ICT and ICT test principles

I. Introduction:
The ICT online tester (IN CIRCUIT TESTER) detects all kinds of circuit board products by measuring all the components on the board, including resistors, capacitors, inductors, diodes, transistors, FETs, SCRs, LEDs and ICs. Disadvantages such as: short circuit, open circuit, missing parts, wrong parts, bad parts or poor assembly, and clearly point out the location of the defects, help users to ensure the quality of the product, and improve the efficiency of defective products. It is also the first to use REED RELAY, which has hundreds of millions of switches, is the most comprehensive online test machine with the highest coverage, the most stable test, the most convenient use, and the most complete data.

2. The principle of isolation (GUARDING) test:
The biggest feature of testing the ACT test is the use of GUARDING's technique, which isolates the component under test from its circuitry (as shown below). The computer program automatically selects the appropriate isolation point to select multiple.

Three. Resistance measurement method:
(1) Constant current measurement method:
Using constant current measurement, the computer program will automatically set the current source according to the resistance of the resistor to be tested.

(2) Constant voltage measurement method:
When the resistance to be tested is connected in parallel with a large capacitor, if the constant current measurement method is used, the charging time of the large capacitor is too long, but the constant voltage measurement method can shorten the test time.

(3) Phase measurement method:
When the resistor is connected in parallel with the capacitor, if the current measurement method cannot be used for accurate measurement, the phase measurement method is needed to measure the test. This method uses the AC voltage as the signal source to measure the voltage and current across the part. The phase difference is used to calculate the individual electrical impedance, capacitive reactance or inductive reactance.

(4) Measurement of small resistance:
Generally, the small resistance measurement (0.1 Ω~2 Ω) can be measured as JUMPER, but only the missing parts can be measured. For more accurate measurement, it is necessary to measure with four ends. The principle is as follows:

The source and measurement each have their own loop, so the voltage drop across the RX can be accurately measured.

Application: Small resistance such as 0.1Ω~10Ω, small inductance, small capacitance measurement will be affected by poor cable and probe contact, resulting in unstable test, and four-wire measurement can solve these problems.
The modification from the two-line to the four-wire measurement method is as follows:
a. The relay board needs to be modified as follows, and the JA, JB, and JC jumpers are removed to make OPEN open.
b. JA0, JA1, JA2, JA3, JB0, JB1, JB2, JB3, JG0, JG1, JG2, JG3

c. At this point, the Relay board has only 32 points left, because the second connector has been used as a sense.
d. The program must be set as follows:

e. At this setting, the resistance value can be measured to a minimum of 0.01 Ω.

Wax Device

E-cig as a substitute of tobacco mainly reminds people of its potential benefits for health. Four ingredients contain in the e-liquid : propylene glycol, glycerin vegetable, nicotine and food grade essence. Nevertheless, smoke from cigarette contains carbon monoxide, tar, arsenic, ammonia, and many other cyanide and acetone.


Advantage


  • New ceramic self heating element, Uniform heating
  • High reduction, Temperaturecan be accurately controlled
  • Safety and Health, Worth a product,Natural and realistic taste,Factory Direct Sale
  • Using proprietary technology,Quality assurance, trustworthy
  • Oil leakage free, compact, pocket-sized, portable and easy to transport
  • So that smokers can smoke addiction, refreshing, to meet the psychological and physiological needs of smokers, and in line with the habit of smokers for many years.
  • Compared with rechargeable e-cigarettes and mechanical e-cigarettes, the price of disposable e-cigarettes is much lower, which is applicable to a wider range of customers than the first two. It is also the absolute truth for ordinary consumer groups to be cheap.


Wax Device Oem,Thc Wax Device Oem,Marijuana Wax Device Oem,High Cost Performance Wax Device

Shenzhen MASON VAP Technology Co., Ltd. , https://www.cbdvapefactory.com