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1555 Insulation Tester Manual Cal

 

Hi Cal Community,

Today we was attempting to build manual calibration procedures for the Fluke 1555 Insulation Tester I am following the Adjustment Procedure (1550C/1555 )

I was able to complete the HV adjustment I was unable to complete the current adjustment.

We are using a Fluke 5520A Calibrator, Snore Version 1.4.03 software package and a 5320A Multifunction Electrical Calibrator

The current calibration procedure ask to source 2mAdc but it did not stipulate at what voltage

 we first applied 10vdc sourcing from the 5220A calibrator in-line with a decade resistance box set @ 5k ohm thus should of given 2mAdc through Guard (green) and lo (black).

When attempting the current cal with the Snore program a dialogue box would inform us that the cal had failed.

 

Hi Cal Community,

Today we was attempting to build manual calibration procedures for the Fluke 1555 Insulation Tester I am following the Adjustment Procedure (1550C/1555 )

I was able to complete the HV adjustment I was unable to complete the current adjustment.

We are using a Fluke 5520A Calibrator, Snore Version 1.4.03 software package and a 5320A Multifunction Electrical Calibrator

The current calibration procedure ask to source 2mAdc but it did not stipulate at what voltage

 we first applied 10vdc sourcing from the 5220A calibrator in-line with a decade resistance box set @ 5k ohm thus should of given 2mAdc through Guard (green) and lo (black).

When attempting the current cal with the Snore program a dialogue box would inform us that the cal had failed.

So we therefore increased the voltage to 1000vdc and set the decade box to 500k ohm, after rerunning the test it was informing us that the calibration had passed.

The problems is when we connected the UUT 1555 insulation tester to the 5320A Electrical Multifunction Calibrator for verification the current reading on the UUT 1555 insulation tester was way out of tolerance.

It is my belief as we were only trying to logically deduct the voltage requred for the current calibration is not correct thus putting the wrong values in the digital offset tables.

Can anyone advise us on the correct voltage required to perform this test ?


 

Kind Regards

Nick Owen

Celemetrix

So we therefore increased the voltage to 1000vdc and set the decade box to 500k ohm, after rerunning the test it was informing us that the calibration had passed.

The problems is when we connected the UUT 1555 insulation tester to the 5320A Electrical Multifunction Calibrator for verification the current reading on the UUT 1555 insulation tester was way out of tolerance.

It is my belief as we were only trying to logically deduct the voltage requred for the current calibration is not correct thus putting the wrong values in the digital offset tables.

Can anyone advise us on the correct voltage required to perform this test ?


 

Kind Regards

Nick Owen

Celemetrix

1 comment

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William (Bill) Spath

Issue:  The method of using a resistor to establish 2 mA will not work because the 1555 resistance changes during the adjust.

Do you have a current source that you can use for the adjust?

I do know that Snorre does work to do the adjust.  

That the manual test does work, and that the 1550C/1555 test box does work.

 

 

Customer response:

Many thanks for your help. We have used a 725 Process Calibrator to source the 2mA and it has resolved the problem. We now have a correctly adjusted and working 1555.

 

Thanks for all your help.

 

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