Full-featured general functional test system EF02

    1. Product background

    FCT is the functional test of the circuit board, which is an indispensable process in the production process of electronic products. Traditional functional tests generally use manual methods to manually connect various desktop instruments such as power supplies, signal generators, oscilloscopes, and multimeters to the circuit board to be tested; The test board carries out the item-by-item detection of various electrical parameters, manually judges the test results, and manually records the test results parameters; this manual test method not only has a slow test speed and low test efficiency, but also due to misoperation, misjudgment and other artificial factors, the test reliability and consistency are low, and therefore, the quality of the final product is difficult to guarantee.

    With the rapid development of computer electronic testing technology, automated functional testing equipment has developed rapidly; the automated functional testing equipment is based on a computer (industrial computer or PC) as the core, through GPIB, PCI, VXI, PXI, USB and other buses , interconnect each desktop instrument or instrument module, and automatically control each instrument module through computer software, and automatically according to the test process and test parameters preset by the software, the circuit board (or the whole machine) to be tested is automatically controlled. Carry out various functional tests, automatically judge the test results, automatically record all test results to the hard disk, and can check, analyze and count the test results at any time, which is convenient for the management and control of the production process.

    The adoption of automated functional test equipment can not only improve the test efficiency, but also improve the consistency and reliability of the test results, so as to ensure the quality of the electronic products produced, and at the same time greatly reduce the technical requirements for the testers, which is a good tool for enterprise units. Reduce labor costs; in addition, the application of automated functional testing equipment can also improve the corporate image, which is conducive to gaining the trust of customers in the fierce competition; therefore, automated functional testing equipment, by more and more electronic products Favored by enterprises and institutions.

    With the continuous increase in daily output of electronic product manufacturers (especially in the small household appliance industry, such as air conditioners, refrigerators, mobile phones, etc.), the demand for FCT equipment is also increasing. However, large-scale automated functional test equipment generally needs to be connected to various peripherals, such as multimeters, oscilloscopes, etc., resulting in automated test equipment generally larger in size and higher in price. In addition, because of the need to connect various peripherals, the measurement is generally performed by the peripherals Measurement, etc., the test speed is also relatively slow, which is not suitable for some small and medium-sized enterprises that are price-sensitive and have high speed requirements, and are not suitable for some occasions that require miniaturized equipment.

    In summary, a miniaturized, relatively cheap, full-featured general-purpose functional test system that can use touch screen, Pad, notebook, etc. to control and display, and can easily add peripheral instruments such as oscilloscope, multimeter, program-controlled power supply, etc. .

    2. Technical indicators

     1. Component measurement board technical indicators

     1) Voltage measurement: 16-bit high-precision voltage bus measurement

        A: Measurement mode: bus measurement, use the measurement/channel switch board to switch acquisition channels.

        B: Voltage acquisition (isolated acquisition)

          Voltage range: -400~+400V ±0.1% The range of the acquisition voltage is determined by the measurement/channel switching board.

     2) Resistance measurement

           Measuring range: 5Ω~5MΩ ±1%

        3) Capacitance measurement

           Measuring range: 1nF-1000uF ±5%

        4) Diode measurement

          Measuring range: measure the forward and reverse of the PN junction.

       5) Inductance measurement

          Measuring range: 10uH – 100mH ±1%

       6) Current measurement (common ground measurement)

          A. Number of channels: 4

          B. Withstand voltage: 220V

          C. Current range: DC ±2A ±1%; AC maximum ±2A ±1%;

     2. Technical indicators of measurement/channel switching board

       1) Number of channels: 32 channels/block, which can be used as a channel extension of the component measurement board, or as a channel for separate acquisition. Each system can be configured with up to 16 switch boards.

       2) Voltage acquisition (isolated acquisition)

          Voltage range: Standard: -200~+200V  

          -0.5~+0.5V accuracy 3%, -200~-0.5V 0.5~200V accuracy 1%

         Optional: -400~+400V  

         -0.5~+0.5V accuracy 3%, -400~-0.5V 0.5~400V accuracy 1%

       3) Frequency acquisition

          Frequency range: 2HZ~100kHZ accuracy 2%

      4) Waveform analysis

         A. Frequency range: 1HZ-1KHZ ±2%

         B. Voltage amplitude: -200~+200V ±1%

          The main functions of waveform analysis are: maximum value, minimum value, peak-to-peak value, duty cycle, and phase difference.

    3. Technical indicators of program-controlled power supply board

     1) Number of channels: 2 channels can output constant current (current limiting mode) or constant voltage in common

       2) Voltage range: 1.5~28V step value 0.01V accuracy 1%

Standard configuration: internal power supply, when the internal power supply is powered, the maximum output voltage is the power supply voltage of the program-controlled power board minus 1V. Optional external power supply, if the external power supply is greater than 28V, the output voltage of the external power supply is 1.5V~28V.

        3) Current range: constant current 100mA~1.5A, accuracy 1% + 1mA, current limit value can be set.

     4. IO input and output board technical indicators

      1) Number of channels: 16 channels of output (each 8 channels is a group, there are two groups in total, which do not share the ground with the system, and the two groups in the board share the ground output)

16-channel input digital signal (high level compatible with 1.8~30v voltage, low level below 0.5V).

        2) Voltage and current: input maximum voltage 30V

The maximum output voltage is 30V (depending on the power supply voltage, and the internal power supply is 5V optional), and the current limit is 50 mA.

    5. Technical indicators of switch output board

    1) Number of channels: 24 channels (normally open and normally closed)

    2) Rated current: 2A

   3) Withstand voltage: 200V

    6. Technical indicators of high current load board:

    1) Number of Roads: 16 Roads

    2) Rated current: 5A

    7. Infrared and four-phase eight-clapper technical indicators:

     1) Infrared is used to simulate the remote control, can learn 50 remote control commands, can send and receive. You can also send or receive remote control commands independently through the host computer software.

    2) Four phases and eight beats are used to detect stepper motors:

      A. Detection amplitude: Accuracy ±1% Range: 0~60V Resolution 5mV 

      B. Detection frequency: Accuracy ±2% Range: 1hz-200Hz (over 200Hz, the accuracy will be reduced)

      C. Detection phase difference: Accuracy 2° Range: 1Hz-200Hz (exceeding the accuracy will reduce)

      D. Detection of DC voltage: Accuracy ±2% Range: 0~±60V

   3) IIC communication

     Read and write IIC data, the maximum number of bytes sent and received in a single time is 128 bytes. One channel per board.

    8. Technical indicators of signal source board:

    1) Number of channels: 2, non-common ground output, the negative terminals of the two outputs are at the same potential.

    2) Type of output signal: DC voltage, PWM square wave, triangle wave, sine wave

    3) Output voltage: -15V ~ 15V, accuracy 2%

     4) Output frequency range: 0.1~10kHz, accuracy 1%

     5) Duty cycle: 1%~99% resolution 1%    

    9. Technical indicators of active load board

     1) Programmable voltage output: DC2V~6V accuracy 0.5%, current limiting 0~300uA, 300uA~30mA, 30mA~3A accuracy 5%;

       2) Program-controlled load output: constant voltage 1V~8V accuracy 1%

                Constant current 0~300uA, 300uA~30mA, 30mA~3A, accuracy 0.5%

               Constant resistance 100 ohms ~ 2080 ohms, resolution 1.93 ohms, accuracy 2%;

                    2080 ohms~10720 ohms, resolution 9.96 ohms, accuracy 2%;

                   10720 ohms~208030 ohms, resolution 193.3 ohms, accuracy 2%;

                   208030 ohms~1072020 ohms, resolution 996 ohms, accuracy 2%;

                   1072020 ohms ~ 20803067 ohms, resolution 19329 ohms, accuracy 2%;

                   20803067 ohms~17202000 ohms, resolution 99609 ohms, accuracy 2%;

    3. Product Highlights

     1. Each functional board adopts STM32 chip, which has fast running speed and stable test.

     2. Using Pad/notebook as the display screen, running the host computer software, the display screen is large and the operation is simple. Using the Windows system is more in line with the control habits of most people, and can realize all operations under Windows, with powerful functions. The upper computer software runs under the Windows system, and the modification and addition of functions are very convenient.

     3. It shares software with large-scale FCT test system. The software has powerful functions. It can not only edit test files conveniently, but also have functions such as statistics and export of test result files. Software unification also facilitates software maintenance.

     4. It can share software with large-scale FCT system, and can also externally connect standard instrument equipment such as serial port and USB, and work together with EF02 hardware. The expansion of the equipment is very convenient.

     5. The table format programming interface (similar to the inspection process file format used in the operation site) is used to facilitate the creation of test steps, and the order of test steps can be adjusted at will, and the test sequence and logical relationship can be combined arbitrarily.

     6. Universal design. When designing hardware, full consideration is given to versatility. As long as it is within the functional indicators of the hardware configured in the tester, customers can easily replace different products to be tested. They only need to replace the corresponding test fixtures and configure different test files to test.

     7. It has the ability of automatic full test and manual selection of single-step test, and has the ability of single-step cycle test, which is convenient for customer engineers to debug the board under test.

     8. When the specified defect of the circuit board under test (for example, a power supply short circuit) occurs, the system will automatically stop the test in order to protect the board under test and the test system and prevent the failure from expanding.

     9. One set of software can control multiple sets of hardware systems at the same time, and can be tested in parallel, which greatly improves the test efficiency.

     10. Adopt database management to facilitate data access and statistics. All test data and test results are stored in the database, and comes with test result statistics software. Accessing the database through the statistical software can facilitate the statistics of test results.

    11. General MES interface function to facilitate data import into MES system. Using the unified MES interface function, the customer only needs to simply set the storage process of receiving data on the MES side, and then the test results can be transmitted to the customer's MES system, which is convenient for the unified management of data.

    Four, customer-oriented

      1. It can be oriented to tooling and fixture manufacturers and processors. When tooling and fixture manufacturers receive orders, some customers have simple functional testing needs and can sell them boards.

      2. Smaller and larger output circuit board manufacturers. Small circuit boards generally have relatively simple functions to be tested, and there are more functional test equipment required for larger output, and higher requirements for price. This type of customer can sell multiple devices at a low price.

      3. High-voltage and high-power power supply is not required, and there is no other type of communication except serial communication. Test voltage, current, resistance, and frequency. Most boards of this type can be tested.

      4. For functional tests that do not use external instruments such as multimeters and oscilloscopes, the EF02 structure can be considered for testing.