Short Circuit
Protection Test
Short Circuit Protection Test as per IEC 61000-4-5
Before a surge test result means anything, the equipment doing the testing has to be trusted first. That's the entire point of a short circuit protection test — it checks the surge generator itself, confirming it produces the exact energy profile and source impedance that IEC 61000-4-5 requires.
This isn't a test of a client's product. It's a calibration step, run on the lab's own equipment, to make sure every surge test that follows produces results someone can actually rely on.
What gets measured is the short circuit current output of the generator, compared directly against the standard's 8/20 microsecond profile. If that profile is off, even slightly, every surge test result downstream becomes questionable.
This step exists because manufacturers need confidence their protection claims rest on accurate numbers, not on a generator that's drifted out of spec. Short circuit protection testing closes that gap before it becomes a dispute later.
At Aldo Compliance, this looks like:
Surge Generator Calibration
Running regular surge generator calibration checks against IEC 61000-4-5 output specifications
Source Impedance
Measuring source impedance to confirm it sits within the standard's defined range
Calibration Records
Keeping documented calibration records that clients can request at any point
First Step of Every Project
Treating this as the first step of every surge test project, not an optional extra
Frequently Asked Questions
Why check this before doing a surge test?
It confirms the test setup itself meets IEC 61000-4-5, so the actual product results can be trusted.
How often does a surge generator need recalibration?
Most labs recalibrate on a set annual schedule, or sooner if the equipment gets serviced.