Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
joeqsmith:
--- Quote from: Gandalf_Sr on August 09, 2017, 12:09:38 pm ---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.
--- End quote ---
After I posted a video where I had modified the KZ102 (AN8002) to the capacitance readings were off about 100pF. Someone had wrote me about modifying the contents of the PROM to realign it. Seems like a lot of work. Does anyone know if the above procedure applies to the AN8002 (and others) as well? For capacitance and current, what are the standard values that are required?
IanB:
--- Quote from: Gandalf_Sr on September 04, 2017, 08:41:23 am ---My annoyance was that, as an Amazon Prime customer, where shipping is free, I'm used to seeing an item listed as 'Prime', clicking on it, and having it a less than a week later. The Prime price may be a couple of dollars more but with free shipping that is often the better deal. When I went on Amazon to buy the AN8008, I clicked on a Prime vendor for about $23 and then waited a month to get it. I could have paid less to order it from Banggood (or an eBay seller in China), and got it in 2 weeks.
I don't mind buying from China but I do mind buying from Amazon, probably paying a few dollars more, and then finding that the item was shipped from China and took a month to get here.
--- End quote ---
Prime is irrelevant. Please tell whether the item was listed as "In stock and sold by Amazon" or "Sold by X and fulfilled by Amazon"?
If either of those were stated and the item was not promptly packed and shipped from an Amazon warehouse you have a complaint against Amazon for false listing information.
stj:
--- Quote from: joeqsmith on September 04, 2017, 02:09:24 pm ---After I posted a video where I had modified the KZ102 (AN8002) to the capacitance readings were off about 100pF. Someone had wrote me about modifying the contents of the PROM to realign it. Seems like a lot of work. Does anyone know if the above procedure applies to the AN8002 (and others) as well? For capacitance and current, what are the standard values that are required?
--- End quote ---
i imagine it's the same, the newer chip is evolved from the DM0660
great video btw, after watching your mods i had to open mine again.
not for electronics, i never thought to grease the switch detents the first time - very nice positive action now i put some lithium grease in it! :-+
ModemHead:
This "Ragu 17B+" was very recently brought to my attention. $10 at Amazon, with Prime 2-day shipping available.
I do not have one. But by looks alone, I'm guessing this is another DMT0660-based meter somewhat like the AN860B+, trading the temperature function for non-contact voltage.
Sure is cheap! Not sure how long the sale price will last.
kalel:
--- Quote from: ModemHead on September 04, 2017, 05:52:18 pm ---This "Ragu 17B+" was very recently brought to my attention. $10 at Amazon, with Prime 2-day shipping available.
I do not have one. But by looks alone, I'm guessing this is another DMT0660-based meter somewhat like the AN860B+, trading the temperature function for non-contact voltage.
Sure is cheap! Not sure how long the sale price will last.
--- End quote ---
Looks good. Might get to $20 or so.
Couldn't find it on eBay except from 2 US sellers, $14 and 26 without shipping.
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