EE-RM-TP-99-500 COMMENT 30HH

1f30HH 

Alternative Standby definition and Measurement procedure based on IEC 59/297/CD 

1.14 "Standby mode" means the lowest power consumption mode which cannot be switched off 

or influenced by the user,'a non-operational mode not affected by the dishwasher's primary 

function which may persist for an indefinite time when the dishwasher is connected to the main 

electricity supply and used in accordance with the manufacturer's instructions. 

3.5 Standby power meter. The WattlWatt-hour meter shall have a resolution of 0.1 Watt or 

better and shall accumulate Watt-hours at a minimum power level of 20 milliWatts. The meter 

shall have a maximum error no greater than 1 % of the measured value. The WattlWatt-hour meter 

must be capable of operating within the stated tolerances for input voltages at up to five percent 

total harmonic distortion arid shall be capable of operating at frequencies from 47 hertz through 

63 hertz. Power measurements shall have a crest factor of not less than 5 at RMS currents of 

two amps or less. 

4.4 Standby power. Connect the dishwasher to a watt/watt-hour meter as specified in section 3.5. 

Select the conditions necessary to achieve operation in the standby mode as defined in section 

1.14 of this Appendix. Monitor the power consumption, but allow the dishwasher to stabilize for 

at least 5 minutes. Then monitor the power consumption for at least an additional 5 minutes. If 

the power level does not drift by more than 1 % (from the maximum value observed) during the 

later 5 minutes and there is no cyclic or pulsing behavior of the load, the load can be considered 

stable and the standby power can be recorded directly from the instrument at the end of the 5 

minutes. Otherwise, if power varies over a cycle, the energy must be accumulated over a period 

of one or more complete cycles in order to get a representative average value, but not less than 5 

minutes. Determine the average power by dividing the accumulated energy by the time for the 

monitoring period. 

Note: Text in Italics is unchangedfrom language presented in the NOPR. 

Text not in' italics is new language to accompany the new proposed definition of standby. 

mode. 

The following is the lEe Draft Definition of "Standby mode": 

2 Definitions 

For the purpose of this Standard the following definitions apply. Terms defined in lEe 60050 International 

Electrotechnical Vocabulary also apply. 

2.1 

Standby mode 

the lo~est power consumption mode which cannot be switched off (influenced) by the user and that may 

persist for an indefinite time when an appliance is connected to the main electriCity supply and used in 

accordance with the manufacturer's instructions. 

Note: The standby mode is usually a non-operational mode when compared 10 the intended use of the appliance's primary 

function. 

The standby power is measured in Watts. 
EE-RM-TP-99-500 COMMENT 30HH

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This methodology may only be used where the mode and measured power are stable. A variation of less 

than 1 % in the measured power over 3 minutes is considered stable for the purposes of this standard. 

Active power readings may be used in this case. 

Connect the appliance (equipment) to the metering equipment. Select the mode to be measured. Monitor 

the power consumption but allow the appliance (equipment) to stabilize for not less than 5 minutes. 

Where the power meter reading is stable and where there is no cyclic or pulsing behaviour of the load, 

the active power reading for the load may be recorded directly from the instrument. If this reading is 

confirmed as stable after a further 5 minutes of operation, this can be recorded as the measured power 

for the relevant mode. 

4.3.2 All other measurements 

This methodology shall be used where either the mode or measured power is not stable. However, it 

may also be used for all stable modes and is the recommended approach if there is any doubt regarding 

the behavior of the appliance or stability of the mode. Average power readings or accumulated energy 

over a user selected period are used in this case. 

Connect the appliance (equipment) to the metering equipment. Select the mode to be measured (this may 

require a sequence of operations and it may be necessary to wait for the equipment to automatically enter 

the desired mode) and monitor the active power. Average power is determined using either the average 

power or accumulated energy approaches outlined below. 

Average power approach: where the instrument can record a true average active power over a user 

selected period, the period selected shall not be less than 3 minutes (except if there is an operating cycle 

- see below). 

Accumulated energy approach: where the instrument can accumulate energy over a user selected 

period, the period selected shall not be less than 3 minutes (except if there is an operating cycle - see 

below). The integrating period shall be such that the total recorded value for energy and time is more than 

200 times the resolution of the meter for energy and time. Determine the average power by dividing the 

accumulated energy by the time for the monitoring period. 

Note 1 • To ensure consistent units, it is recommended that Wh and hours be used above, to give Watts. 

Note 2: Example 1 • if an instrument has a time resolution of say 1 second, then a .minimum of 200 seconds (3.33 minutes) is 

required for integration on such an instrument. Example 2 - if an instrument has an energy resolution of say 0.1 mWh, then a 

minimum of 20 Wh is required for an integration on such an instrument (at a load of 0.1 W, this would take about 12 minutes, at 1 

Watt, this would take 1.2 minutes). Note that both the time and energy resolution requirements have to be satisfied by the 

reading. 

If the power varies over a cycle (Le. a regular sequence of power states that occur over several minutes 

or hours), the period selected to average power or accumulate energy shall be one or more complete 

cycles in order to get a representative average value. 

Instruments for Power Measurements 

Generally. a digitial power analyser with a fundamental pow~r accur~cy o! O.S:Yo or better wil.1 comfortably 

meet the instrument specification and measurement uncertamty reqUired In thiS standard. It IS not usu~lIy 

possible to meet these requirements (either the required accuracy or the measurement method) uSing 

traditional rotating disk kWh meters. 

The following broad recommendations are made regarding power measurement instruments: 

• Power resolution of 1 mW or better; 

• An available current crest factor of 3 (or more) at its rated range value; 

• Minimum current range of 10mA (or less); 

It is also desirable for measurement instruments to be able to average active power accurately over any 

user selected time interval (this is usually done with an internal math's calculation dividing accu.mulated 

energy by time within the meter, which is the mos~ accur.ate approach). As an alternative, .the 

measurement instrument would have to be capable of integrating energy over any user selected time 

interval with an energy resolution of less than or equal to 0.1 mWh and integrating time displayed with a 

resolution of 1 second or less.