Products > Test Equipment

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

<< < (137/172) > >>

jackenhack:
Hi!
I was annoyed that the meter took several seconds to stabilize when doing measurements, so I knocked down the noise on the DC rail from 30.8 mV P-P to 3.6 mV P-P. Now the meter stabilizes immediately. Here's the modifications I did. https://www.jackenhack.com/aneng-an8008-modify-for-better-accuracy-faster-readings/. I've seen people mentioning problems with measuring low mA values. I didn't try ampere metering on my meter, only DC before modifying it, but when using an electronic load, I can go step by step in 0.1 mA up from zero without problems. No problems with µA either. How does the problem manifest itself?

floobydust:
Same cap mods I did back in July https://www.eevblog.com/forum/testgear/an8008-us-$19-10000count-1uv-0-01ua-0-01ohm-resolution-meter/msg1261300/#msg1261300

GreyWoolfe:

--- Quote from: jackenhack on October 12, 2017, 04:38:30 pm ---Hi!
I was annoyed that the meter took several seconds to stabilize when doing measurements, so I knocked down the noise on the DC rail from 30.8 mV P-P to 3.6 mV P-P. Now the meter stabilizes immediately. Here's the modifications I did. https://www.jackenhack.com/aneng-an8008-modify-for-better-accuracy-faster-readings/. I've seen people mentioning problems with measuring low mA values. I didn't try ampere metering on my meter, only DC before modifying it, but when using an electronic load, I can go step by step in 0.1 mA up from zero without problems. No problems with µA either. How does the problem manifest itself?

--- End quote ---

I have bookmarked your page.  I have one and am planning on getting another.  I have no smd caps here so it's time for a Mouser order as I need some other stuff also.  It's a shame that the local surplus store only sells SMD passives in full reels.  I don't want that many if they even have the proper values.

stj:
you could use a broken harddrive.
they usually have 10 or 22uf ceramics on them.

JohnPen:
In a fit of enthusiasm I decided to add extra decoupling to my AN8008 3v rail.  Thanks to Jackenhack I decided to progressively add a 1000pfd, a 0.01ufd, a 0.1ufd and finally a 4.7ufd. With each addition I observed the impact on the 3v rail with a scope.  The first 2 capacitors had very little effect but adding the 0.1ufd definitely improved things. Finally adding the 4.7ufd really improved the stability of readings and startup on the volts range was an almost immediate to zero (This was with no probe leads attached as pickup in the leads has an impact on the readings).   I left all the additional capacitors in place as well as the untouched original 100ufd  and the meter is now much more stable than before.  A very  worthwhile modifcation.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod