Product Qualifying Criteria (5th Batch)
Date of Release : 14 July 1995

Category
Qualifying Criteria (Part I )
1) Computer System Unit (GLS-019-05) 30 watts or less when idle or low power state
2) Computer Monitor (GLS-020-05)

30 watts or less when idle or low power state
3) Computer System With "Built-In" Monitor (GLS-021-05) 60 watts or less when idle or low power state

 

Definitions
a)

System Unit

  Comprising a motherboard with Central Processing Unit (CPU), power unit, hard disk drives and floppy disk drives.
b) Computer Monitor
  External monitor or computer screen
c) Computer System With "Built-In" Monitor
  Comprising a System Unit and a Monitor that is included in the computer casing and powered through the System Unit.

 

Testing Requirement
In order to apply for the GreenLabel, the applicant needs to submit a sample for test at accredited SAC-SINGLAS (The Singapore Laboratory Accreditation Scheme) laboratories. The test shall be carried out according to the following test conditions :
1) Total line impedance should be less than 0.25 O in total.
2) Total AC source harmonic distortion should be less that 5%.
3) The input AC voltage should be in the range of 240 volts ± 5 volts.
4) The AC source frequency should be in the range of 50Hz ± 3Hz.
5) The ambient temperature should be in the range of 300°K ± 5°K.
6) During the test, both the system unit and the monitor should be in the idle state
7) The monitor must be back instantly when keyboard or mouse activities are detected. The power management software/hardware should not interfere with the user programme being executed.
8) During the test, the system should be fully-equipped such as installing RAM to its full capacity, plugging in the math coprocessor, etc
9)

The measured power can be obtained directly if a Watt meter is used. Or, if a combination of voltage, current and power factor meters are used, the measured power can be calculated as

Power = V x 1 x d

where V is the single phase line voltage, 1 is the line current and d is the power factor. If the power factor meter is not used during the measurement, the power factor d can be assumed to be 0.65 unless it is know obviously that a power factor correction' unit is installed in the switched-mode power supply system. In this case, the power factor can be assumed to be 0.85.

 

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