Full scale or readings? about current and voltage accuracy of PM8000 and PM5000.

[suzuki-takahir_1]

Hello.

Our customer would like to evaluate PM8000 and PM5000 current and voltage accuracy (error) as their internal test.

              PM5100, 5300     PM5500          PM8240

Current       0.5%              0.15%              Class 0.2 as per IEC 61557-12

Voltage       0.5%              0.1  %              Class 0.2 as per IEC 61557-12

However we couldn't understand that these accuracy values (error) based "Full scale" or "readings" from its specification or its standards.

Could you please advise us whether we should use Full scale or readings?

[DanL]

The compliance to IEC61557-12 for a particular accuracy class indicates the performance level is garunteed under a very wide range of signal conditions and various operating conditions for that parameter.

For example, Class 0.2% will be better than +/-0.2% of reading under nominal and near nominal conditions. Some allowance for de-rating is specified in the standard under more extreme conditions.

Hope this helps,

Dan

http://www2.schneider-electric.com/resources/sites/SCHNEIDER_ELECTRIC/content/live/FAQS/234000/FA234...
Product	Parameter	Operating Range	61557-12
PM5100 / 5300	Voltage	20 - 347V	Class 0.5
PM5100 / 5300	Current	0.05 - 8.5A	Class 0.5
http://download.schneider-electric.com/files?p_Reference=PLSED303023EN+Datasheet&p_EnDocType=Technic...
Product	Parameter	Operating Range	61557-12	Typical accuracy (under nominal/ideal conditions)
PM800	Voltage	10 - 277V	Class 0.2	0.075% rdg
PM800	Current	0.5 - 10A	Class 0.5	0.075% rdg
http://www2.schneider-electric.com/resources/sites/SCHNEIDER_ELECTRIC/content/live/FAQS/234000/FA234...
Product	Parameter	Operating Range	61557-12	Typical accuracy (under nominal conditions)
PM5500	Voltage	20 - 347V	Class 0.2	0.10% rdg
PM5500	Current	0.05 - 10A	Class 0.2	0.15% rdg
http://www2.schneider-electric.com/resources/sites/SCHNEIDER_ELECTRIC/content/live/FAQS/281000/FA281...
Product	Parameter	Operating Range	61557-12	Typical accuracy (under nominal conditions)
PM8000	Voltage	10 - 347V	Class 0.2	0.10% rdg
PM8000	Current	0.05 - 10A	Class 0.2	0.10% rdg