Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
floobydust:
My meter came in from AliExpress ANENG store. Price has gone up since I ordered it now USD $24.18 and supposedly 29% off the regular $USD 34.
Took it apart and did the usual ritual IPA + Q-tip clean of flux, slag, solder balls. I resoldered the fuse clips, they had no solder on the top layer. Overall the build quality is good and seems a new level for china. Next I'll run it.
Replacement fuses in North America... I have 10A for current and 200mA for input.
Littelfuse 3.6x10mm fuses and Bussmann/Eaton, Schurter SPT 3.67x10; This size is 250VAC interrupt-rated...
But all have pigtails :(
So either never blow the fuse, or I'll try the 20mm mod. instead of waiting for fuses from china.
deflicted:
--- Quote from: Fungus on July 14, 2017, 09:21:54 pm ---
--- Quote from: deflicted on July 14, 2017, 06:32:05 pm ---
--- Quote from: MasterTech on July 14, 2017, 06:15:37 pm ---Well, after watching Daves video I just.... bought another one :popcorn:
--- End quote ---
I'd be interested to see how well they compare. With everyone buying these and putting them through various tests, it's still somewhat of an open question whether the results are repeatable from one unit to the next.
--- End quote ---
Are you saying Dave just got lucky? On all ranges?
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Not at all. I'm saying maybe Dave just got a generally high quality unit. You wouldn't expect that a meter that's dead on at 5V would be WAY off at 5mV, although I suppose it's possible. But with such a cheap meter, I wouldn't be at all surprised if there's some significant variation in quality from one unit to the next. Maybe he gets one AN8008 that measures 5.000V with his voltage reference set to 5V, but then he orders a second AN8008 and it reads 4.986V. Would that really surprise you for a $19 meter? Even Fluke, Agilent, etc, don't have perfect production processes, QC, etc. So maybe one out of every 10,000 Fluke units is not up to snuff, or something like that. What's your guess as to what Aneng's percentage is? That's all I was getting at. A sample size greater than N=1 (using the same set of references, verified with the same high quality bench meter, etc) would be interesting to see.
Edit: Given that one horribly bad solder joint that Dave showed in the video, I don't see why one would expect consistent high quality on every AN8008 unit.
sleemanj:
--- Quote from: floobydust on July 14, 2017, 10:32:28 pm ---But all have pigtails :(
So either never blow the fuse, or I'll try the 20mm mod. instead of waiting for fuses from china.
--- End quote ---
I bought replacements from RS with pigtails, flushcutters fixed that.
Mark Hennessy:
--- Quote from: stj on July 14, 2017, 07:03:28 pm ---
--- Quote from: Mark Hennessy on July 14, 2017, 05:13:17 pm ---Does anyone know anything about the internal switch? On the AN8002, it's range.
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it was tried in a utube review, it is fully funtional manual range override.
more interesting question is why it's there - is it used in the calibration process??
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Yes, it's a range button on the AN8002 - as I say. I tried it myself months ago.
However, what about the AN8008? Nothing happens when you short it. It's also connected to one of the test pads (PT1.1, which is the same in the AN8002) - so yes, perhaps it is part of the calibration procedure? Looking at the DTM0660 data sheet, you need 3 keys to operate the calibration procedure, and I guess it seems likely that the IC is in the AN8008 works in a similar way...
The datasheet states that "PT1.1" is pin 23 of the IC, which is described as "Data input/output, SPI communication port (SCE), OTP read/write port (PSDI), interrupt source (INITI)".
fish2eggs:
Greetings all,
has anybody tested the burden voltage on the low current ranges?
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