1.05N/Mm Spring Constant IEC 60335-2-25 90N Spring Dynamometer

Operation steps:

Following is excerpted from IEC 60335-2-25:2015 clause 21.101:

Hinged doors are positioned approximately 30°before the fully open position. Sliding doors are positioned so that they are approximately two-thirds open. A force of 35N is applied to the inside surface of a hinged door at a point 25mm from its free edge or to the handle of a sliding door.

The force is applied by means if a spring balance having a spring constant of 1.05 N/mm. It is initially applied with an opposing force applied to the other side of the door or handle. The opposing force is them removed to allow the door to complete its travel to the fully open position.

The test is carried out five times.

The test is repeated on doors of stationary appliances and built-in appliances except that

the door is initially placed midway between the fully open and closed positions;

the applied force is 1.5 times the force required to open the door or 65N, whichever is greater. However, if the force cannot be measured or if the door is opened indirectly, the 65

N force is applied.

The test is carried out five times.

Doors are placed midway between the fully open and closed positions. A closing force of 90N is applied to the outside surface of a hinged door at a point 25mm from the free edge or to the handle of a sliding door, initially with the opposing force as described above.

This test is carried out 10 times.