Meter calibration

Chris


My calibrator is On Site Calibration Services. Mike Olding top bloke ex RAF Chief Tech. Who comes to you. Each year he comes to me where I host a calibration coffee morning with Mrs P supplying the cake for friends dropping in with their test kit. 


Covid knocked this years event on the head and Mike is not on the road at the moment for the same reason. Now Boris is allowing me to go to Norfolk I will drop off my kit and a mates to him just across the border in to Lincolnshire 


I know Mike takes his big box of calibration kit back to the manufacturer to be calibrated to National Physical Laboratory standards. He stays in a hotel nearby as he does not like it being out of his control.


Yes test kit rarely does go out of calibration. I have an LTW loop tester that started reading high on my test box without any rough treatment. I will get it back to Megger for repair. On any tester the weak points are the lead sockets. Usually a cotton bud dipped in switch cleaner cleaning out all the grunge inside sorts the problem. The same with fuse carriers inside and battery connections. Good quality batteries in good condition are a must.


I notice my Megger reads high on loop testing when the rechargeable batteries run down. Switching ranges when connected to a live supply is never a good idea.


Whilst the meters generally stay in calibration the lead sets are the weak link. Old and/or cheap leads go high resistance so regular checks on a check box are essential. The Kyritsu leads from Kewtech beat the pants off anyone elses leads whatever the make of the test kit? Get the ones marked Kyritsu on the plugs not Kewtech. Expensive but very reliable.

Chris


My calibrator is On Site Calibration Services. Mike Olding top bloke ex RAF Chief Tech. Who comes to you. Each year he comes to me where I host a calibration coffee morning with Mrs P supplying the cake for friends dropping in with their test kit. 


Covid knocked this years event on the head and Mike is not on the road at the moment for the same reason. Now Boris is allowing me to go to Norfolk I will drop off my kit and a mates to him just across the border in to Lincolnshire 


I know Mike takes his big box of calibration kit back to the manufacturer to be calibrated to National Physical Laboratory standards. He stays in a hotel nearby as he does not like it being out of his control.


Yes test kit rarely does go out of calibration. I have an LTW loop tester that started reading high on my test box without any rough treatment. I will get it back to Megger for repair. On any tester the weak points are the lead sockets. Usually a cotton bud dipped in switch cleaner cleaning out all the grunge inside sorts the problem. The same with fuse carriers inside and battery connections. Good quality batteries in good condition are a must.


I notice my Megger reads high on loop testing when the rechargeable batteries run down. Switching ranges when connected to a live supply is never a good idea.


Whilst the meters generally stay in calibration the lead sets are the weak link. Old and/or cheap leads go high resistance so regular checks on a check box are essential. The Kyritsu leads from Kewtech beat the pants off anyone elses leads whatever the make of the test kit? Get the ones marked Kyritsu on the plugs not Kewtech. Expensive but very reliable.