Yep, possibly, but I'm noticing that moving them around etc. , is having a trivial effect on the readings.
But you are right, I know I will have to adjust them further, once they are in place. This calibration was more of an initial one, and also to see how they all behave with the same load which will be difficult to do once the system is mounted. This gives me an opportunity to see if whether channel selection on the ADC , and things like adjacent placement and temperature have effects that I can get a grip on before it goes in place.
Also , once the system goes in, one of the Halls will be tougher to calibrate, as it also monitors the consumption of the system. I do have DC clamp ammeter that helps, but its resolution is not as good as the system, so it gets me to ballpark.
For everyone else who might be interested in the details. The halls are 4 , 100 Amp Amplocs and 1 200Amp Amploc
I'm sampling across all channels at roughly 5Hz for ~ 300 samples per minute on each channel
The Labjack allows you to set ADC resolution and settling time, and I'm around 20bits on the unit, note this is not the effective resolution of the measurements, I'm nearer 16bit at the end. The unit can sample to 24bit, but the higher the bit depth , the slower the sampling time.