Power tool product inspection standard:

1, visual inspection
Check the assembly quality of the product. Parts should be assembled in place, no missing or misplaced, and the solid parts are not loose. The  surface of the impact wrench case has no scratches and no color  difference, and the mating surface has no obvious misalignment and no  burr.
2, no-load current, no-load speed measurement
The  impact wrench runs at no load for 15 minutes under normal conditions of  forward and reverse rotation, and then reads Q/CXJ03-16-2001 to take  the no-load input power.
3, reversing spark check
After  the product is operated at no-load for 15 minutes under rated voltage,  the spark under the brush shall not exceed the level 2 specified in  GB/T755.
4, switch on and off check
Each  impact wrench is connected to the power supply at the rated voltage,  and the forward and reverse rotations are turned on and off 5 times. The  continuity is normal and there is no stuck phenomenon.
5, noise check
During  the no-load operation, the operation sound of the monitor product  should be uniform and harmonious, and there should be no abnormal noise.
6, vibration check
During  the no-load operation, the vibration of the hand-tested product should  be free of abnormal vibration and obvious hand-feeling.
7, withstand voltage test
A  frequency of 50 Hz is applied between the contact pin of the product  power plug and the output shaft of the product, and the actual sine wave  voltage is 4000 V. The breakdown and flashover do not occur for 3 s,  and the withstand voltage breakdown current is set to 5 mA.
8. Other abnormal phenomena.
9, test conditions
When testing the impact wrench, the power supply voltage should be within ±10% of the rated voltage of the product.
10, test record
The factory test shall be recorded and at least the following items shall be recorded:
A. Appearance inspection results;
B, no-load current value;
C, no-load speed value (sampling 1%);
D, noise inspection results;
E, vibration test results;
F, the result of the reversing spark inspection;
G, withstand voltage test results.
H, rub the iron.
I, switch on and off check.
J, other abnormal phenomena.
Among  them, the no-load current and the no-load speed should record the  measured data, and other items allow the judgment of only pass or fail.
Note: The symbol "√" can be used to indicate pass, and the symbol "X" indicates failure. Products  that fail the test shall be re-adjusted and assembled according to the  corresponding return. After the repair is assembled, the test shall be  sent, and the returned product shall be re-inspected. The products that pass the test shall be delivered to the factory after the certificate is issued by the inspector.
11, finished product inspection
Test items
The  inspection items and test requirements shall be implemented in  accordance with the above requirements, and the rest shall be  implemented in accordance with the following requirements.
Packaging inspection
a)  The surface of the impact wrench is clean, free of oil, packing  documents, accessories, etc., and the nameplate and sign are firmly  attached, flat, and wrinkle-free. The name, specification and model match the product.
b) The inside and outside of the package are clean and the writing is clear. The strap is secure and tidy and the identification code is correct.
The sampling plan is based on the GB2828 one-time sampling plan: the normal inspection level S-4 is used to sample.
Inspection items: Inspection according to the inspection method of finished products.