YY/T 0291-2016Environmental requirements and test methods for medical X-ray equipment (English PDF)

5.2.4 Power supply adaptability

5.2.4.1 The power supply of equipment is set at 110% and 90% of rated working voltage, supply frequency 50 Hz ± 1 Hz (if necessary). Maintain the voltages for at least 15 min and then test the relevant test items specified in product standard.

5.2.4.2 For equipment having special requirements for power supply frequency and voltage, its working range of frequency and voltage can be specified otherwise in product standard.

6.1 Test procedure and test sequence

6.1.1 Test procedure

Each test normally includes the following procedures.

a) pretreatment (if necessary);

b) initial detection (if necessary);

c) test;

d) intermediate detection (if necessary);

e) recovery (if necessary); f) final detection.

6.1.2 Test sequence

When multiple tests are conducted for the same equipment, tests shall be normally conducted in the following sequence.

a) rated working low temperature test;

b) low temperature storage test;

c) rated working high temperature test;

d) high temperature storage test;

e) rated working damp heat test;

f) damp heat storage test;

Under the condition of normal package of equipment, equipment shall be fixed to the rear part of truck in accordance with the sign "UP" location. The load of truck during test is 1/3 of the rated load. Test can be conducted using truck or transportation test apparatus.

After test, test whether equipment fasteners become loose and conduct test items in accordance with product standard.

6.2.4 Power supply adaptability test

This test is normally conducted during rated working low temperature test and rated working high temperature test. During test, connect the power cord of equipment to an adjustable power supply; maintain the output frequency of the adjustable power supply at the rated product frequency; set voltages at 110% and 90% of rated product voltage; maintain the voltages at least 15 min; and then conduct relevant test items specified in product standard.

6.3 Special circumstances

Consider the following circumstances.

a) climatic environment test only applies to those parts or components which may be subjected to the climatic conditions simulated by test;

b) equipment shall be placed in test chamber unpackaged, in the ready-for-use state, at a normal working position;

c) equipment accessories shall be tested along with equipment, unless they are specified otherwise in product standard;

d) the components which can be detached without using tools shall be detached and tested along with major parts;

e) if test can't be conducted without disassembling and reassembling, the time intervals between treatment and test and between test and detection shall be decided in accordance with the time of equipment handling, assembling and debugging;

f) if equipment (such as large equipment or equipment having special requirements for service environment) is inappropriate for some environment test items (such as rated working low temperature test, rated working high temperature test, rated working damp heat test and so on), the manufacturer shall provide specific test requirements and indicate in product standard;

g) if product standard has special requirements for environment test conditions, they shall be implemented as specified in product standard. When it is impossible to test the whole machine, product standard shall specify which key parts or components are to be tested;