Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
stj:
--- Quote from: Fungus on July 18, 2017, 10:13:15 am ---Maybe irrelevant but the DTM0660 chipset (used in the AN8002) only has calibration data for 3 different current ranges.
eg. https://github.com/pingumacpenguin/DTM0660-flasher-arduino-sketch/blob/master/STM32-DTM0660-24c02-Updater.ino
--- End quote ---
dont trust that script, i can see a blatant error in it without even trying.
the endian'nes is backwards on a pair of bytes in the count mod section.
JohnPen:
My AN8008 finally arrived today! I did a few simple tests to see how well it performed. I do not have any precision voltage/current standards or supplies but in comparison with another meter it seemed to be pretty accurate and others have already confirmed these meters accuracy.
The Hz position seems to need typically 100mV input to reach 1.8 Mhz. To reach 9.99 Mhz a 900mV input just made it. I did not want to increase the input level further and find it difficult to see how it could reach the 80Mhz that Mark Hennessy referred to. The lowest frequency I could reach reliably was 1.1 Hz with an 80mV input. Higher input levels didn't affect the latter.
The Hz position Duty cycle seemed OK to approx. 1% although 2% was more stable. I used 200mV input at 150Khz.
The AC Frequency spec. of the V input achieved 1.6 Khz to 10 Hz with a 400mV Sine wave input. With a 10 Volt input the upper frequency dropped back to 1.1Khz. Both True RMS volts readings matched my oscilloscopes RMS readings which is good.
On this V input I noticed that changing the Sel from AC TRMS to the subsidiary Hz setting flashed up the true AC frequency for ~2sec before going to 0.000. I believe Mark Hennessy found this as well and it does seem to be a range change bug as Mark mentioned earlier. I also never saw any Duty cycle % reading. Perhaps others have seen this?
Capacitance measurement is most impressive providing one spaces the leads well apart. I measured 12pfd and 10pfd capacitors easily. Even more amazing it displayed 2 pfd for a 2.2pfd capacitor. (No more digits in display!)
Summing up a very useful little meter especially for electronic use and at the price fantastic. I agree with others that High voltages and Currents are not really suitable for this meter. Also the sockets are rather poorly made and may give some problems in the long term.
kalel:
--- Quote from: cjs on July 18, 2017, 06:12:13 pm ---
--- Quote from: matura713 on July 18, 2017, 02:13:19 pm ---BTW, ADM08A sells for 18-19 USD and it's much solidly build than AN8008....
--- End quote ---
I've got the Peak Meter branded version of that (the PM18C) and it's a pretty nice meter that works well. But I doubt it would appeal at all to the AN8002/8008 audience; it's about four times the size and manual ranging.
--- End quote ---
Personally, I wouldn't mind manual ranging, but then - I haven't had an auto ranging meter yet. Functionality wise, for a 6000 count, it is more expensive than you can get the AN8002 (which is about $13-14 lowest price). None of them have a huge price difference though.
Mark Hennessy:
--- Quote from: JohnPen on July 18, 2017, 06:21:59 pm ---The Hz position seems to need typically 100mV input to reach 1.8 Mhz. To reach 9.99 Mhz a 900mV input just made it. I did not want to increase the input level further and find it difficult to see how it could reach the 80Mhz that Mark Hennessy referred to. The lowest frequency I could reach reliably was 1.1 Hz with an 80mV input. Higher input levels didn't affect the latter.
--- End quote ---
Just to add a bit more detail, I'm using an old HP8656A for this. The highest signal level this produces is +17dBm, which translates to ~1.6V. Pretty sure that's the highest I can easily achieve here, but if we have something else at work that is louder, I'll try it and report back.
I'm not sure what signal level Joe used to get 200MHz from an AN8002 - it's not mentioned in the video. Joe, if you're reading this, can you remember?
Hope that helps,
Mark
stj:
probably 3.3 or 5v
if i was testing frequency, i would be using logic to generate it.
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