Well. Set 110v, my variac is putting out 125v. Wow. I feel kinda stupid, but I assumed variacs put out the setting that they're on....so set at 110v would be out 110v.
Overall, my AC line appears to run between 120-130v.
Does the variac data state the reference input voltage?Well. Set 110v, my variac is putting out 125v. Wow. I feel kinda stupid, but I assumed variacs put out the setting that they're on....so set at 110v would be out 110v.
Overall, my AC line appears to run between 120-130v.
Unless there is a flat on the shaft for the setscrew in the knob, that knob could be pointing anywhere. Always verify with a meter.
BillWojo
What was your bad experience??Yeah, I have had (bad) experience with that high LA area voltage.
Does the variac data state the reference input voltage?
If 110 VAC, the ratio is 1/1 at that setting regardless of dial markings.
One of my variacs has a dial on which I've inked the 1/1 position, the other a voltmeter that I've corrected for age drift. The 2nd one has been mod'ed for a series lamp current limiting test with a bypass switch for the lamp.
At one point on the dial, the in/out voltage ratio is one to one. Measure the socket voltage, then measure the variac output voltage and match the socket voltage. That set point is a 1/1 ratio. The variac is an adjustable AC auto transformer that varies output to input by varying it's transformation ratio with a dial knob via a sliding tap that can go from zero to above the input tap. When the sliding tap is at the point of the input tap, the ratio is 1/1.Yep....lesson learned!
What was your bad experience??
I unfortunately don't have the data sheet. What do you mean ratio is 1/1?
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What was your bad experience??
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Good luck with your re-build! Share photos. I'd love to see how you do it.
The problem has to be a ground loop—it's audible more than 3' away with no sound playing. I have altecs, which are like 99db, but this is different than just normal amp noise. It also doesn't get louder with more volume.
I'm going to install some new power cords today. In-rush goes between AC Line and transformer—not in between line and fuse, correct?