Electrical history

[gar]

210810-641 EDT

1820 --- this may have been the first analog current measuring instrument --- a wire and a compass,

See https://www.aps.org/publications/apsnews/200807/physicshistory.cfm

.

 

[xptpcrewx]

210810-641 EDT

1820 --- this may have been the first analog current measuring instrument --- a wire and a compass,

See https://www.aps.org/publications/apsnews/200807/physicshistory.cfm

.

Analog meters used today (like the D’Arsonval Galvanometer), are basically just a wire and a compass.

 

[Besoeker3]

Analog meters used today (like the D’Arsonval Galvanometer), are basically just a wire and a compass.

Not that we use many of them these days. The last I used was an AVO8. Around 1970.

 

[xptpcrewx]

I still see these used all the time in new switchboard/switchgear installations, especially where generators are involved...

https://www.spectrumind.com/media/custom/upload/File-1524512388.pdf

 

[K8MHZ]

Not that we use many of them these days. The last I used was an AVO8. Around 1970.

In the 90's you had to use both analog and digital meters to properly diagnose fuel injection problems. One thing techs had to look for in the fuel injection signals was 'dithering', or rapid but slight changes in voltage. DVOM's were too slow, but we still needed them for accuracy when the changes stabilized. It was cool seeing both meters connected to the same source side by side and what they read.

 

[xptpcrewx]

Below is one of the last major projects I commissioned. This was for a new bio-diesel generation plant and outdoor substation for the utility company in Hawaii (island of Oahu). You can see the MV switchgear is furnished with analog meters.

 

[Besoeker3]

In the 90's you had to use both analog and digital meters to properly diagnose fuel injection problems. One thing techs had to look for in the fuel injection signals was 'dithering', or rapid but slight changes in voltage. DVOM's were too slow, but we still needed them for accuracy when the changes stabilized. It was cool seeing both meters connected to the same source side by side and what they read.

I appreciate your expertise in that field!