Two common drop forms for non-packaged items

What is the method of object drop tester? Kunshan Haida instrument experts pointed out that there are two methods for testing non-packaged objects:

The first method is usually used to simulate the free fall that the unpackaged product may undergo during handling. The sample is usually dropped from the specified height to the prescribed surface twice in the prescribed posture.

The second method is usually used to simulate the repeated free fall that a connector attached to a cable, a small remote control, etc. may experience in use. The test sample was repeatedly dropped from the prescribed height onto the prescribed surface. It is achieved by using suitable equipment such as (rotating) rollers.

Method One: Free Fall

1. Purpose

Determine the suitability of the product to fall due to rough handling during handling, or determine the minimum level of security required for safety.

This test is mainly used for non-packaged test samples and test samples that can be packaged as part of the sample in the transport case.

2 test conditions

2.1 Test surface

The test surface should be a smooth, hard, rigid surface made of concrete or steel. When necessary, the relevant specifications may specify other surfaces.

2.2 Drop height

It refers to the height between the test surface and the sample site closest to it when the test sample is suspended before falling.

2.3 release method

The method of releasing the test sample shall allow the test sample to fall freely from the suspended position. When releasing, minimize interference.

3 Severity

The drop height should be selected from the following values:

(25), 50, (100), 250, (500), (1000) mm.

The parenthesized values ​​are preferred values.

Note: Heavy equipment should not withstand higher severity levels.

4 Initial inspection

According to the provisions of the relevant specifications on the appearance of the sample inspection, electrical properties and mechanical properties.

5 Conditional test

5.1 The samples shall be allowed to fall freely in the normal transport and use posture as specified in the relevant specifications.

5.2 Unless otherwise specified in the relevant specifications, test samples shall be dropped twice from each specified position.

6 Last test

Test samples shall be examined for appearance, electrical properties and mechanical properties as specified in the relevant specifications.

7 What the relevant specification should say

When the relevant specification adopts this test, the following details shall be given:

a) test surface, if not concrete or rigid;

b) drop height;

c) initial detection;

d) The attitude of the test sample when it began to fall;

e) number of falls (if not twice);

f) Last test (see Chapter 6).

Method two: repeated free fall

8 purpose

Cable-adapted component-type devices, such as connectors and small remote controls, that may be frequently dropped onto hard surfaces, are subject to repeated fall-out suitability.

9 General instructions

The test method is to drop the test sample from the prescribed height to the hard surface by the prescribed number of times. In order to simulate the actual conditions, each test sample should be tested individually and usually have a section of cable. The results of the test shall be assessed by the changes in the mechanical and electrical properties of the test sample.

10 Test Equipment Description

According to the relevant specification requirements, the test equipment shall cause each test sample to drop from the prescribed height by a specified number of times. Appendix A, Figure A1, illustrates a suitable pattern for using roller equipment.

11 Severity

11.1 Drops

The relevant specification shall select the total number of trials from the following values ​​based on the intended use of the test sample:

50, 100, 200, 500, 1000 times.

11.2 Drop height

Drop height: 500 mm.

11.3 Falling frequency

The drop frequency is about ten times per minute.

11.4 Test Surface

Unless otherwise specified in the relevant specification, the test sample shall be dropped on a smooth, hard, firm test surface of a 3 mm thick steel plate lined with a plank of 10 mm to 19 mm thick.

12 Initial inspection

The test sample shall be inspected according to the relevant specifications, and the electrical properties and mechanical properties shall be tested.

13 Condition test

The test sample shall be placed in the test equipment subject to a specified number of drops. When the test sample comes with cables, the relevant specification should specify the type of cable used. If no other regulations exist, the cable length is 100 mm.

14 Last test

Test samples should be visually inspected according to the requirements of the relevant specifications, and the electrical and mechanical properties should be tested.

The specification should state the conditions for receiving or rejecting the sample.

15 What the relevant specifications should say

a) Initial detection;

b) the number of falls;

c) The last test;

d) The cable type to be connected.