1. Introduction to the system
1. Main control board technical indicators
1) Number of channels: 8 channels, any 2 channels can be switched, and the resistance and voltage measurement share the analog bus.
2) DC characteristics:
A. Input impedance: 10MΩ
Input Protection: 600V.
B. Voltage range:
DC voltage: -400~+400V accuracy 1%
DC:
1uA~100uA Accuracy 5%
100uA~1A Accuracy 3%
3) AC Characteristics:
A. Input impedance: 1MΩ
Input Protection: 380V
B. RMS AC voltage: 0-220V, crest factor < 3, frequency 5hz - 1kHz, accuracy 3%
RMS value of AC current:
1uA~100uA Accuracy 5%
100uA~1A Accuracy 3%
4) Frequency acquisition
A. Frequency range:
2Hz~10KHz voltage 0 - 220V, accuracy 2‰
10k~4MHz voltage 0 - 30V, accuracy 2‰
5) Resistance acquisition (constant voltage measurement)
1Ω~1MΩ Accuracy 3%
1MΩ~10MΩ Accuracy 5%
2. Technical indicators of the channel switch board,
1) Number of channels: 24 channels, which can be used as channel expansion of the main control board, or as a separate acquisition channel.
2) Voltage acquisition
A. Voltage range: -300~+300V, accuracy 1%
3) Frequency acquisition
A. Frequency range: 2HZ~1kHZ accuracy 2‰
3. Technical indicators of program-controlled power supply board
1) Number of channels: 2 channels can output constant current or constant voltage
2) Voltage range: 1.5-28V step value 0.01V accuracy 1%
3) With over-current protection, constant current is 100mA~1.5A, and the precision 1mA current limit value can be set.
4. Technical indicators of positive and negative control input and output boards
1) Number of channels: 16 channels of output positive and negative terminal voltage (each 8 channels is a group)
16 input digital signals (compatible with 1.8~30v voltage).
2) Voltage and current: the maximum input current limit is 30V and the current limit is 10mA
The maximum output current limit is 30V (voltage 1.8~30v can be provided externally) The current limit is 350 mA
5. Technical indicators of switch output board
1) Number of Roads: 24 Roads
2 ) Overcurrent capability: 2A
3. Functions and Features
1. The circuit board function test system can test resistance, voltage, current, frequency, digital IO, etc.
2. It can provide program-controlled power supply within 30V, positive and negative control input and output, and switch output functions.
3. The main control board and each functional board use STM32 chips, which run fast and test stably.
4. Using Pad as the display screen, 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.
5. It can be used as embedded or wired, and can be used separately according to actual usage.
6. External serial instrument equipment can be connected, and the serial port can be used to control other instruments for collaborative testing, which is convenient for system expansion.
7. Separation of programming and testing interfaces. The programming interface provides the creation of test files, and the test interface is responsible for testing. Prevent the test program from being arbitrarily changed, and make the data safe and reliable. After downloading to EPROM, the test data can only be read to the host computer to change, and the data is more secure.
8. The table format programming interface (similar to the inspection process file format used on 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.
9. Universal design. When designing software and 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.
10. 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 engineers to debug the board under test.
11. 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.
12. When debugging, you can use the touch screen to operate the Pad, or you can connect the USB keyboard and mouse to operate the Pad through the USB HUB, which is convenient for debugging and data modification.
Five, 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. If the communication test is required, the communication test can be extended.