How to test for correct voltage (diy)

[Christopher Parkinson]

why not just use a boost transformer ?
Use this for the critical loads,
And use the low mains for non critical

Not sure what this all means but it sounds like it might be a solution. Can you explain please? What is a boost transformer? What are critical loads? What is low mains? What is non critical?
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The ballast is electronic. 110v . 50/60 HZ . Lamp power 155w (The lamp is actually 160w but it works ok with 230v. I tested the UV output and it matches a magnetic ballast made for the lamp). Lamp current 0.80 - 0.90a
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This is the transformer I'm using: Eagle (230V to 110V) 300W UK to USA Step-down Voltage Converter Transformer 689549632981 | eBay - https://www.ebay.co.uk/itm/Eagle-230V-to-110V-300W-UK-to-USA-Step-down-Voltage-Converter-Transformer/124059605838?hash=item1ce2875b4e:g:OCwAAOSwovJeK0po

 

[Lucien Nunes]

Good, frequency is not the issue as it is an electronic ballast. If the voltage from the transformer output is a little out of spec that is unlikely to affect the tube performance as the ballast provides regulation, but it is worth checking the voltages both into and out of the transformer.

I note that the lamp wattage stated on the ballast does not match the lamp exactly. As far as the power is concerned that is unlikely to be a problem, but it suggests that the ballast may have been made for a different type of lamp with a different arc voltage. Is this possible, i.e. that the ballast and lamp are not actually a matched set, just similar in wattage?

 

[Christopher Parkinson]

Good, frequency is not the issue as it is an electronic ballast. If the voltage from the transformer output is a little out of spec that is unlikely to affect the tube performance as the ballast provides regulation, but it is worth checking the voltages both into and out of the transformer.

I note that the lamp wattage stated on the ballast does not match the lamp exactly. As far as the power is concerned that is unlikely to be a problem, but it suggests that the ballast may have been made for a different type of lamp with a different arc voltage. Is this possible, i.e. that the ballast and lamp are not actually a matched set, just similar in wattage?

Yes. You are correct in assuming that the ballast and lamp are not a matched set, just similar in wattage. Re: different arc voltage, I don't know what that means. The engineer at the manufacturer asked for the lamp specs which I've sent to them.

 

[Lucien Nunes]

One possibility, then, is that they have specced a ballast that does not suit the lamp. It's a bit difficult to diagnose at a distance as there are many variables. Therefore, yes, eliminate supply voltage as a variable before proceeding, as you originally suggested.