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.