Hi

We currently use the Pico PP264 60amp (switchable to 20amp) amp clamp, in 20amp range using 10 windings to increase resolution, but find the clamp (we have 2 so it's not one clamp being in need of repair!) to wander over long periods. It wanders regardless of windings, the windings are used purely to increase the accuracy.

We use it to measure parasitic current drain, so once the car doors are locked it is 1amp or less we are measuring with the interested area being 20-150ma in 5ma steps max.

Our cars should have a residual drain of 40-55ma max, it's easy to see a 150ma drain if it's there all the time, but we see cars that have long term (ie after 24hours) intermittent system activations causing parasitic drains. being able to accurately monitor the drain for 2-3 days (using mains powered clamps if needed to maintain power).

Knowing accurately how big the drain is and for how long is helpful in finding the fault. An extra 100ma for every 4th hour verse a 2amp burst for 15 minutes once every 6 hours. It's not a daily requirement but we get half a dozen or more cases a year, with 2-3 needing very extended testing times.

We have been told about the AEMC K110 MicroProbe, which appears to be more suitable than the Pico unit, but I'd like to know if anyone has used it, but especially for long continuous periods at the 40ma levels? The wandering and/or stability of the inductive loop is key ...

Any advice of alternatives or feedback on the K110 MicroProbe would be appreciated!

Thanks

Richard