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

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plazma:

--- Quote from: NivagSwerdna on July 18, 2017, 06:52:56 am ---I'm quite tempted by this meter as my old MasTech doesn't have a uA range but now in two minds due to the lack of low mA ranges.... tricky!

... however I really do need something to measure in the 10uA type area MCU in standby for battery applications.... what to do!  |O

--- End quote ---
Buy both AN8002 and AN8008 :)

alm:
Assuming your current meter has decent mV resolution, you can use an external shunt resistor between the power supply (battery) and micro. A 1 kOhm resistor would give 1 V/mA, or 1 mV/µA, resolution, and should have a low burden voltage at that current.

ebastler:

--- Quote from: NivagSwerdna on July 18, 2017, 06:52:56 am ---I'm quite tempted by this meter as my old MasTech doesn't have a uA range but now in two minds due to the lack of low mA ranges.... tricky!
... however I really do need something to measure in the 10uA type area MCU in standby for battery applications.... what to do!  |O

--- End quote ---

You are hereby officially granted the right to keep your old Mastech meter, and chose between that one and the AN8008 depending on your application.  :P

Having two meters (at least!  ;)) is good anyway, for those situations where you want to monitor two separate voltages, or voltange and current, or...

NivagSwerdna:

--- Quote from: ebastler on July 18, 2017, 07:40:58 am ---You are hereby officially granted the right to keep your old Mastech meter, and chose between that one and the AN8008 depending on your application.  :P
--- End quote ---
:-+
Thanks for the permission. it was enough to get me to click on ebay... £14.95 spent, it should be on the slow boat now.... probably arrive whilst I am away on hols.

Fungus:
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


--- Code: ---/*
 *  DTM0660 Memory Contents and Jumper settings as follows.
00H  -
01H  J1A, J1BDCmV: 60.00mV/600.0mV
02H  J1A, J1BACmV: 60.00mV/600.0mV
03H  X,DCV (without mV): 6.000V/60.00V/600.0V/1000V
04H  X,ACV (without mV): 6.000V/60.00V/600.0V/750V
05H  X,DCVmV (with mV): 600.0mV/6.000V/60.00V/600.0V/1000V
06H  X,ACVmV (with mV): 600.0mV/6.000V/60.00V/600.0V/750V
07H  J1A, J1B,600.0?/6.000k?/60.00k?/600.0k?/6.000M?/60.00M?
08H  --
09H  J1A, J1B,Cont
0AH  J1A, J1B,Diode
0BH  J1A, J1B,Cap: 9.999nF/99.99nF/999.9nF/9.999uF/99.99uF/999.9uF/9.999mF/99.99mF
0CH  J4(or J5),DCuA 600.0uA/6000uA ( DCA 600.0A/6000A)
0DH  J4(or J5),ACuA 60.00uA/600.0uA ( ACA 60.00A/600.0A)
0EH  J3(or J5),DCmA 60.00mA/600.0mA ( DCA 60.00A/600.0A)
0FH  J3(or J5),ACmA 60.00mA/600.0mA ( ACA 60.00A/600.0A)
10H  X(or J5),DCA 6.000A/60.00A ( DCA 6.000A/60.00A)
11H  X(or J5),ACA 6.000A/60.00A ( ACA 6.000A/60.00A)
12H  J1A and J2, J2 Hz/Duty
13H  J1A,Temp (°C)
14H  J6 HFE
15H  J1A,Temp (°F)
16H  J1A,DCA 6.000A
17H  J1A,ACA 6.000A
18H  J1A,DCA 60.00A
19H  J1A,ACA 60.00A
1AH  J1A,DCA 600.0A
1BH  J1A,ACA 600.0A
1CH  J1A,DCA 6000A
1DH  J1A,ACA 6000A
1EH  X,NCV
 */
--- End code ---

If the chipset in the AN8008 is similar then maybe this is the reason it has no intermediate mA ranges - the chipset only supports three ranges and they chose 1A, 1mA, 1uA.

(I can't find the same info for the DM1106EN chipset used in the AN8008 - anyone?)

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