Products > Test Equipment

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

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sleemanj:

--- 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 ---

See the PM18A I noted in the 8001 thread, appears to be a new meter, auto ranging version of the 18C

https://www.aliexpress.com/item/PEAKMETER-Multimeter-Voltmeter-Ammeter-PM18A-with-True-RMS-AC-DC-Voltage-Resistance-Capacitance-Frequency-Temperature-NCV/32817940143.html

crazyguy:

--- Quote from: free_electron on July 18, 2017, 03:21:39 pm ---
--- Quote from: ocw on July 17, 2017, 11:56:41 pm ---I modified my AN8008 to provide single digit mA readings with 3 digit resolution.  I replaced the regular mA/A readings with the ability to measure currents below 100 mA with a XX.XX mA display.  Currents below 1A are measured with the same XXX.X mA display.  1A is now the maximum current which can be measured.

I replaced the 0.01 ohm shunt resistor for the A/mA jack with a 0.10 ohm 0.5% resistor which I had in stock.  Attached is a picture of the upgraded meter measuring 2.5000 mA current.  On the left the meter is in the uA position, the test lead is in the A/mA jack and the meter reads 2.59 (uA) [3.6% high].  On the right I've switched to the mA position but the reading has gone down to 21.9 (mA) [12.4% low].  I obviously haven't corrected the position of the decimal.  Remember, the actual current through the meter is 2.5 mA is both cases.

About a 0.12 ohm resistor will correct the magnitude of the of the reading when the meter's switch is in the mA position.  But, I prefer having the decimal point in the correct position.  Being in the A/mA jack will remind me that mA is the actual display units.  I might purchase some 0.10 ohm resistors with less precision hoping to get one a bit low in value which will improve the mA reading's accuracy when the meter's switch is in the uA position.

--- End quote ---

how about calibrating it instead ? the eeprom holds calibration data. These machines do not bank on the precision of the resistors. they apply mathematical compensation.

--- End quote ---

according to HoldPeak HP890CN calibration procedures :

short the calibration jumper, enter the calibration mode, connect the probes to the specified reference DC/AC voltage/current/resistor... press the SELECT [function]/HOLD [-]/Other buttons [+]  ...  repeat for other ranges ... restore the jumper to it's normal position (eeprom write protected position).

crazyguy:

--- Quote from: matura713 on July 18, 2017, 02:13:19 pm ---again, the common opinion is DTM0600 and DM1106EN are cheap clones of Hycon HY12P66, that's why there are so cheap DMMs with them compared to the one that has original Hycon HY12P66 inside.

--- End quote ---

I don't think DTM0660L/DM1106EN are clones. You can see from the DTM0660L photo



there are two logos on the chip, DreamTech / HyconTek.





Dream Tech International Ltd is just a trading company import the chips from Taiwan, and export the chips to the manufacturers in China. They do not produce any semiconductors.

HyconTek is just provided a DMM solution to the customers. You can order your customized chips from them.

Dream Tech International Ltd
http://www.dreamtechintl.com.cn/en/about/about-108.html

JohnPen:
With regard to the Hz input level and Mark's comment about using up to ~ 1.7 volt input. I became a bit more courageous and upped the level to a 4 volt sine wave and managed to get to 19 Mhz.  A 4 volt Square wave gave a similar result.  I am definitely stopping at this level as I don't wish to possibly kill the meter or at least the Hz function.  It is not a function I expect to use but you never know it may be useful at some time in the future.

Edit:  I checked my signal generator it was not a 4 volts level but a 3.7 pp Sine and the Square was also a Sine!  Just goes to prove one cannot believe the output levels on a cheap signal generator and one should always double check with a more professional instrument!

matura713:

--- Quote from: cjs on July 19, 2017, 02:28:40 am ---
My PM-18C has different holes in the amps ranges; instead of 100?A/1000?A/1000mA/10A (.01/.1/1000/100k ?A resolution) it's got 60?A/60mA/600mA/20A (i.e. .01/10/100/1000k ?A resolution).

--- End quote ---

i don't think that's an issue (as far as not some external components to DM1106EN are crucial for the resolution), because what to measure on what position depends on the EEPROM settings - the same how C/F temperature measurement are added to mV position on AN8008. basically, you should be able to re-arrange what position measures what just with changing bytes in the EEPROM.


--- Quote from: sleemanj on July 19, 2017, 03:06:01 am ---
--- 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 ---

See the PM18A I noted in the 8001 thread, appears to be a new meter, auto ranging version of the 18C

https://www.aliexpress.com/item/PEAKMETER-Multimeter-Voltmeter-Ammeter-PM18A-with-True-RMS-AC-DC-Voltage-Resistance-Capacitance-Frequency-Temperature-NCV/32817940143.html

--- End quote ---

that's interesting, but there are no any photos of PM18A inside, that I can find - is it DM1106EN or not?


--- Quote from: crazyguy on July 19, 2017, 04:51:44 am ---
--- Quote from: matura713 on July 18, 2017, 02:13:19 pm ---again, the common opinion is DTM0600 and DM1106EN are cheap clones of Hycon HY12P66, that's why there are so cheap DMMs with them compared to the one that has original Hycon HY12P66 inside.

--- End quote ---

I don't think DTM0660L/DM1106EN are clones. You can see from the DTM0660L photo

there are two logos on the chip, DreamTech / HyconTek.


Dream Tech International Ltd is just a trading company import the chips from Taiwan, and export the chips to the manufacturers in China. They do not produce any semiconductors.

HyconTek is just provided a DMM solution to the customers. You can order your customized chips from them.

Dream Tech International Ltd
http://www.dreamtechintl.com.cn/en/about/about-108.html

--- End quote ---

interesting observation, you seems to be correct! I just doubt anyone else until now noticed that!!

[EDIT] HyconTek posted all kinds of information and tools on their website:

www.hycontek.com/en/products-en/3256

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