Products > Test Equipment

AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter

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rdl:

--- Quote from: bitseeker on August 07, 2017, 02:20:15 am ---
--- Quote from: rdl on August 06, 2017, 01:20:34 pm ---It's been nearly a month since Dave's video and I still can't find anyone selling them that's located in the US. I guess I'll have to buy one from China.

--- End quote ---

Sounds like an opportunity. Buy a boatload at a discount and be the first US reseller. ;D

--- End quote ---

I did consider it, but instead just ordered one from China. Supposedly it has shipped and will be here in two or three weeks.

I've sold quite a bit of stuff on ebay and in general I think it's more trouble than it's worth. I have a large pile of stuff right now I should sell, but I just can't seem to convince myself to make the effort.

bitseeker:

--- Quote from: rdl on August 08, 2017, 12:38:17 pm ---
--- Quote from: bitseeker on August 07, 2017, 02:20:15 am ---
--- Quote from: rdl on August 06, 2017, 01:20:34 pm ---It's been nearly a month since Dave's video and I still can't find anyone selling them that's located in the US. [snip]

--- End quote ---

[snip] Buy a boatload at a discount and be the first US reseller. ;D

--- End quote ---

I did consider it, but instead just ordered one from China. [snip]

I've sold quite a bit of stuff on ebay and in general I think it's more trouble than it's worth. [snip]

--- End quote ---

It is troublesome and I was being facetious, hence the smiley. The margins wouldn't be worth the headache, fees, etc., and domestic shipping cost would blow the deal out of the water. So, everyone still has to buy directly from China.

Fungus:

--- Quote from: rdl on August 08, 2017, 12:38:17 pm ---I have a large pile of stuff right now I should sell, but I just can't seem to convince myself to make the effort.

--- End quote ---

Just take a photo of the pile and post it in the "for sale" section.

Crumble:
I wouldn't bother if the stuff is worth little, usually you'll just wind up having unreliable or picky customers and wasting a ton of time satisfying their needs (or arguing with them about how you won't). I recently tried to sell some perfectly fine stuff (mainly electronics) for low prices, and wound up with customers wanting me to bring it over for free. You may want to add a very explicit comment about what you are and are not prepared to do. Another buyer asked me to send a bench meter over (which I did), but this added more packaging costs and work than I initially expected. In the end I wasted quite some time to get the proper packaging materials and getting the thing arranged, eroding the advantage over just binning stuff. I came to accept I'll have to hand in most stuff I lost a use for to the 2nd hand store for free for it to have a future use.

I got my AN8008 in about 3 weeks from China to The Netherlands, I have no issues with that. When stuff comes over from China it just takes time. Took me $19 from seller qualityzoneonline. It seems to be as accurate as any of yours (but I don't have any reference standards, but it somehow agrees with most other meter I have). I am kind of happy with the functionality of the meter. An extra digit of resolution in the low Ohms is quite useful too for measuring shunts and the likes. Up to now the only meter I had that could do that was a Gossen Metrawatt Metrahit One, which is actually more of an electricians meter than an electronics meter. The Aneng seems to have its track/contact resistances pre-nulled because it actually shows a short as 0.00Ohm. I especially like how it complements the AN8002. Together they can measure almost every common quantity with an appropriate accuracy and resolution.

Gandalf_Sr:
AN8008 CALIBRATION BASICS
I've figured out how to do calibration although I don't have the finer details worked out.  Here's what I know...

1. Short out J1 on the PCB (it's at the top right corner as you look at the PCB from the back of the meter)
2. Get your calibration reference ready and connected - in my case a 300 mA DC feed through the mA/A terminal and Common
3. Turn rotary control from off to the resistance position and CAL will appear on the display
3. Now WAIT until you hear a beep and then move the rotary control to the mA/A position - if you turn the rotary control away from resistance too quickly it doesn't show the values you've selected but moving the rotary switch around corrects that
4. Press [Set/Hold] (orange) button repeatedly until you see DC mA and a value will be displayed
5. Now you should see a value close to what you're providing the meter with, around 300 mA DC in my case
6. Press the [Range] (blue) button (quick press) to range down (but it only does it in 0.1 A increments)
7. Press and hold the [Range] (blue) button (long press) to range up (but it only does it in 0.1 A increments)
8. Press [Set/Hold] (orange) button to move off that setting (I think this is when the cal change just made is saved)
9. Move the rotary switch to off
10. Clear the link on J1 and power back on and test

As far as I can tell, the trick is to set the input to an exact value like 300 mA so you can set that value on the display during cal because you can't adjust the display to 303 mA so, for my slight discrepancy, I saw 298 mA displayed, I ranged down - I saw 200 mA, and then ,with a long press of [Range], ranged up and then I saw 300 mA displayed, pressed the orange button again and I was done.  Other parameters can be set by pressing the [Set/Hold] (orange) button repeatedly but you'll only see values corresponding to the rotary position selected so you'd leave it in the resistance position to cycle through the measurements associated with that position including resistance.

What I'm not clear about is when it actually stores a new calibration value, I guess that, once you use the [Range] (blue) button, it changes the calibration for that setting, and I think it saves it when - having got the display to show the value you want, you press the orange button once more. 

At first I did my above procedure providing 300 mA but ranged down to display 100 mA  and couldn't change that value because I hadn't figured out that a long press ranges up by that point.  So when I then switched off and removed the link, it had calibrated the meter to display 100 mA when 300 mA was supplied which it did.  I had to re-calibrate after I figured out that the long press increases the displayed value.

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