Over Voltage/Under Voltage Protection Testing as per IEC 61000-4-11
Over Voltage/Under Voltage Protection Testing as per IEC 61000-4-11
Power is never perfectly steady. Anyone who's worked with electrical grids knows this — dips, brief cutoffs, and sudden swings happen more than most people realize, especially on industrial lines. The question isn't whether these disturbances will happen. It's whether the equipment survives them without shutting down or getting damaged.
IEC 61000-4-11 is built around that exact question. It applies to low-voltage AC-powered equipment and checks how the device behaves when its power input suddenly drops, dips, or briefly disappears altogether.
During the test, controlled dips and interruptions get applied straight to the power line. Engineers watch for three outcomes: the device keeps running like nothing happened, it recovers on its own after a moment, or it fails outright. Only the first two count as passing.
Why does this matter outside a lab? Because industrial power grids fluctuate constantly, and equipment that resets every time voltage dips creates downtime nobody budgeted for. Voltage dip testing confirms reliability before that becomes someone else's problem in the field.
What the test setup at Aldo Compliance looks like:
Connecting the equipment to a calibrated voltage dip simulator built to IEC 61000-4-11 parameters
Running multiple dip levels and durations to check consistency across conditions, not just one scenario
Tracking device behavior throughout — resets, glitches, or clean recovery, all logged
Issuing a compliance report confirming which immunity class the equipment actually meets
FAQs
Which products need this test?
Anything running on AC power, especially in industrial or defense settings, benefits from this check.
What counts as a voltage dip?
A temporary drop in supply voltage, usually lasting anywhere from a few milliseconds to a couple of seconds.
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.