Author Topic: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter  (Read 112486 times)

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Offline exe

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #750 on: June 23, 2018, 05:53:50 am »
Can't find 250mA either!

May be there is enough space for a regular fuse?

I think I saw these fuses on AliExpress, although the price was quite high.
 

Offline David Hess

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #751 on: June 23, 2018, 10:21:21 am »
Here is a brute force method that I randomly came across in the LT1011 datasheet.  The LT1011 is an improved 311 but a couple of FET buffers and a better comparator could be used for even greater performance.

 

Offline stj

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #752 on: June 23, 2018, 09:46:20 pm »
the aneng meters can be modded for 20mm fuses.
and you can get ceramic 20mm FF rated fuses - so that's the way to go.
 
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Offline Zimphire

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #753 on: June 28, 2018, 12:30:47 pm »
I've read a good 20 or so pages of this. While it's not the best DMM on the planet, for the price it's perfect for what I need it for. Better than anything in that price range a few years back.

And after doing this mod to it, and getting better probes, it works even better.

https://www.jackenhack.com/aneng-an8008-modify-for-better-accuracy-faster-readings/
 
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Online bitseeker

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #754 on: June 29, 2018, 07:54:10 am »
Welcome to the forum, Zimphire.

Interesting how much noise was in the meter and how much better performance was after Jack made those cap mods.

Looks like he recently fixed up the AN8009 as well. https://www.jackenhack.com/aneng-an8009-improve-accuracy-response/
« Last Edit: June 29, 2018, 08:29:38 am by bitseeker »
You don't acquire TEA. It acquires you.
 
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Offline tooki

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #755 on: June 30, 2018, 05:04:21 am »
Welcome to the forum, Zimphire.

Interesting how much noise was in the meter and how much better performance was after Jack made those cap mods.

Looks like he recently fixed up the AN8009 as well. https://www.jackenhack.com/aneng-an8009-improve-accuracy-response/
Zimph, from MacNN forums, is that you?! :P Blast from the past!!!
 

Offline Zimphire

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #756 on: July 15, 2018, 05:54:04 pm »
Zimph, from MacNN forums, is that you?! :P Blast from the past!!!

Ack! PLZ don't ban me!
 

Offline tooki

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #757 on: July 16, 2018, 12:33:43 am »
Zimph, from MacNN forums, is that you?! :P Blast from the past!!!

Ack! PLZ don't ban me!
Hahaha I’m not an admin here. And you deserved it! ;) Anyway, nice to see a familiar face (well, username!).
 

Offline lordvader88

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #758 on: July 16, 2018, 09:31:49 am »
Wasn't there something very common missing on these like mA ability, just Amps ?
 

Offline floobydust

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #759 on: July 16, 2018, 11:17:24 am »
Wasn't there something very common missing on these like mA ability, just Amps ?

Full featured DMM's using this chipset have a fouth input jack: COM, V, mA/uA, A

AN8008 has three and is missing the low mA range, it has uA, high mA + A. So it reads:

0-99.99uA at the V jack with 100R shunt.
0-999.9uA at the V jack with 100R shunt.
0-999.9mA at the A jack with 0.01R shunt
0-9.999A  at the A jack with 0.01R shunt

Missing is the 9.999mA/99.99mA range with 0.99R shunt.

So you can only get 0.1mA resolution on mA measurements.

Also, it cannot measure past 9.999MEG ohms  :--
 

Offline Fungus

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #760 on: July 16, 2018, 08:36:49 pm »
Wasn't there something very common missing on these like mA ability, just Amps ?

Yes. They don't have a range in the 10mA area. They jump straight from uA to A.
 

Offline exe

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #761 on: July 16, 2018, 08:54:40 pm »
I like having only three jacks -- that's convenient for me. But I'd love to have an audible warning if plug not in the right socket.
 

Offline stj

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #762 on: July 16, 2018, 10:25:33 pm »
I like having only three jacks -- that's convenient for me. But I'd love to have an audible warning if plug not in the right socket.

you do, it makes a bang or large crack sound!  >:D
 
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Offline exe

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #763 on: July 16, 2018, 11:41:39 pm »
you do, it makes a bang or large crack sound!  >:D

Considering the DMM itself costs just a bit more than a good HRC fuse, that's fine with me :). A single-use DMM...

PS could you remind me why it should bang? I thought it has fuses on all ranges...
 

Offline JanJansen

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #764 on: July 17, 2018, 12:30:13 am »
How long does it take before a 99.999 counts meter is to be released for this price ?
My ±100€ lab : old scope, peaktech 6225a, aneng 8008
 

Offline exe

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Re: AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
« Reply #765 on: July 17, 2018, 12:59:49 am »
How long does it take before a 99.999 counts meter is to be released for this price ?

You mean a 5-digit DMM for $15? Well, if you only care about number of digits it's not a problem at all :D. A 16-bit sound DAC with some oversampling will do it... But precision will suffer.
 


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