Retesting previous work

[chris013]

If you were to retest jobs that had been tested 5 years previously would you expect Ze to be lower or higher .RCD times to be lower or higher .Thanks Chris

 

[davesparks]

i could use my fluke for the continuity tests as it has been calibrated so it would comply

But does it produce the 200mA test current?

 

[Andy78]

But does it produce the 200mA test current?

This is the line I was thinking along. I checked the reg and it is only recommended however and not required.

 

[davesparks]

This is the line I was thinking along. I checked the reg and it is only recommended however and not required.

But why would you not follow such a sensible recommendation?

 

[Andy78]

But why would you not follow such a sensible recommendation?

Ask Shanky I suppose. I have always been taught "a multimeter cannot and must not be used for any recorded test results" and that's the way I still work.

 

[shanky887614]

I think you will find that an instrument calibrator is quite a specific (and costly) instrument. It is not just an ordinary multimeter.

and i think you will find that you dont need an instrument calibrator to calibrate instruments.

a desktop multimeter is acurate enough and after calibration can be used to calibrate other equipment.

yes a proper calibration equipment will allow testing of things like earth loop etc but we are talking about a device to measure resistance.

 

[shanky887614]

Ask Shanky I suppose. I have always been taught "a multimeter cannot and must not be used for any recorded test results" and that's the way I still work.

your cheap crappy bnq multimeter shouldnt be used i agree

 

[davesparks]

your cheap crappy bnq multimeter shouldnt be used i agree

What criteria do you look for in the multimeter? You can't base it on cost!

 

[Andy78]

your cheap crappy bnq multimeter shouldnt be used i agree

I don't posses a cheap crappy B&Q multimeter, and I don't know why you would make that assumption.

 

[Former Sponsor TM]

A multifunction calibrator used to check your MFT is not a bench top multimeter. Calibrators source voltage, current, resistance, frequency etc, a bench multimeter will only read these.

Hand held multimeters usually generate pulses of current of around 15mA which is ok for measuring inductive loads such as checking the continuity of a motor coil, but a continuity or bond test carried out in an electrical installation needs to be compliant with the 17th edition, which requires that the meter performing the continuity measurement delivers a test Current (I) of > 200mA whilst delivering a test Voltage (V) between 4V to 24V.