A Discussion and Demo of my HP 3410A Selective Microvoltmeter and measuring low level AC voltages.
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- čas přidán 23. 07. 2024
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In this video:
I chat about the purchase and damage / repair to an HP 3410A Selective Microvoltmeter. I discuss the challenges of measuring really low AC signals / voltages.
This is a prelude to a video about measuring the SNR (signal to noise ratio) of audio equipment. In that video I will demonstrate the capability of the following meters:
* Handheld multimeters
* The Rigol 3068 with a claimed noise floor of 5 uV.
* The HP 3458A
* The HP 3400A
* The B&K (Bruel & Kjaer) Type 2609
* The HP 3410A
* A "secret" German device from the 1980's that will measure down to around -130dBm / -144dBV / ~50-60 nano-volts.
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Music clip from CZcams Music Library - Phase Three by Huma-Huma
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I always love to watch your videos like this one, Martin -- all the way to the end. Your inquisitiveness and enthusiasm for the subjects that interest you are infectious! Looking forward to the next one!
Many thanks!
Don't let the "perfect ones" discourage you! They didn't have their "perfection" when they were born! They had to learn during their life as well.
I am sorry that so many people try to brag about their "knowledge" that isn't helpful! They need to go away.
I enjoy watching your videos, even when you are struggling to get something done as it shows me the struggles that will happen, and I learn from you!
I am envious of your knowledge, research and details that you present!
I enjoy your videos and all the attention to detail and your explanations. I watched the whole thing also!
Very interesting. Thanks for the extended discussion on this subject.
Glad you enjoyed it!
Hi Martin, regarding the shakey hands one soldering tip I was given a long time ago was "get yourself ready to make the joint and then clap your hands together firmly once or twice" this seem to steady your hands for a little while. May or may not work for you but worth a try 🙌
Great demonstration and educational session! Enjoyed watching. Thanks.
Glad you enjoyed it!
That Weston 622 meter is gorgeous! I love those antique instruments for their bakelite cases and leather straps, the old terminals, and all the calibration information that comes with them.
What a jewel you have!
Thanks for your post good man.
I made it all the way through, I love the old hp stuff it was superb, I have a 3406a also
Very interesting. Good job 👏
Thank you! Cheers!
I think the third connection is to ground the metal of the movement, so as to remove any form of static charge or AC noise that might affect the meter movement and cause errors, as this is a very sensitive meter. Shielding the movement will reduce noise fed back to the amplifier, as it has pretty high gain.
You probably can add the ground to the other movement, provided the movement has separate electrically isolated connections to the coils, and no connection to the frame, though typically the frame inside the case is connected to one of the terminals. In the HP 3410 the meter is being driven by a balanced output, so you do need the separate ground for the meter frame, so likely the other movement is usable if there is a separate tiny jumper that handles the one connection to the moving coil, and allows it to be grounded to the frame, so that you can separate the coil in the insulating bearings from the frame.
Thanks Sean, that makes sense.
Sadly, the equipment i walk about with has a terrible noise floor and signal to noise ratio. It makes my enjoyment of music certainly not the same as it used to be.
Tinnitus sucks........
You mentioned loss through the cables -
If that is RG58 or similar, the loss would be immesurable down at audio frequencies. Even up at UHF RF frequencies, we don't routinely account for short patch lead losses at work (two way radio dealer) unless we're doing something a bit special.
In our workshop, everyone has a good old Marconi 2955B test set with a couple of newer digital capable sets to share as required. The old 2955B (mine was made in 1991) generates RF down to 0.04uV!! This is so that we can characterise the recieve sensitivity of the radios we maintain. Most radios will break the squelch at around 0.2uV.
I've always found those numbers utterly mind boggling.
Thanks for your post.
I love vintage, analog, TRMS meters. I have B&K and HP as well, and cherish them.
Thanks for your post.
How much caffiene and sugar?
In general, there never has been a substitute for having HP test equipment on your bench.
Specially the older equipment from the 60's and 70's
nice video...shame 99% of HP power meters dont come with the matching sensor, been after somethin for quite a while...dont think the Chinese have anything similar? i do cb ssb radio stuff....
cheers
Bruel & Kajar. 8:42
Its a danish Æ.. old English language also had these old danish norse letters back in the day... Æ,Ø,Å from when England were part of Denmark.. a huge part of the English language and grammatics are based in old la norse danish wording.
Æ = AE
Ø = OE
Å = AA
So "Kjær" is pronounced "Kjaer"
tons of words that have "ae" in them, is a modern term instead of "æ"..
Hence test devices.."Saelig" measurementgear seller, again is worded from Sælig
Bruel & Kjær are making measurement-gear to this day with turnover in hundreds of millions... they are the worlds biggest player in vibration-measurement gear.
Sound & Vibration high-end test gear that are ludicrisly expensive, sadly.. quite an old company from like the 1930 or 40s..
promosm