IPC-9252A Requirements for Electrical Testing of Unpopulated Printed Boards.pdf - 第3页

October 2012 IPC-9252A – Amendment 1 1 T able 4-1 Requirements by T est Level Replace the table and footnotes as follows: TEST LEVEL A B C Performance Class 1 2 3 5 Source Data CAM, CAD CAM, CAD CAD 1 TEST METHODS Resist…

Association Connecting Electronics Industries

IPC-9252A

Amendment 1

Requirements for Electrical

Testing of Unpopulated

Printed Boards

October 2012

A standard developed by IPC

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October 2012 IPC-9252A – Amendment 1

Table 4-1 Requirements by Test Level

Replace the table and footnotes as follows:

TEST LEVEL A B C

Performance Class 1 2 3

Source Data CAM, CAD CAM, CAD CAD

TEST METHODS

Resistive Continuity Testing ≤ 100Ω ≤ 50Ω ≤ 10Ω

Resistive Isolation Testing ≥ 500kΩ ≥ 2MΩ ≥ 10MΩ

Indirect Isolation & Continuity Testing by Signature Comparison Yes Yes AABUS

Adjacency (for isolation testing)

2,3

Yes Yes AABUS

Required Testing of Accessible Midpoints

No No Yes

Note 1. See 5.1.2

Note 2. Default minimum of 1.27 mm [0.050 in] or AABUS.

Note 3. Includes horizontal and/or line of sight adjacency; vertical adjacency is not required unless speciﬁed.

Note 4. For referee purposes, 0.5Ω maximum for each 25.0 mm [0.984 in] of circuit length shall apply.

Note 5. For Class 3/A Performance Requirements, see IPC-6012.

Note 6. Conductors not covered with solder mask or via plug material.

4.2.1 Resistive Isolation Testing

Replace third and fourth sentences as follows:

For automated test equipment, the test voltage shall be as speciﬁed on the master drawing. If the rated voltage is listed, rather than

a test voltage, the minimum test voltage shall be this rated voltage or 40 volts minimum, whichever is greater. If no test or rated

voltage is listed, the test voltage shall be 40 volts minimum. The test voltage shall be applied between nets under test.

Requirements for Electrical Testing of

Unpopulated Printed Boards