Equipment for industrial capacitor testing
Since its founding in 1956, Kohan Electronics (Japan) has been the leading specialized manufacturer of industrial testing equipment for capacitor products. The company Kohan develops and sells a line of automated test systems for the entire range of capacitor products manufactured by leading global manufacturers.
The main types of capacitors tested:
- Aluminum Electrolytic
- Tantalum Electrolytic
- Tantalum chip capacitors
- Ceramic multilayer
- Film Multilayer
Features of the company’s products:
The company’s products are always individually designed automated lines with varying degrees of automation:
- from the formation of leads,
- visual quality control,
- testing electrical parameters,
- up to packing batches of capacitor products.
The degree of automation is determined at the design stage based on the required performance and economic feasibility.
Model VCB-D001. Phase difference Type Capacitance Bridge
1.Fundamental Measurement Principle
The phase difference is digitally measured with a bridge composition which is set as 1 to 1 ratio between a standard resistor (Rs) and a measured capacitor (Zx).
A nominal capacitance and a dissipation factor values are measured simultaneously and repeatedly with 120 Hz and 1 kHz frequencies. The measuring speed for 120 Hz is 16 msec. and for 1kHz is 10 msec., high-speed measurements are actualized.
With the basis of an accuracy of an oscillator and a temperature coefficient of a standard resistor, stable measurement values are maintained for long time with onetime calibration. Also, a contact resistance is separated on the vector, and a stray capacitance is corrected which makes a high-accuracy measurement possible.
The measured values are derived by averaging those measurements of maximum repetitions, for 120 Hz is 9 times (9 cycles) and for 1 kHz is 41 times (41 cycles).
In order to avoid the influence of the residual voltage of a measured capacitor, rapid discharge function, which is used before the measurements, is installed.
Because of using a phase difference measuring method, those high-speed measurements are not influenced up to 5 V of a residual direct current voltage.
7.Direct current Voltage Overlay
A rapid charging function of a direct current overlay voltage(0-5 V DC).
Internal Fix: 0 V or 1.5 V DC
External power supply connecting: 0-5 V DC
The measuring voltage, which is applied to a large capacitance and a high dielectric constant capacitor, instantaneous auto-adjusting function is installed
Examples of installations manufactured and delivered
Model FMT-1001. Tantalum Capacitor Total Automatic Inspection System
The complex of equipment includes:
FMS-1001, Chip Capacitor Lead Frame Forming Machine.
The capacitor leads are made of ferro-nickel tape and are molded in a special way to enable automated surface mounting of the capacitors on the printed circuit board. Tantalum chip capacitors come to the pin forming section with direct leads of oversized dimensions (A). On the FMS-1001 unit, the pins are trimmed to the size specified by the technical conditions, and then the pins are folded to give the product a specified look (B).
–KMS-1001, Tantalum Capacitor Total Automatic Inspection System
– MVS-1001, Visual Testing Machine
Model TC-6202 Tantalum Capacitor Molding Chip Inspection Equipment
Model TC-7101. Molding Chip A-Type Final Product Inspection Equipment
Model DT-7002 Dip type Tantalum Capacitor full Automatic Inspection Equipment
Model FCF-1001 Hoop type Film chip capacitor Automatic Inspection Equipment
Model MX-1001 Matrix-type Product Handling Inspection Equipment
Model TTS-2000. Re-Inspection Standard Sorting and Taping System
Model FC-4001. Multilayer Film Chip Capacitor Final Product Inspection Machine
Model MM-5001. High-Voltage MF Capacitor Line Connecting Inspection Equipment
Model VT-1001 Varistor Three Side Electrodes Inspection Equipment
Model DF-804S CPU Equipped MF Capacitor Automatic Inspection Equipment
Model DE-405. Aluminum Electrolytic Capacitor Automatic Inspection Equipment