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Ah, if you put a 1 Meg resistor in the circuit, and a neon lamp in parallel with it, you'll see 1 Volt of drop for every millamp of leakage current. Most neons won't ionize and glow below 70, 80 Volts or more. Would make the minimum reading 70 uA. The meter on mine pegs out at 50 uA. The tube tester uses a higher resistance than 1 meg for this test, most likely.

The actual current to light a neon glow lamp doesn't need to be much, so long as you shade it from room light. To make it bright still takes a few milliamps minimum.

73

[QUOTE="nomadradio, post: 763247, member: 22"] Ah, if you put a 1 Meg resistor in the circuit, and a neon lamp in parallel with it, you'll see 1 Volt of drop for every millamp of leakage current. Most neons won't ionize and glow below 70, 80 Volts or more. Would make the minimum reading 70 uA. The meter on mine pegs out at 50 uA. The tube tester uses a higher resistance than 1 meg for this test, most likely. The actual current to light a neon glow lamp doesn't need to be much, so long as you shade it from room light. To make it bright still takes a few milliamps minimum. 73 [/QUOTE]

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