|Place Of Origin::||Guangdong China||Material::||FR4 TG>180|
|No Of Layers::||Double Layer||Solder Mask Colour::||Green|
|Surface Technics::||ENIG||Copper Thickness:||5/5 OZ|
5 OZ Heavy Copper Printed Circuit Board Used In Power Supply
1 2 Layer FR4 substrate printed circuit board with 2.5mm.
2 Heavy copper on each layer, copper thickness is 4 OZ 150UM.
3 The surface treament on exposed copper pad is immersion gold.
4 Silscreen color is white.
5 Solder mask color is green.
6 Gerber file or pcb file is essential for pcb production.
7 UPS area used.
8 FR4 Material: S100-2 High TG Degree
S1000-2 Material data sheet:
|Td||IPC-TM-650 22.214.171.124||5% wt. loss||℃||345|
|CTE (Z-axis)||IPC-TM-650 2.4.24||Before Tg||ppm/℃||45|
|Thermal Stress||IPC-TM-650 126.96.36.199||288℃, solder dip||--||100S No Delamination|
|Volume Resistivity||IPC-TM-650 188.8.131.52||After moisture resistance||MΩ.cm||2.2 x 108|
|E-24/125||MΩ.cm||4.5 x 106|
|Surface Resistivity||IPC-TM-650 184.108.40.206||After moisture resistance||MΩ||7.9 x 107|
|E-24/125||MΩ||1.7 x 106|
|Arc Resistance||IPC-TM-650 2.5.1||D-48/50+D-4/23||s||100|
|Dielectric Breakdown||IPC-TM-650 2.5.6||D-48/50+D-4/23||kV||63|
|Dissipation Constant (Dk)||IPC-TM-650 220.127.116.11||1MHz||--||4.8|
|Dissipation Factor (Df)||IPC-TM-650 18.104.22.168||1MHz||--||0.013|
|Peel Strength (1Oz HTE copper foil)||IPC-TM-650 2.4.8||A||N/mm||—|
|After thermal Stress 288℃,10s||N/mm||1.38|
|Flexural Strength||LW||IPC-TM-650 2.4.4||A||MPa||562|
|Water Absorption||IPC-TM-650 22.214.171.124||E-1/105+D-24/23||%||0.1|
Q1:What are PCB Test points?
A test point in a PCB is an exposed copper pad that can be used to check whether a circuit is functioning to specification. During production, users can inject test signals via probes through the test points to detect potential issues. The test signals output determines if a given signal is low/high when compared with the desired result and optimal changes can be made to achieve the same.
The PCB Test point must be located on the exterior layer of the board. This allows the test equipment probes to make contact with it and conduct the test. The test probe tips are available in a variety of shapes for different testing surfaces (flat, spherical, conical, etc) which allows for each test point on the board to be matched with the probe that is best suited to it. This allows the designers to designate the existing thru-hole pins and vias on the boards as a test point.
Types Of Test Points:
Probe Test Point
The First type of test point is an easily accessible point that can be accessed by a technician using a handheld device or a probe. These test points can be easily identified such as “GND”, “PWR” etc. The probe test is done to perform surface level testing i.e. verify proper current supply and ground values.
Automated Test Points:
The Second type of test point is used for automated test equipment. The automated test points on the PCB are vias, thru-hole pins, and small landing pads of metal that are designed to accommodate the probes of automated test systems. Automated test points allow for Automated testing procedures that make use of Automated test probes. They are of three types:
1. Bare board testing: The bare board testing is done prior to assembly of the components to ensure that there is good electrical connectivity throughout the board.
2. In-circuit testing (ICT): The ICT test is performed to ensure all the components present on the board are working as they should. Probes from the testing fixture will come in contact with the test points on the circuit boards to perform the test.
3. Flying Probe Testing (FPT): Flying Probe Testing (FPT) is an automated test used to evaluate the proper operation of components on a PCB board. In this test, two or more probes are programmed to move across the board in the air and access various component pins one by one to detect faults like Opens, Shorts, Resistance values, Capacitance values, and Component Orientation.
Things to Consider while implementing a test point on a PCB:
Advantages of adding test points to the PCB:
Test Points are essential in verifying the integrity of a PCB. The number of test points on a PCB board must be limited as they are an exposed copper area that could accidentally short to another test point in its close proximity and damage the circuit.