Hi all from Ralph Thomas in Vancouver Canada, enjoyed this video, referred to it several times, at present my project is to put a remote bcd display on my hp 3490a, 5 digit multi meter, using a device like this, to check the calibration, again good video thanks. you all , keep your soldering irons at the right temperatures.
Thank you Martin - another excellent video. Could have used this reference a year ago...would have saved me a bunch of design time rolling my own. The reference drift-over-time performance will be interesting to characterize as this can be difficult to design out... Looking forward to future update videos.
Great videos Ian, I have watched several of your productions and enjoyed them. The overwhelming majority of videos of this kind are garbage, because the presenter spends about 3 seconds preparing for the recording and spend most of the time saying things like "oh that does not work", "Oh I don't know what that is", "Oh I will talk about that later" and on and on and on. The presenters are actually completely ignorant. You obviously know what you are talking about and have a clear plan for presenting the information. I am a Brit who has lived in the USA for 45 years now, but I knew you were a Springbok almost immediately.
it's a really great reference, I have one, thumbs up; easy to calibrate, easy to operate, and has only 10uV noise, way less than expected with a LM399 based design; my only feedback is the power supply, would be great if it used AA batteries or easier access to the batteries
Interesting, I'd like one of these but when I went to his website it shows they are out of stock with a message dating to the 14th while your video was uploaded on the 11th. I don't know if he got publicity elsewhere, but you may have caused a few sales with this video.
For most people (hobbyists) the best solution is something like a ad584 based voltage reference source, should provide an accurate 2.5V, 5V, 7.5V and 10V. Good enough for upto 6000 count multimeters. Would cost about $20 to build one or less than $10 prebuilt on ebay (surprisingly accurate too within 0.1mV in my experience).
+Digger D: The AD588BQ is more precise (+/-1mV on 10V) and has a better 15ppm/1000h long term stability. I am not saying the AD584L is not a good choice (+/-5mV on 10V and 25ppm/1000h).
Javier Palla Lorden You are correct, but for $8 (cdn) this will do nicely. My interest is seeing if my meters (etc.) are generally accurate or drifting over time, so the 584 should be fine for that. Millivolt accuracy will do ;)
Looks like an awesome product. The menu seems really bad in my opinion and draws back the product (but who pays $300+ on this probably won't care much), for example at around 10:30 where you show calibration, it would have been way more user friendly if there were arrows on 2, 4, 6 and 8 and OK on 5 and just scroll to a "Calibrate" menu then go down to "1295" or the entry for 1v and hit left or right to adjust it or scroll down to the end of the list to hit the 5 button on entry titled "Cancel all modifications" The display seems large enough and customizable enough to allow for this. ps. The two 9v batteries would bug me a lot on such a product. The lack of a DC In plug would probably bug me a bit as well, since the reference needs a bit of time to reach temperature it would eat quite a bit from the batteries until it goes "idle". I can understand that switching power supply adapters could introduce noise but the engineer buying such a device could build his own AC adapter from a 12-15v AC transformer, a bridge rectifier and a capacitor, if such a ready made adapter is hard to include in a package.
+mariushmedias - I agree about the menu. Seems a bit 1980-1990 style with labelled function keys at the bottom of the screen. It could also be more intuitive if it had a properly labelled keypad with arrows, etc. LOL... I was just about to mention the 9v batteries but hit the page reload to see new comments and boom you had just edited your comment to including it. Any how, I agree. I don't care for the use of 9v batteries with their low power density, cost and can be harder to find compared to AA batteries. But with two 9v in series it looks like it needs a pretty high voltage so trying to fit 10x AA in there would be tough. Going to a rechargeable LiPo might have been better while also preventing the requirement of using a DC to DC converter that could/would introduce noise. Using this in some kind of production environment would require opening it every other day which quickly gets tiring. Interesting product though.
+mariushmedias Ian has released a firmware update which does improve the UI a little, and does listen to feedback. This will never be a general purpose device, the individual calibration and settling times needed for accuracy preclude it. It is possible though to get it and put in the larger capacity power supply, but at the expense of having a higher noise output with a mains only supply. Would be nice to have a 5S lithium pack with built in charge controller to power it though, using a laptop charger brick to recharge when low, so the unit will float on battery when in use. You could always design an add on board that does that, and as the built in micro has spare capacity and io pins for the I2C interface to read the charge data this would be a nice addition to the unit.
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Racal-Dana used two LM399s in their 5000 series bench meters. I have a 5004 myself, and it still works wonderful today.
Hi all from Ralph Thomas in Vancouver Canada, enjoyed this video, referred to it several times, at present my project is to put a remote bcd display on my hp 3490a, 5 digit multi meter, using a device like this, to check the calibration, again good video thanks. you all , keep your soldering irons at the right temperatures.
Thank you Martin - another excellent video. Could have used this reference a year ago...would have saved me a bunch of design time rolling my own. The reference drift-over-time performance will be interesting to characterize as this can be difficult to design out... Looking forward to future update videos.
Great videos Ian, I have watched several of your productions and enjoyed them. The overwhelming majority of videos of this kind are garbage, because the presenter spends about 3 seconds preparing for the recording and spend most of the time saying things like "oh that does not work", "Oh I don't know what that is", "Oh I will talk about that later" and on and on and on. The presenters are actually completely ignorant.
You obviously know what you are talking about and have a clear plan for presenting the information.
I am a Brit who has lived in the USA for 45 years now, but I knew you were a Springbok almost immediately.
Finally Martin get 3458A in use :).
it's a really great reference, I have one, thumbs up; easy to calibrate, easy to operate, and has only 10uV noise, way less than expected with a LM399 based design; my only feedback is the power supply, would be great if it used AA batteries or easier access to the batteries
Indeed a very good voltage reference, Ian really knows what he's doing.
Did you ever check this device down the track for drift?
2021... still looking for v ac and mv ac type item.....
Nice meter! Thanks for the review Martin.
Rob
Hats off to you brother.
I love this product! Thanks Martin! Really accurate review!!
Hello. Where to buy Banana cable. Thanks
I am a complete noob, could someone explain to me in which situations you would need a really precise voltage?
Thanks in advance
Calibration of test equipment
Interesting, I'd like one of these but when I went to his website it shows they are out of stock with a message dating to the 14th while your video was uploaded on the 11th.
I don't know if he got publicity elsewhere, but you may have caused a few sales with this video.
Really good stuff @IanScottJohnston . Wish I had the money to purchase one (hopefully soon), watched all the videos you making it :D
+leppie IAN Y U NO TAGGABLE??? :D
Hi Martin, how are things my friend? Have you ever looked at that Stan Meyer rebuild by Max Miller (Irondmax) pretty interesting.
Great review of a great product! :)
Neat small standard. I like it :) So now for 300 Eur You can calibrate Your handheld dvm-s.m
And the thermo sensors, op-amps, photo resistors, jfet-s, vca-s, whatever. Nice nice nice
For most people (hobbyists) the best solution is something like a ad584 based voltage reference source, should provide an accurate 2.5V, 5V, 7.5V and 10V. Good enough for upto 6000 count multimeters. Would cost about $20 to build one or less than $10 prebuilt on ebay (surprisingly accurate too within 0.1mV in my experience).
Time to give it away!!!
Thanks Martin.
Can you recommend a much cheaper one without any bells and whistles?
a fixed one, check dmmcheck, an adjustable portable one, there just isn't one
Cheers! Loved it.
And Brymen 869 ?
Great video!
You must try it in thermalbox
starting at about 7:20 who else tried to wipe monitor screen clean?
top equipament!
👍👍
Now show me one that cost $5 ;) It would be nice if you could do a video on DIY voltage standards.
Go and buy yourselve an AD588BQ on ebay.
Javier Palla Lorden Choose the AD584L instead - $8 Cdn for reference board. Suits my purposes.
+Digger D lots of cheap chinese ones on ebay. look for ad584.
+Digger D: The AD588BQ is more precise (+/-1mV on 10V) and has a better 15ppm/1000h long term stability.
I am not saying the AD584L is not a good choice (+/-5mV on 10V and 25ppm/1000h).
Javier Palla Lorden You are correct, but for $8 (cdn) this will do nicely. My interest is seeing if my meters (etc.) are generally accurate or drifting over time, so the 584 should be fine for that. Millivolt accuracy will do ;)
I translate with a switch, you translate with....
Looks like an awesome product.
The menu seems really bad in my opinion and draws back the product (but who pays $300+ on this probably won't care much), for example at around 10:30 where you show calibration, it would have been way more user friendly if there were arrows on 2, 4, 6 and 8 and OK on 5 and just scroll to a "Calibrate" menu then go down to "1295" or the entry for 1v and hit left or right to adjust it or scroll down to the end of the list to hit the 5 button on entry titled "Cancel all modifications"
The display seems large enough and customizable enough to allow for this.
ps. The two 9v batteries would bug me a lot on such a product. The lack of a DC In plug would probably bug me a bit as well, since the reference needs a bit of time to reach temperature it would eat quite a bit from the batteries until it goes "idle". I can understand that switching power supply adapters could introduce noise but the engineer buying such a device could build his own AC adapter from a 12-15v AC transformer, a bridge rectifier and a capacitor, if such a ready made adapter is hard to include in a package.
+mariushmedias - I agree about the menu. Seems a bit 1980-1990 style with labelled function keys at the bottom of the screen. It could also be more intuitive if it had a properly labelled keypad with arrows, etc.
LOL... I was just about to mention the 9v batteries but hit the page reload to see new comments and boom you had just edited your comment to including it. Any how, I agree. I don't care for the use of 9v batteries with their low power density, cost and can be harder to find compared to AA batteries. But with two 9v in series it looks like it needs a pretty high voltage so trying to fit 10x AA in there would be tough. Going to a rechargeable LiPo might have been better while also preventing the requirement of using a DC to DC converter that could/would introduce noise. Using this in some kind of production environment would require opening it every other day which quickly gets tiring. Interesting product though.
+mariushmedias Ian has released a firmware update which does improve the UI a little, and does listen to feedback. This will never be a general purpose device, the individual calibration and settling times needed for accuracy preclude it.
It is possible though to get it and put in the larger capacity power supply, but at the expense of having a higher noise output with a mains only supply. Would be nice to have a 5S lithium pack with built in charge controller to power it though, using a laptop charger brick to recharge when low, so the unit will float on battery when in use. You could always design an add on board that does that, and as the built in micro has spare capacity and io pins for the I2C interface to read the charge data this would be a nice addition to the unit.
What kind of bonehead clicks on the dislike button?
+Ron Shaw The makers of that crap one he was talking about ;)
I wonder if it is crap tho. It's a lot worse than the one he was reviewing, but also substantially cheaper
Whats the name of that cheap scam voltage source?
Kind of a terrible user interface.