I'm currently working on an HP 3312A Function Generator. Same chassis as the 3466 and it has the same push buttons controlling the frequency range as the 3466. The date code on my circuit board is 1984. And the unit was used in an environment where the settings were seldom if ever changed (based on the markings on the front panel). The contacts on almost every single push button are so tarnished that only a few range settings work. So if the manual range settings on the 3466 do not work correctly you probably need to get out the Deoxit.
Thank you for the video with the repair of the instrument. Take good care of the the oscilloscope tip with the extended grounding that is very close to the fuse-holder at 12:45. I like to see many more videos in the future.
The first meter I bought and fixed was one of these, one of the metal can op amps was bad. It was preventing the 7 volt reference rail from coming online, which all the other rails are derived from iirc
Another amazing coincidence! I just pulled an HP3468B DVM off my shelf to fix. It has sat there for probably 10 years and I am now getting around to looking at it. Hopefully my problem will be something easy also??
@@IMSAIGuy I have several variable isolated AC power supplies. They are very helpful in protecting equipment (scope earth connection) and troubleshooting.
@@IMSAIGuy My latest addition is a custom design having a Toroidal Medical isolation transformer 1:1 front end with DUT output controlled by a Variac, max load at 120 VAC of 10 amps. The earth connection is broken. This way you can use a grounded scope for a hot chassis probing if need be. I have a two channel Fluke Scopemeter so I generally use this first to troubleshoot. The two channels are completely isolated from each other and ground (the scopemeter is battery operated). However, if I need more bandwidth or better features I can bring in a better bench scope.
That it has a battery option was not mentioned? (in this vid... it is mentioned at the beginning of part 2) The battery was a lead acid (gel cell type.)... and adds a significant amount of weight...the battery (if it hasn't been recently replaced) is always DOA... and you're paying to ship it.
As I recall... the battery could have been a 'sealed lead-acid" type... though the flooded acid, sealed lead acid, and glass fiber mesh are the current technologies... and I'm not sure where the gel type is the same as the glass fiber mesh technology. I think the first two can vent (to relieve hydrogen pressure build up ... and the fiber mesh does not vent. (It's completely sealed AFAIK.) Venting hydrogen (along with traces of the corrosive electrolyte) doesn't seem like a good idea anymore.
I love how tidy your bench is!
standard state of chaos
Good design means it will failed at the expected circuits. Thumbs up sir and HP.
I'm currently working on an HP 3312A Function Generator. Same chassis as the 3466 and it has the same push buttons controlling the frequency range as the 3466. The date code on my circuit board is 1984. And the unit was used in an environment where the settings were seldom if ever changed (based on the markings on the front panel). The contacts on almost every single push button are so tarnished that only a few range settings work. So if the manual range settings on the 3466 do not work correctly you probably need to get out the Deoxit.
I have that meter. I had problems with the push button switch contacts.
I'm sure you have some interesting stories to tell about your time at HP.
Thank you for the video with the repair of the instrument. Take good care of the the oscilloscope tip with the extended grounding that is very close to the fuse-holder at 12:45. I like to see many more videos in the future.
you are right, that was dodgy...
The first meter I bought and fixed was one of these, one of the metal can op amps was bad. It was preventing the 7 volt reference rail from coming online, which all the other rails are derived from iirc
Another amazing coincidence! I just pulled an HP3468B DVM off my shelf to fix. It has sat there for probably 10 years and I am now getting around to looking at it. Hopefully my problem will be something easy also??
Had no idea you were with HP, hello from KS! Were you in calibration like I am, or were you more on the R&D side of things?
I was in R&D at various divisions and HP Labs
May come up in part 2 but was that 6.3 V point possibly a AC voltage coming off the transformer?
I think it had something to do with the battery option. Once it started to work, I didn't go back to look.
This type of video is my favorite. Can’t wait for part 2 did you EXACT replacement values on the caps?
I just found something close.
When troubleshooting using a scope do you use an isolated AC power supply with no earth connection?
no, hardly ever
@@IMSAIGuy I have several variable isolated AC power supplies. They are very helpful in protecting equipment (scope earth connection) and troubleshooting.
@@windward2818 if you are talking about variacs, they are not isolated. A true isolated supply has a different transformer.
@@IMSAIGuy My latest addition is a custom design having a Toroidal Medical isolation transformer 1:1 front end with DUT output controlled by a Variac, max load at 120 VAC of 10 amps. The earth connection is broken. This way you can use a grounded scope for a hot chassis probing if need be. I have a two channel Fluke Scopemeter so I generally use this first to troubleshoot. The two channels are completely isolated from each other and ground (the scopemeter is battery operated). However, if I need more bandwidth or better features I can bring in a better bench scope.
I have a similar setup. variac followed by a true isolation transformer. use it from time to time.
That it has a battery option was not mentioned? (in this vid... it is mentioned at the beginning of part 2) The battery was a lead acid (gel cell type.)... and adds a significant amount of weight...the battery (if it hasn't been recently replaced) is always DOA... and you're paying to ship it.
As I recall... the battery could have been a 'sealed lead-acid" type... though the flooded acid, sealed lead acid, and glass fiber mesh are the current technologies... and I'm not sure where the gel type is the same as the glass fiber mesh technology. I think the first two can vent (to relieve hydrogen pressure build up ... and the fiber mesh does not vent. (It's completely sealed AFAIK.) Venting hydrogen (along with traces of the corrosive electrolyte) doesn't seem like a good idea anymore.
I have one of those! :)
eta: mine has HPIB, IIRC.
Yes... if anyone wonders... it comes in a plastic case.
Nice video! Who were the four assholes who down-voted this?
Exelent