How long does FCC certification testing actually take for a dual-band consumer device?
We've got a new wireless speaker going through FCC Part 15 certification and our contract lab quoted 6-8 weeks for the full test cycle. That seems long for what I'd consider a fairly standard Class B device, but it does have both Bluetooth and 2.4 GHz Wi-Fi running simultaneously. Is that timeline typical or are we getting sandbagged?
Pre-compliance testing in-house is showing about 3 dB of headroom on most radiated emission limits, which sounds okay until you account for production unit variation. There's one spike around 240 MHz we're blaming on the switching power supply. Our EMC engineer thinks it'll pass, but I've heard that phrase before and ended up with a retest. We've got a ship date 10 weeks out, which leaves basically zero margin for a failure.
The lab is offering expedited slots that cut the timeline down to about 12 business days but add 40% to the cost. Trying to figure out if the premium is worth it or if we should just push the ship date. Has anyone actually used expedited slots and had a smooth experience, or do the labs just deprioritize the work again once you're in queue?
Expedited slots are worth it if your ship date is genuinely hard. We paid the premium on a deadline crunch and got results in 11 business days. Just make sure the device is actually ready before you burn the slot — we wasted one once because a firmware regression showed up on day two of testing.
Three dB of headroom sounds comfortable until your production units start behaving differently than your prototype. I'd want 6 dB before walking into a certified lab. Power supply spikes especially can shift between design iterations in ways that are hard to predict from pre-compliance results.
Don't forget the post-testing paperwork adds time too. Even after you pass the lab work, getting your FCC ID processed and authorization sorted can take another week or two. Factor that into your actual ship date math before you commit to anything externally.
6-8 weeks is pretty normal for a dual-band device right now, especially with how backed up accredited labs have been this year. We ran a similar product through last fall and it took 7 weeks start to finish even without any failures. If that 240 MHz spike shows up at the certified lab, add at least 2-3 weeks for a retest cycle.