Megger MTB 7671 CHECK BOX

[ELECNEWT]

Are these items worth the price?

Is the Megger MTB 7671 the best choice?

 

[Mike Johnson]

Thanks for your input, so all of the units available are much the same and one is not better than another? I like the idea of having a dedicated socket in an outbuilding that gets less use/abuse, the socket in my boiler house gets very little use and would be ideal, so that's sorted, just need to buy a card.

 

[pc1966]

Most modern instruments have very little (if any) adjustments possible. So calibration is more a "Is it broken?" sort of check.

The CalCard is a convenient way to check low and high R. Low-R should be obvious if it is OK by your probe null-ing process (e.g. are you seeing around 0.1 ohm without null and 0.00 with null?) but high-R insulation testing really needs something like a 10M resistor that is fine for 500V use, and the CalCard provides that.

 

[Mike Johnson]

With the advent of solid state electronics I would think that calibration drift is at a minimum in any modern instrument, as above any adjustments would be very little, the days of the wire wound pot have long gone.?