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Isolation Transformer, Variac and Dimmer Bulb Tester
Isolation Transformer, Variac and Dimmer Bulb Tester
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Old 22nd August 2018, 12:20 PM   #21
anatech is offline anatech  Canada
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Isolation Transformer, Variac and Dimmer Bulb Tester
Hi John,
You control the current with the variac. Using a bulb anywhere introduces a variable and you really don't know what is going on with the capacitors.

-Chris
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Old 22nd August 2018, 12:25 PM   #22
John Ess is offline John Ess
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So it's a misconception that the variac just controls voltage and the bulb acts as a current limiting device?
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Old 22nd August 2018, 12:28 PM   #23
anatech is offline anatech  Canada
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No, the resistance of the load works with the applied voltage to control the current. That way you get an accurate indication of the current drawn by the load.

-Chris
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Old 22nd August 2018, 11:36 PM   #24
PRR is offline PRR  United States
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I believe the lamp will react faster than my hand on the knob.

Yes, low-volt and lamp introduce great uncertainty in what is going on; this is just for smoke-test.
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Old 22nd August 2018, 11:39 PM   #25
TonyTecson is offline TonyTecson  Philippines
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yes, i use a 100 watt bulb, at 230 volts, when there is a fault in the equipment,
then that is just 43mA if current, further damage is averted and smoke is not let out...
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Old 23rd August 2018, 04:11 AM   #26
PRR is offline PRR  United States
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Quote:
Originally Posted by TonyTecson View Post
...i use a 100 watt bulb, at 230 volts ... ...that is just 43mA if current....
434mA.
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Old 23rd August 2018, 04:13 AM   #27
TonyTecson is offline TonyTecson  Philippines
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yes, i flunked math in school...
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Old 23rd August 2018, 01:16 PM   #28
anatech is offline anatech  Canada
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I just watch the current meter. If it goes up rapidly you can stop before you reach 10 VAC or even lower.

-Chris
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