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Yep, had a Schaffner, filter, fuse, switch combo on an HP 4951C released both magic smoke and tar 10 min after powering up this ebay purchase out of the US, on 240V in the land down under. Don't know

I pulled the diodes up and checked them. There fine. The diodes Alexander suggested are next to impossible to install with normal iron. Hell I barely can see them. My soldering tip is bigger than the

I have had two units with those two caps C15 &16 either puked or nearly so. They seem to be a weakness, but not in all units. It could be that the later 3458As benefitted from better production

Here is the dial on mine. But, I can only adjust to -130dbm, someone suggested a pin has slide out of it's hole preventing the last position. I have yet to explore that. Mikek

I have figured out what is going on. The output attenuator vernier knob, when reduced towards minimum, cause the 0-3 level to light, and the 1-10 light to go off, this drops the output by 10db even

If the 10 db pad were stuck, the output would read +10, +10, -10, -10, -30 etc rather than +20, +10, 0, -10, etc What's the -140 db position? My unit and photos on the web I see only have +20 to -130

I don’t know off-hand how similar the 3457A ones are, but these do fail, and need to be replaced on sight. (And I do hate those rivets — drilling them out is not what I want to do, given the

I haven't replaced the schaffner filter on my two 3458A's. Keysight don't change them automatically if they repair a unit, so I guess they? are not expecting them to fail suddenly. If you do replace

OK, maybe I'm getting it, internally the the 10db attenuator section maybe stuck in circuit. I have no idea of the construction, so didn't know that was possible. Thanks, Mikek

Not exactly sure what you mean, but I have verified that every attenuator setting is 10db low. Using my scope and using another generator.

Yeah, I've had them go bang on other instruments and it makes a mess. You might want to do it at the same time as the electrolytics and also socket and renew the battery-backed sram if it's not

Perhaps the attenuator pad has stuck with 10dB always engaged. Worth some basic investigation with a meter/scope as a first pass. HIH Nigel Sent: 06 September 2022 15:00 To:

I did find a note in the files section that there could be a pin the has slide out of it's hole enough that it can stop the knob from turning to that last -140db position. I'm still 10db low! Thanks,

I've been checking a meter and thought something was wrong with the meter as it read 10db low. I was stepping 10db each time and it was accurate but 10db low. Then I switched generators and then the

I definitely live in 240V land (even more when the PV plant is active). Many schaffner filters died or were found dead when I acquired various test gears. However, I've not replaced them "on sight", I

If you are in the USA, you will probably never witness a Schaffner filter fail. If you are in 220-240V land, you may not be so lucky. When the filters fail, the worst that happens is they release a

Hi Dan, Assuming you download the User Guide from https://www.testunlimited.com/pdf/an/08560-90157.pdf Then we have the same page numbers. On page 149 you can see how to place the analyzer on its side

Yes. The point about Schaffner filters is that X caps of this type (reportedly from WIMA, not RIFA) were use in their line filters up to some point, which (together with the fact that they make a

As far as I know there is not a problem. We've fitted hundreds of assorted types of Schaffner IEC input filters to equipment since the mid 1990s and as far as I know without any failure. I suppose

I have recently acquired a 3458A which incorporates a Schaffner FN9223-3-06 mains filter. The 3458A has a build date of approx 2005 and the Schaffner filter has a date code of 0432. I am wondering if