!!

Welcome to our Forum, extension and content sharing platform of Electrical Test and Measurement Product Reviews Blog.

 
Registration this is Free, we accept contributors of 17 years old and above. We do not accept registration with Gmail

Active since 7 June 2012  


Copyright Notice: Entire ITTSB.EU content & images they are copyright protected. - Forum search engine disabled to Guests - No need of you using Adblock software.

Author Topic: JJG 780-1992 Chinese Standard -Verification Regulation of AC Digital Power meter  (Read 813 times)

0 Members and 1 Guest are viewing this topic.

Online Kiriakos GR

  • Administrator
  • Hero Member
  • *****
  • Join Date: May 2012
  • Location: Greece
  • Posts: 2277
  • Country: gr
    • ittsb.eu
  • job title: Industrial Maintenance Electrician
JJG 780-1992 Chinese Standard this defines Verification Regulation of AC Digital Power meter

Standard Category: China Metrological Standards
Issued Date:1992-02-15
Implemented Date:1993-01-01
Issued by: The Standardization Administration of the People's Republic of China

As with all national standards you need to buy so to read.
But the most peculiar is that this Standard did not changed or got upgraded ever.
Still active at 2024.

And today Uni-Trend this using it, as proof of compliance for the domestic market of China.

If any reader is able to offer to us, a brief presentation of JJG 780-1992 ? Then please go a head.  :) 
WWW.ITTSB.EU   Industrial Test Tools Scoreboard  (Product Reviews Blog) / Editor in Chief.
The content of this Web site is copyright protected

Online Kiriakos GR

  • Administrator
  • Hero Member
  • *****
  • Join Date: May 2012
  • Location: Greece
  • Posts: 2277
  • Country: gr
    • ittsb.eu
  • job title: Industrial Maintenance Electrician
Within few hours of heavy duty internet search, I succeed finding the text about this standard in Chinese.
In brief, its about inspection and calibration procedures of AC Digital Power meter,  at 45~65Hz and the required precision of testing voltage and current load.

But hey,  what is this then GB/T 17215-2002 and latest revision ?
https://www.ittsb.eu/forum/index.php?topic=1934.0

I have the impression, that in China mainland there was a battle for years, of whom will be highest in rank standardization organization.
National Institute of Metrology of China VS Government VS others ...

Either way, anyone whom has plans to export Chinese technology in EU, he is obligated to seek compliance according to IEC latest active standard.
Imported technology based at expired standards, this is a huge problem.

The item : AC Digital Power meter
It could be wrongly calibrated   (within EU calibration lab it should inspect three samples and deliver relative verification)
Accuracy specifications might not be tight enough ( Nice looking on paper but not real ).

And finally, this is sales price as new and resale value in the market of used instruments.
eBay and other internet based market places, they are full of used instruments, most of them made under expired standards.
These cannot be used at modern lab, these are good as museum exhibits.     
WWW.ITTSB.EU   Industrial Test Tools Scoreboard  (Product Reviews Blog) / Editor in Chief.
The content of this Web site is copyright protected

 

ITTSB.EU Blog

General Data Protection Regulation GDPR ITTSB.EU Home Page Reward us by a Donation - Sponsorship TsDMMViewer Data Logger for FLUKE 884xA

ITTSB Blog - Sponsors

protosnet.com - Internet solutions FLUKE benchtop DMM Repair Services

Recommended Links

Hellenic Accreditation System E.SY.D. Portal of city Volos - Greece Clean Up and Customize Facebook Firefox Backup Tool 32bit / 64 bit Winaero Tweaker = Win7 Fonts size fix