Author Topic: $5 AD584 voltage references  (Read 3999 times)

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Offline ralphd

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$5 AD584 voltage references
« on: November 11, 2015, 02:45:01 pm »
http://www.aliexpress.com/item/AD584-2-5V-5V-7-5V-10V-High-Precision-Voltage-4-Channel-Reference-Module/32521304265.html

Given the price, I imagine these are AD584Js.  Looking at the datasheet, the 5ppm vs 3ppm/C looks like the only relevant difference.  Noise, drift, line & load regulation are all the same.
http://www.analog.com/media/en/technical-documentation/data-sheets/AD584.pdf

I'm looking for something to test my 6000 count DMM.  The AD584 module voltages are measured with an Agilent 34401 (I've seen the calibration labels posted by some other vendors).  While I doubt the 34401's used to calibrate these modules are calibrated annually (for 35ppm accuracy), even if the reference voltages are accurate to 70ppm that would be fine with me.
Unthinking respect for authority is the greatest enemy of truth. Einstein
 

Online Fungus

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Re: $5 AD584 voltage references
« Reply #1 on: November 11, 2015, 02:55:13 pm »
If you're only going to buy one, it might be a good idea to pay a teeny bit more and get it from a decent supplier.

 

Offline c4757p

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Re: $5 AD584 voltage references
« Reply #2 on: November 11, 2015, 03:06:21 pm »
If you're only going to buy one, it might be a good idea to pay a teeny bit more and get it from a decent supplier.

Yes, this. One from a reputable supplier is only $3 more.
No longer active here - try the IRC channel if you just can't be without me :)
 

Online Fungus

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Re: $5 AD584 voltage references
« Reply #3 on: November 11, 2015, 03:14:56 pm »
If you're only going to buy one, it might be a good idea to pay a teeny bit more and get it from a decent supplier.

Yes, this. One from a reputable supplier is only $3 more.

Or ask AD for a free sample. You never know...
 

Offline bigsky

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Re: $5 AD584 voltage references
« Reply #4 on: November 11, 2015, 03:37:49 pm »
I have one of the Chinese voltage reference modules made with an AD584 in a small Perspex case with Li-ion battery etc. There's been various discussions about them here. The label on it with the voltages says they were measured with a 34401 and I reckon they are accurate as they agree with my various Flukes to within a couple of counts. I'd guess they sell for around US $20 and are very convenient.
 

Offline ralphd

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Re: $5 AD584 voltage references
« Reply #5 on: November 11, 2015, 03:46:41 pm »
If you're only going to buy one, it might be a good idea to pay a teeny bit more and get it from a decent supplier.

Yes, this. One from a reputable supplier is only $3 more.

Who do you recommend (note that I don't do ebay)?
Unthinking respect for authority is the greatest enemy of truth. Einstein
 

Offline c4757p

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Re: $5 AD584 voltage references
« Reply #6 on: November 11, 2015, 03:48:38 pm »
No longer active here - try the IRC channel if you just can't be without me :)
 

Offline ralphd

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Re: $5 AD584 voltage references
« Reply #7 on: November 11, 2015, 04:00:51 pm »
Found a 584K module for ~$6 during the 11/11 sale:
http://www.aliexpress.com/item/AD584kH-4-Channel-2-5V-7-5V-5V-10V-High-Precision-Voltage-Reference-Module/32387122637.html

One of the reviews is from a buyer that tested it against a keithley 2001, and found it accurate to under 1mV.  I think I'll go for this one.
Unthinking respect for authority is the greatest enemy of truth. Einstein
 

Offline krivx

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Re: $5 AD584 voltage references
« Reply #8 on: November 11, 2015, 04:05:50 pm »
Is there any reason you'll use Aliexpress and not eBay? For things like this they are often the same sellers on both sites. I think your odds of getting something counterfeit are about the same
 

Offline ralphd

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Re: $5 AD584 voltage references
« Reply #9 on: November 11, 2015, 04:13:42 pm »
Is there any reason you'll use Aliexpress and not eBay? For things like this they are often the same sellers on both sites. I think your odds of getting something counterfeit are about the same
Many sellers on eBay do paypal only, and after dealing with paypal's horrid customer service, I'll never use it again.
All AliExpress orders are escrow, so the seller doesn't get their money until the order is confirmed received.  While the AliExpress dispute resolution is poor, I use a credit card for all purchases and will do a merchant chargeback if I don't get a refund through AliExpress.
Unthinking respect for authority is the greatest enemy of truth. Einstein
 

Offline eas

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Re: $5 AD584 voltage references
« Reply #10 on: November 11, 2015, 07:10:47 pm »
I have one like this:

http://www.aliexpress.com/item/AD584-High-Precision-Voltage-Reference-Module-4-Channel-2-5v-7-5v-5v-10v/32346545467.html

The provided "cal" values for 2.5, 5, 7.5 and 10v are 9, 8, 27 and 51 counts lower than the values I measure int he 10v range with my HP34011a, which was last calibrated in 2010, according to the sticker on it when I bought it. I'm measuring at 4°C below the temp reported with the provided values. I'm powering the module off a linear supply.

For what it is worth.

DigiKey?

Datasheet spec for initial accuracy is 0.3%, or 30mv at 10v.
 


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