Ferrites, and buzzing
Hoping to start a discussion, not solve any issue here.
I have a "watt's up" wattmeter clone from Windy Nation. This came with 8awg leads instead of the usual 12awg.
I'd found its AH and KWH figures were straight from bizzarro world when tested against other meters, and gave up on it. But it is still useful for voltage and wattage, So I put it in between the Screwy31 and the schumacher Sc2500a "intelli" charger whose display is now toast, but other wise operates as it did new.
So this wattmeter on the schumacher, the voltage and amperage readings just bounce around. At 2 amps it will bounce from 0.07 to 8.82 amps and voltage will bounce +/- 0.5 volts. Another wattmeter inline is nice and steady.
When placed between battery and load this wattmeter reads amps volts fairly accurately, but in between schumacher and battery and it goes battcrap crazy.
So I have some Snap on Ferrite cores that fit over both 8awg leads together, and after doing so, the battcrap crazy level of 10, falls to a level 7.
Eyebrow raised, but Eh, shoulder shrug. Screwy31 is charging. Voltage with Schumacher unplugged from 120vAC still accurate.
Today, I found another snap on ferrite core, slightly smaller inner diameter. I thought perhaps more ferrites would perhaps help soothe the battcrap crazy wattmeter. It would not fit over both 8 awg wattmeter wires, or both 10AWG wires coming out of Schumacher. So I go snap it over one 10awg Schumacher output wire.
And as soon as the two halves get close to each other the schumacher starts buzzing loudly, Surprisingly loud. Open core back up and noise attenuates. I can modulate the volume of the buzzing just by how closed the snap on ferrite is over either + or - output wire.
Sounds like 60Hz.
It seems like I can actually feel the ferrite vibrating in my fingers.
What The pluck is going on?
I have a "watt's up" wattmeter clone from Windy Nation. This came with 8awg leads instead of the usual 12awg.
I'd found its AH and KWH figures were straight from bizzarro world when tested against other meters, and gave up on it. But it is still useful for voltage and wattage, So I put it in between the Screwy31 and the schumacher Sc2500a "intelli" charger whose display is now toast, but other wise operates as it did new.
So this wattmeter on the schumacher, the voltage and amperage readings just bounce around. At 2 amps it will bounce from 0.07 to 8.82 amps and voltage will bounce +/- 0.5 volts. Another wattmeter inline is nice and steady.
When placed between battery and load this wattmeter reads amps volts fairly accurately, but in between schumacher and battery and it goes battcrap crazy.
So I have some Snap on Ferrite cores that fit over both 8awg leads together, and after doing so, the battcrap crazy level of 10, falls to a level 7.
Eyebrow raised, but Eh, shoulder shrug. Screwy31 is charging. Voltage with Schumacher unplugged from 120vAC still accurate.
Today, I found another snap on ferrite core, slightly smaller inner diameter. I thought perhaps more ferrites would perhaps help soothe the battcrap crazy wattmeter. It would not fit over both 8 awg wattmeter wires, or both 10AWG wires coming out of Schumacher. So I go snap it over one 10awg Schumacher output wire.
And as soon as the two halves get close to each other the schumacher starts buzzing loudly, Surprisingly loud. Open core back up and noise attenuates. I can modulate the volume of the buzzing just by how closed the snap on ferrite is over either + or - output wire.
Sounds like 60Hz.
It seems like I can actually feel the ferrite vibrating in my fingers.
What The pluck is going on?
