product through the relay on the PCI-7250 relay output card, and then sends the set parameters through the serial port. To the setter, and then run the data acquisition subroutine (see Figure 2), the data acquisition subroutine controls the digitizer to start collecting the characteristic signals output by the signal conditioning circuit, one channel records the set signal waveform, and one channel detects the working power supplied to the product. Signal, a channel to detect the product's operating current signal, at the same time through the PCI-7230 on the digital output port to send a start signal to the setter, after detecting the set signal is sent, the system stops signal acquisition, start to collect the signal The data is analyzed and processed, and the parameters such as amplitude, code width, duty ratio, working voltage and operating current of the set signal are measured, and a determination result is given according to the product performance index. 
For the continuous set-up function test, the main control program starts the signal acquisition subroutine and continuously sends the start control signal to the setter through the PCI-7230 to control the setter. The entire test cycle is repeated 10,000 times. While the setter continuously sends the set signal, the test system continuously collects the signal waveforms and the working voltage, operating current and other parameters of the test fuse setting line, and the main control program collects the waveform data from the digitizer board in real time. Read and store in on-board memory. After the end of the entire test process, the main control software stops data acquisition, reads back the stored data, performs analysis and processing, displays the restored waveform signal, and performs performance on each assembled signal. Analyze, judge the reliability of the parameter setting, and give statistical results. The data analysis and processing interface is shown in Figure 3. 
2) Test of the timing accuracy of the electronic time fuze The timing of the electronic time fuze refers to the difference between the time from when the timing start signal is received to when the ignition signal is output. The timing accuracy of the fuze is based on the different application backgrounds of different types of fuzes. The range of timing and timing is different, and the difference is very large. For the electronic time fuze of the ultra-close-range interception type ammunition, the timing accuracy must reach a subtle level, and the time length is more than 100 milliseconds. The most important one is when timing precision test is performed. The sampling rate should be high enough, and the electronic time fuze used for the remote suppression weapon system has a timing accuracy of the order of milliseconds, but the timing length should be more than 400 seconds. When it is tested, the sampling rate can be appropriately reduced to meet the long Time data collection requirements.
According to the above characteristics, when the timing accuracy test of different types of electronic time fuses is performed, the sampling rate of the digitizer can be controlled by software, ranging from 1 MS/s to 40 MS/s, and it also saves on the premise of ensuring the accuracy of time testing. System resources.
When timing accuracy test is performed, the main control program first determines the operating supply voltage to be provided to the tested product according to the model of the product under test, and then controls the output to the tested product through the relay output card, then runs the data acquisition subroutine and sends Start the control signal to the fuse to be tested, start the timing of the fuse to be tested, and the test system synchronously monitors the start control signal, ignition output signal, working voltage and working current of the tested fuze. After the ignition signal is detected, the signal acquisition is stopped, and Analysis and processing of the collected data, from the start of the start signal to the ignition signal output time is the timing of the fuse, but also the analysis of the fuse ignition signal waveform, the maximum voltage of the ignition signal measurement, the ignition signal The waveform is integrated, and it is judged whether the parameters such as the amplitude and energy of the ignition signal output from the fuse, the operating power supply, and the operating current meet the performance index requirements. Figure 4 shows the trigger signal and ignition signal waveform of a certain type of electronic time fuse collected by the test system. 
3) Production control signal generation Most of the control signals for the electronic time fuze and the setter work are digital I/O signals. Therefore, the PCI-7230 isolated digital input/output card is used to generate the card. The card has 16 channels of isolated digital input and 16-channel isolated digital output function, its output channel has a wide signal output range of 5 ~ 35V, can meet the requirements for the use of various types of control signals for different types of electronic time fuze and setter, digital input channel has 0 ~ 24V input The range can be used to monitor changes in the various types of intermediate signals during fuze and fixture operation.
During the system test, the required digital power supply voltage is first determined according to the model of the product under test, and then the data transmission of the setter is completed through the serial port. Then the set start signal is sent from the digital output channel 1 to control the setter to start working. After completion of the determination, the start timing signal of the fuze is issued by the digital output channel 2 and the measured fuze starts timing. According to the test requirements of the fuze, various intermediate characteristic signals of the tested fuze are monitored in real time through the digital input channel. If the test has a time modification function In the electronic time fuze, after the fuse has started timing, it also sends a modified signal pulse to the fuse to be tested through the other three digital output channels. Figure 5 shows the output start control signal waveform. 
4) Test System Software Design Electronic Time Fuze The universal test system control software is developed based on LabVIEW 8.5 in the Windows operating system platform. It adopts the modular programming concept and is designed from the top down to meet the requirements of high-rate acquisition. Thread programming, the application is divided into three threads: a user interface thread, a data acquisition thread, and an instrument control thread. Has a good human-computer interaction interface for data acquisition, data analysis, storage and automatic report generation functions. The main flow of system testing software is shown in Figure 6. 
1) Product model selection Based on the model of the tested product, select the corresponding product model on the operation interface. The system control software automatically loads the corresponding system setup parameters according to the tested product model.
2) Power supply system control software according to the load of the tested product power supply parameters, the required power parameters are encoded and sent to the digital program control power supply through the serial port. The digital program power supply automatically adjusts the system power according to the received power parameters. And feedback the adjustment result to the system control software.
3) Selection of test items According to the test requirements of different fuses, different test contents such as setting performance test, continuous installation reliability test, and time-accurate function test are selected, and test conditions are selected for different test items, such as high temperature, Low temperature, vibration, etc., and automatically load corresponding test data according to different test contents and test items.
4) Function test function test After the first three items are selected, the test can be performed automatically by clicking Run. The system controls the work of the product under test through the control signal, and collects the relevant feature signals in the working process of the product under test. Each test project is packaged into a subVI to facilitate the call of the main VI and TestStand. The test data can be automatically loaded, or the settings can be modified before the test starts, such as setting time and modification time.
5) Data processing and storage After the test is completed, various test information and data shall be recorded, analyzed, processed, and stored, including the current test date, time, test data, and status of each test item (untested, passed, and fault information). Wait. The data processing and storage interface is shown in Figure 7. 
6) automatic report generation When you need to print or submit a test report, you can use the LabVIEW Report Generation Toolkit to call the corresponding report template file, or through TestStand, the stored data content in the template format to automatically generate the various reports and files required .
5. Test and Performance Verification The graphical real-time dynamic display of measurement data is an essential function of the test instrument. Common digital oscilloscopes, spectrum analyzers and other instruments all have CRT screens that can display the measurement signal waveforms and the instrument's working status. LabVIEW is a waveform display control that is a real-time trending control. The real-time trend graph control continuously adds new data to the existing data, and the waveform is continuously advanced and displayed so that the signal change process during the fuze work can be clearly observed and the measured signal can be monitored in real time. The change.
The real-time display of the test system data is the multi-channel signal of the fuze. In the "channel playback" column, the waveform of a certain channel can be displayed. When the data is played back, the displayed waveform can also be enlarged or reduced. Figure 8 shows the waveform of a channel displayed by the test system. 
The purpose of the fuze test is to obtain the operational performance, status or characteristic signal of the fuze, so the data acquisition is only the first step of the test work. Data analysis and processing constitute one of the important parts of the test system. The traditional fuze test data processing is accomplished through other tools such as DSP or MATLAB. The test system can fully use the rich and powerful analysis tool kit of LabVIEW software. Complex data analysis and processing work, its data processing all calls the toolkit in the background, its test result shows the pass or not after the operation judgement, causes the tester to understand the test result at a glance.
After the test system design was completed, we set some conditions to test the actual performance of the system. Through the tester's operation, the average single product test time is measured; the system reliability is verified through repeated tests; the system's detection rate level is tested by setting the fault; the signal is calibrated against the system. The test accuracy was tested. Tests have shown that the single test time of the test system has been reduced by more than half, and the test accuracy, reliability, and detection level have all been improved, and the requirements for system design have been met in terms of automation and versatility.
6. Conclusions In view of the working characteristics of electronic time fuzes and the requirements for automation and general use, this test system uses virtual instrument technology to install ADLINK's high-speed digitizers, digital I/Os, and relay outputs through industrial computers. The hardware design, combined with LabVIEW's graphical software programming, has developed a powerful electronically timed fuze universal test system with excellent performance and ease of expansion, enabling automated control of test procedures and steps, and analysis and processing of measurement data. The failure mode performs functions such as automatic judgment, which significantly improves the test efficiency, test accuracy, and detection rate. Compared with traditional testing methods, virtual instrument testing has great advantages and will be applied more extensively and deeply.