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Author Topic: HP 410B  (Read 2605 times)

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Offline neoTopic starter

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HP 410B
« on: July 12, 2017, 11:18:33 pm »
If i have a HP 410B is there anything in it that need to be gone over before turning it on?
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Offline jeroen79

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Re: HP 410B
« Reply #1 on: July 12, 2017, 11:32:25 pm »
Set it to the right mains voltage.

If you have reason to think that something could be wrong you could start with opening it up for a visual inspection.
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Offline neoTopic starter

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Re: HP 410B
« Reply #2 on: July 12, 2017, 11:38:04 pm »
Quote from: jeroen79 on July 12, 2017, 11:32:25 pm
Set it to the right mains voltage.

If you have reason to think that something could be wrong you could start with opening it up for a visual inspection.

I have no suspicions other than the fact it is almost as old as my father, because of that i opened it up to take a look. I just wanted to know if there were any gotchas with it given its age.
« Last Edit: July 12, 2017, 11:45:05 pm by neo »
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Offline alm

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Re: HP 410B
« Reply #3 on: July 12, 2017, 11:46:43 pm »
I would do a visual inspection for loose connections, burned parts or loose screws rolling around. Check the line voltage (actual jumpers if present, I do not trust the label on the back). Plus I check the fuse rating with the manual. That way if there is a short, at least the fuse will provide maximum protection. Sometimes people replace fuses with incorrectly rated ones, all the way up to suitable-sized bolts :P.
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Offline neoTopic starter

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Re: HP 410B
« Reply #4 on: July 13, 2017, 12:27:04 am »
It seems to work but in trying to adjust it the needle is jumping all over the place. Thoughts? Also, once i do get the needle to settle down it does read accurately.
« Last Edit: July 13, 2017, 12:36:03 am by neo »
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Offline Cyberdragon

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Re: HP 410B
« Reply #5 on: July 15, 2017, 09:41:04 pm »
If there are tubes there are most likely nasty old capacitors. Check for excessive ripple (the manual should specify the limit) and change the filter cap if needed.

Clean the switch contacts and check for broken solder joints. Also check and clean any dirty tube pins and sockets. It could also be a bad probe connection, just be careful with the vacuum tube inside the probe.

http://bama.edebris.com/manuals/hp/410b/
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Offline Armadillo

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Re: HP 410B
« Reply #6 on: July 15, 2017, 10:04:53 pm »
Do not connect the ground clip lead or the ac probe body to any part that are not ground potential, it will create a short circuit and "BOOPM"
Treat it like the oscilloscope ground clip.
« Last Edit: July 15, 2017, 10:07:12 pm by Armadillo »
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