I choose BNC because was afraid regular cable would pick up noise. As seen in my "drift test" it's quite noisy even with BNC. Measurements below reflect noise peaks. Cursors on 1Hz low pass filtered yellow trace reflect DC drift. Conclusions:
- It's 20A/60A DC clamp, so needs attention in mA range with filtering etc
- Unless interested in DC switch scope to AC coupling
- warm it up ~0.5h for precise stuff, zero again
- if zero-button does not cut it, apply channel zero on scope
Note that 16.75mA DC drift recorded is ~0.067% of full range (-5...20A).