Radiated Immunity: Keeping Your Charging Case Alive in an RF World

The direct answer

Radiated immunity testing exposes your product to a radio-frequency field - 3 V/m from 80 MHz to 1 GHz, amplitude-modulated the way real signals are - and requires it to keep working throughout (Criterion A). The world is full of RF sources: phones, Wi-Fi routers, security gates, cabin systems. If a suitcase's charging circuit resets or its port stops working when a phone transmits nearby, the immunity test is where it gets caught. Our Model 1338 was tested on all six faces, both polarizations, and passed every exposure at Criterion A.

Why a charging circuit is a victim as well as a transmitter

The same electronics that can radiate noise can also be disturbed by noise from outside. A strong RF field induces currents in the case's internal wiring, and those currents can be interpreted as signals - resetting a controller, glitching a regulator, or making the USB port behave erratically. Immunity testing is the product proving it can live in the RF environment it will actually meet.

The test conditions in our report

How the test runs

1. The product operates in its normal mode - for the 1338, charging function active.
2. The product sits in the chamber on a non-conductive table, at the height and position the standard defines.
3. A generating antenna illuminates one face with the modulated RF field, first vertical then horizontal polarization.
4. The frequency sweeps 80 MHz to 1 GHz in small steps, dwelling long enough for the product to respond.
5. Every face gets the same treatment - because a product can be vulnerable on one side and fine on another.
6. The charging function is monitored the whole time; the report records the criterion achieved per face.

Factory data: Our report shows all six faces and both polarizations with a Pass on every line - twelve exposures in total. That completeness is the point: a report that tests one face is testing a lucky orientation, not a product. When we brief the lab, we insist the charging port and cable are part of the configuration, because the port is where the induced currents actually enter.

Criterion A, again

Under EN IEC 55014-2, radiated immunity requires Criterion A: the apparatus continues to operate as intended during the test, with no degradation below the specified performance level. For a charging case, "operating as intended" means the charging function keeps working while the field is applied. That is what our report documents - not "recovered after the test," but "kept working through it."

Industry need: why this test matters for real travel

Think about where a smart case actually lives: airport terminals with security scanners, train stations with ticket gates, aircraft cabins where a passenger charges a phone next to your case. These are exactly the environments where RF fields are present. Immunity testing is the evidence that the product's electronics will not flinch in the places it is designed to be used - and for EU market access, it is a CE requirement under the EMC Directive.

FAQ

What is radiated immunity?

A test that exposes a product to a radio-frequency field and verifies it continues to operate as intended - proving it is not disrupted by the RF environment around it.

What does 3 V/m mean?

The electric field strength the product is exposed to - 3 volts per meter is a realistic indoor level, representing nearby transmitters like phones and Wi-Fi equipment. Higher field strengths are used for harsher environments.

Which faces of a suitcase get tested?

All six - front, rear, left, right, top and bottom - in both vertical and horizontal polarization. A vulnerability on one face is still a vulnerability.

What happens if a product fails radiated immunity?

The electronics get engineering fixes - better filtering, shielding, layout changes - followed by a retest. The failures are usually quiet: a port that stops, a controller that resets.

Is immunity required in the US too?

US market access centers on FCC Part 15 (emissions); immunity is not part of the classic FCC Part 15 equipment authorization, though buyers and markets may still require it. EU CE is where immunity is mandatory.

What function does the lab monitor during the test?

The report should say. Ours monitors the charging output of the 1338 - the function that matters for the product. If the report does not state what was monitored, the "pass" is hard to interpret.

About this report

The radiated immunity data in this article comes from report No. GTS2025080251E01 for our Model 1338 - 3 V/m, 80 MHz-1 GHz, all six faces, both polarizations, Criterion A on every exposure. We share the immunity pages with buyers. If you are evaluating a factory's EMC evidence, ask to see the monitoring method and the per-face results - and if you want help reading one, send it to clkbusiness@clkluggage.com or WhatsApp +86-18879628221.