Recently I have been doing some measurements with a multimeter on some new transformers for my company. Lately I have noticed the resistance of the multimeter in current mode (ammeter) has increased. Other multimeters measured less than 1 Ohm across the mA measurement points in mA Mode while the multimeters I am using are now showing 2,4 and 14 Ohm. The A Mode points still have low resistances. I have searched everywhere and not found a thing. I have been measuring mains for some of the tests.
Does anyone have an idea why this would be happening? I have checked fuses and they are fine.