Re: How to Test an NE75 Neon Lamp
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Ozan, David,
Thanks so much for the replies.? The two resistors (R135 and R136) are both mounted with the lamp so I can power it with R135 in series.? Since that lamp should be lit in both NORMAL and SINGLE and both modes appeared to be working, then I'm even more suspect of the lamp.? Testing it out of the circuit will confirm that one way or the other.
Thanks guys, Barry - N4BUQ
From: "Barry" <n4buq@...>
To: "HP-Agilent-Keysight-equipment" <[email protected]>
Sent: Monday, March 25, 2024 11:33:32 PM
Subject: How to Test an NE75 Neon Lamp
The ready lamp for SINGLE triggering mode in my HP 1421A isn't/wasn't working. ?I'm not sure what the problem is but I have removed the front panel to clean it and before I reinstall it, I'd like to determine whether the lamp is good as it's fairly messy to remove the front panel to get to it.
From what I can tell, there's about 50V across that but not sure if that's when the lamp is supposed to be on or off so I'm not sure if that's enough to turn the lamp on.? I'm not finding much in the way of specs for an NE75 either.
Anyone know how I can test it? Thanks,
Barry - N4BUQ
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