Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
ocw:
--- Quote ---Missing are the 9.999mA and 99.99mA ranges.
--- End quote ---
Changing to the 0.01 ohm resistor to 0.095 ohms adds the 9.99 mA (yes, 9.999 would be better) and 99.99 mA to the 999.9 mA range while removing the 9.999A range with the decimal point in the correct position when the meter switch is left in the uA position but the AmA jack is used instead.
--- Quote ---Right now, it has 10mR and 100R shunts only.
--- End quote ---
My AN8008 does not have a 100 ohm resistor. It has a 99 ohm resistor in series with a 1 ohm resistor. The 1 ohm resistor is there for use (with some switching).
floobydust:
--- Quote from: plazma on July 24, 2017, 06:42:48 pm ---There is a IC (QFP) footprint under the encapsulant. The die is bonded to the inner end of the pads. So you can carefully remove the encapsulant to reveal the outer end of the pads without harming the bonding wires. I just used hot air to soften the encapsulant and removed it carefully with a surgical knife. The TX pad is the fourth from the top on the left side in your image. Check the DTM0660 datasheet pinout.
--- End quote ---
Ok sounds good, maybe post a pic I have no idea what it looks like under the blob.
Part two to getting serial data output is hitting the RS-232 button. Oh wait we don't have one :palm:
The button matrix is 2x3 mux and "REL/RS-232" button should be PT1.0 pin 42 to EEPROM SDA, both traces are available.
The AN8008 has oddball button assignments in firmware.
plazma:
--- Quote from: floobydust on July 24, 2017, 07:18:19 pm ---
--- Quote from: plazma on July 24, 2017, 06:42:48 pm ---There is a IC (QFP) footprint under the encapsulant. The die is bonded to the inner end of the pads. So you can carefully remove the encapsulant to reveal the outer end of the pads without harming the bonding wires. I just used hot air to soften the encapsulant and removed it carefully with a surgical knife. The TX pad is the fourth from the top on the left side in your image. Check the DTM0660 datasheet pinout.
--- End quote ---
Ok sounds good, maybe post a pic I have no idea what it looks like under the blob.
Part two to getting serial data output is hitting the RS-232 button. Oh wait we don't have one :palm:
The button matrix is 2x3 mux and "REL/RS-232" button should be PT1.0 pin 42 to EEPROM SDA, both traces are available.
The AN8008 has oddball button assignments in firmware.
--- End quote ---
Here is a picture of the AN8002 IC.
floobydust:
Thanks for the pics of what is under there 8) For some reason the LQFP-64 and die versions have different pinouts :-//
I notice the max. counts is programmable with some people changing upper limit 4000, 6000, 9999 counts etc. in the EEPROM for the 8002, 210, 890's etc.
That means you can crank up the A/D counts, although the Vref on 8002 is not super good.
Some guy's Arduino sketch to change EEPROM. I did my own sketch, not pretty enough to post.
tronde:
Why do you think the pinout is different? The Victor VC921 is based on DTM0660 and it is die based. It also has visible pads (they used less epoxy than on the AN8002). The pin numbers matches the data sheet.
The DTM0660 chip is sold as 4000/6000 counts with 9999 for capacitance and frequency. You can increase the counts, but it seems like the AC/DC converter fails above some 7500 counts because of the crest factor. 9999 seems to be OK for DC-only.
I guess the main difference between DTM0660 and the new chip in AN8008 is how they implemented the AC/DC converter. It is believed to be a digital signal processor.
The picture of the VC921 is from kazus.ru
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