IPC TM-650 2.5.33.2

Abstract

This test method deals only with transients generated within the Unit Under Test (UUT) and not with transients originating elsewhere (i.e., power line transients), which propagate through the UUT. This procedure measures transient voltage events appearing at the hot tip of an electric hand soldering/desoldering tool, which could be seen by the workpiece. The test electrode and measuring equipment represent a workpiece having a high impedance. There are two times when transients testing should be done: Equipment qualification for purchase Incoming inspection of new or repaired equipment A storage oscilloscope is used to observe and measure transient events. The test electrode is coupled to the vertical input of the oscilloscope via a 10 MW probe. The UUT may be isolated from ambient electronic noise by placing it in a screen room or shielded enclosure and supplying filtered AC power. Inside the shield, the hot tip of the UUT is touched to the test electrode. This test may be falsely influenced by radio frequency interference and electromagnetic interference from lighting and equipment found in the workplace and testing area. This will normally be demonstrated by ambient transients of 1.5 V peak being present. At a minimum, shielded test leads should be utilized. To avoid these influences it may be necessary to perform the leakage and transient tests in a screen room. In lieu of a screen room a separate test procedure, see Method 2.5.33.4, which makes a low cost shielded enclosure, which should provide adequate shielding for the performance of these test procedures. <br>Warning: This is a laboratory test procedure that may of necessity expose terminals that carry line voltages. All standard laboratory safety procedures regarding the setup and performance of tests with line voltage equipment must be observed at all times. <br>Caution: This test is performed with soldering systems at their normal operating temperature. Test personnel must take adequate precautionary steps to protect themselves and others from potential burns.