self calibration Megger 1730

[alpha spark]

Hi folks got a mft 1730 in January been keeping tabs on the readings I've been getting and this month has slightly worried me from month 1-8 the zs was between 0.31to 0.38 but this month the zs was 0.56 I know it's not a million miles out also the continuity has started to give higher readings than you I tried contacting Megger a few weeks ago about zs being different to the fluke I have that said this is usual I dont know if there just telling lies it if this is true would like to think what you guys think before I contact them I know Steve has had problems with his

Thanks in advance

 

[alpha spark]

?

 

[Steve3948]

Hi folks got a mft 1730 in January been keeping tabs on the readings I've been getting and this month has slightly worried me from month 1-8 the zs was between 0.31to 0.38 but this month the zs was 0.56 I know it's not a million miles out also the continuity has started to give higher readings than you I tried contacting Megger a few weeks ago about zs being different to the fluke I have that said this is usual I dont know if there just telling lies it if this is true would like to think what you guys think before I contact them I know Steve has had problems with his Thanks in advance

Is this your monthly calibration proof reading, or just normal test results.

Half or full test reading.

 

[alpha spark]

Yes this is my monthly calibration proof reading

 

[alpha spark]

Got it before I joined forum so didn't know mm then I'll give them a bell tomorrow

 

[Steve3948]

I don't think you can compare readings with another MFT, especially if it's 1/2 rated test.

Continuity could be batteries or it could be a firmware issue, mine is with them now for new firmware where they have sorted the issue where if a long wonder lead was used, then the MFT powered off when it was next used the long lead was still stored in memory so would throw the next reading using normal leads even though it shows correct when shorting leads to get 0.0 ohms.

 

[alpha spark]

What happened last time Steve was doing a shop fit took a ze say the reading was 0.18 ohms went to take a zs at a radial 30 metres in length was getting a reading of about the same reading as the ze so got my old fluke out and that gave more reasonable readings

 

[Steve3948]

Alpha, was it 1/2 rated or full then.

I've given up with 1/2 rated, but will try it again after firmware upgrade, if no better I will go back to RCD by-pass method.

 

[alpha spark]

Hi Steve I have it on z on rhs dial and l- Pe on lhs dial

 

[apprentice87]

That is the no trip setting then....

john

 

[alpha spark]

http://www.test-meter.co.uk/products/17th-edition-test-equipment/multifunction-testers/megger-mft1730-multifunction-tester/

What do you use steve max z

 

[Joseph Howarth]

what firmware is your tester running on, mine was on 1.07 and it was giving odd readings on some tests, sent it to megger who updated it to 2.05 and this seems to of fixed the problem and they calibrated it for me as well.

Depending on the version they've been having some issues with 2wire no trip and Zs, and r1&r2

as far as i'm aware ; \

 

[alpha spark]

Not sure Joseph how do you find out what firm ware it is

 

[batty]

Alpha me and Steps have decided you need to get a Fluke.

 

[alpha spark]

I've got a fluke a 1653 but it's bout 5 years old now got it few year back but the continuity is shot to bits and didn't wanna pay

 

[batty]

Are you sure its not just your leads that is putting the readings out?

 

[alpha spark]

Pretty sure yes batty

 

[Steve3948]

Alpha me and Steps have decided you need to get a Fluke.

He already has one, but wanted to use a professional bit of kit, however like all top end stuff, like in Formula 1, the more complex the more temperamental.

Alpha as App87 said you are on half rated no trip and depending on make of RCD and appliances in circuit this can all effect the result. Some installations its fine others not so good but still within the requirements of BS7671.

I agree it's not ideal if previous models and other makes can give something near to normal on half rated, but I'm hoping that when I get mine back with the latest firmware this may have been improved.

In the meantime I will just keep soaking up the sun here in Cyprus, and hopefully when I get back I can stop doing RCD By-pass.

 

[Joseph Howarth]

turn the right dial to the wrench and select any function on the left one, it will say the firmware version followed by RST no

 

[alpha spark]

Cheers peeps will be using it later on so I'll give it a whirl on max z