PCB Test
PCB Electrical Testing
Yingstar conducts 100 percent electrical testing on all bare PCBs manufactured at its facilities in accordance with IPC-9252 standards. In our circuit board manufacturing process, we utilize either the Bed of Nails Fixture method or the Flying Probe method for testing.
TESTING CAPABILITES AND TYPES
Our testing capabilities are listed in the following table:
|
Testing Capabilities |
|
|
Minimum Continuity Resistance |
0.1 Ohms |
|
Maximum Test Voltage |
1000 Volts |
|
Maximum Isolated Resistance |
25 M Ohm – 2 G Ohm |
|
Electrical Test Pitch (Fixture) |
0.020″ |
|
Electrical Test Pitch (Flying Probe) |
0.004″ |
Our testing process will vary depending on both the design and the cost:
1,The Bed of Nails Fixture method, or
2, The Flying Probe method
Customers are sometimes unsure of the distinction between Fixture (Bed of Nails) testing and Flying probe testing, as well as the costs associated with each. The following illustration clarifies the distinction between the two ways and the circumstances in which one or the other may result in a more effective PCB Assembly Process.
Let’s assume there are 3,500 test points and 750 nets for this example.
TEST FIXTURE (BED OF NAILS)
Electrical Test Pitch = 0.020″
Setup time: 30 minutes
Learn time: 0 minutes
10 minutes to debug / check for missing pins
Test time per board: 40 seconds
All points are tested simultaneously.
Nonetheless, this procedure necessitates both setup time to produce the fixture and additional material expenditures.
FLYING PROBE
Electrical Test Pitch = 0.004″
Setup time: 0 minutes
Learn time: 20 minutes
Test time per board: 6 minutes
The points are tested one at a time.
Since the machine learns the program as it runs, there is no setup time.
If Fine Pitch is not a concern (depending on the design), our PCB manufacturing threshold is 15 panels. Therefore, we would choose a testing technique based on the following criteria:
Flying Probe: less than 15 Manufacturing Panels
Test Fixture: greater than 15 Manufacturing Panels
TESTING REPORTS
We provide the following reports free of charge upon request:
1.Micro Sections
2.X-Section Reports
3.Cross Section Reports
4.Solderbility Report
5.TDR Test Report (For Impedance Controlled PCBs)
6.Hipot Test (For all cores < 0.003″)
7.Peel Strength Report
8.C of C
9.RoHS Compliance Report
10.U.L Certificate
