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Earphone quality check:

The QC check inspections for earphones will check according to below checklist:

Quantity NOT OK
Production Status/specification OK
Packing and Packaging OK
Markings OK
On-site tests & special requirement OK
AQL Workmanship Within AQL

There are below onsite quality checking list for earphone QC inspections:

earphone quality check

Please find below for an examples of the quality tests for earphone inspections:

Perform a carton drop test: 10 drops from the correct height based on carton weight as defined in ISTA 1 A(6 faces, 3 edges,1 corner) - On 3 cartons – packed products should not get damaged  On 3 cartons, 61 cm height x 10 times PASSED
Perform a barcode-scanning test-The barcode should be scannable and have the correct number.-S2 No barcode N/A 
Perform a rub test and an adhesive test-Perform the rub test and adhesive test on any and all printing found on the item-S2 On 13 pcs PASSED 
Wire pull test-S2 On 13 pcs, factory no puller available for test, only normal force by hands PASSED
Internal checked on 3 pcs On 3 pcs PASSED 
Function checked on 50 pcs On 50 pcs PASSED 
Perform on-site testing for impedance, sensibility and Frequency, pls input actual data in below table.  On 200 pcs On 200 pcs, please refer to below table FAILED

An earphone onsite testing results:

Earphone tests Impedance Margin Sensibility Frequence Input power Wire length Plug type Speaker D
specs 32-39 OMHS ≯1.8OM HS 108dB+/-10% 20-20kHZ 40mw 1.6m 3.5mm stereo 10mm
Unqualified qty 0 0 0 0 0 0 0 0
Unquality % 0 0 0 0 0 0 0 0
Sample 1 37.56 37.50 0.06 104.6 106.7 Ok 40 1.60 All 3.5mm All 10mm
Sample 2 36.83 37.58 0.75 103.8 105.6 Ok 40 1.64

3rd party preshipment products goods factory onsite inline final Random AQL PSI TPI FRI DUPRO third party on-site in-line pre-shipment QA QC control assurance inspection services in China India Vietnam Thailand Malaysia Bangladesh Taiwan.