The hardware system of tantalum capacitor automatic test system is composed

Tantalum capacitor automatic test system is an automatic test system based on GPIB bus, including GPIB bus and programmable instrument with GPIB interface. It is by the plug PCIGPIB bus control interface board PC) (hereinafter referred to as the GPIB controller, programmable leakage current tester, programmable multi-channel switch, the LCR meter, measured box and printer, GPIB bus connection respectively GPIB controller, programmable leakage current tester, programmable multi-channel switch, LCR tester, leakage current measuring instrument, programmable multichannel connection programmable switches, the LCR meter, multi-channel connection programmable switch, measured multiway switch boxes and programmable connection, GPIB controller and connect the printer.

Due to the rapid development of PC in recent years, the motherboard is no longer equipped with ISA slot, so the system GPIB controller is characterized by the use of pci-based GPIB bus control interface board, with listening, speaking, control and other functions, in line with the IEEE488.2 standard and SCPI protocol, support windows9x operating system. As for the PC configuration, in addition to the motherboard needs to have a spare PCI slot, can meet the requirements of running windows98 operating system hardware configuration.

Programmable leakage current tester is used to test the leakage current of electrolytic capacitors such as aluminum and tantalum.

The characteristics of the programmable leakage current tester of the system are as follows:

(1) with GPIB interface and listening/speaking function, GPIB interface conforms to IEEE488.2 standard and SCPI protocol, and can receive PC commands or send measurement values to PC;

(2) the charging, measuring and discharging states of the leakage current meter can be switched programmatically;

(3) charging and discharging time can be programmatically controlled. There are 12 levels of 0.5, 1, 2, 3, 4, 5, 6, 7, 10, 30, 60-999s and manual control.

(4) digital quantity display and output. Polarization voltage and leakage current were displayed in four-digit tubes respectively. The polarization voltage was displayed in the first gear of 0-200.0v, and the leakage current was displayed in the four ranges of 99.99uA, 999.9uA, 9.999mA, and 99.99mA.

Output polarization voltage accuracy:

0-50v 2% full range 50v-200v 2% full range

Accuracy of digital voltmeter:

0-200v 1% full range

Accuracy of each range of digital ammeter:

1% full range plus or minus 10 words.

Programmable multiplexers NJ29 programmable multiplexers, NJ29 is equipped with five different relay card, basically meet the needs of different users on switching voltage, switching current, switching speed, switching channel number, suitable for the construction of GPIB bus as a variety of automatic test system. This system adopts two high-sensitivity CARDS, with a total of 80 channels. The relay contact is single-pole double-throw type, the contact potential is less than 5uV, and the contact life is 1*106.

LCR measuring instrument adopts "ZL5 intelligent LCR measuring instrument". The main feature of ZL5 is that the basic measurement accuracy is 0.05% and the test speed is up to 12 times /S. In order to meet the various components of different test conditions, test voltage frequency 12 hz - 100 KHZ and 5-1.275 - V can be programmed to choose, mv four-terminal measurement technology principle (kelvin) used to ensure that the measurement connections longer ZL5 also has high measurement accuracy, ZL5 with GPIB interface and the separation of interface but also meet the form of automatic test system and the demand of the production of automatic sorting, and can be in the form of a series of equivalent or parallel equivalent circuit also showed a measured amount of master the LCR and vice QDR values. The LCR measuring instrument provides four display modes to meet various test requirements: the actual value of the tested part, the percentage deviation of LCR, the absolute deviation of LCR and the hopper number. In this system, in order to prevent ZL5 from being damaged by residual high voltage (dc voltage greater than 60V) after charging and discharging of electrolytic capacitor, a gas discharge tube is added at the measuring end to effectively protect ZL5.

The system selects the printer to print on A3 or A4 size. It is a universal needle printer or inkjet printer for commercial products. The printer interface can be Centronix interface or USB interface. HPLL20C inkjet printer was selected when the system was constructed. After the GPIB controller collects and processes all kinds of data, it can print out the output according to the predetermined format.