Products > Test Equipment
AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter
MacMeter:
Sounds like a "deal breaker", at least now you can afford a sandwich!
kripton2035:
Quote from: crazyguy on Yesterday at 19:15:29
Quote from: stj on Yesterday at 18:46:34
any chance of the rest of the schematic?
i'm curious about the star on the resistor and the function of the jumper.
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Here is the translated datasheet into english, with automated software help.
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floobydust:
I got better stability and accuracy after changing the big bypass cap.
I found 3VDC rail has ~30mVpp of noise, low freq. (1kHz) and high freq. from DMM IC charge-pump.
The PCB has places for four 22uF 1206 decoupling capacitors C10, C14, C15, C16 but what's populated is one through-hole 100uF 16V YXA electrolytic that has poor ESR.
Changed to 47uF+two of 22uF X7R 6.3V (total measures 84uF) and 1/3 the noise now. Readings are more consistent and repeatable. Before I always had 2-5 counts variation.
The ICL8069DCZQ 1.2Vref is pretty quiet, C11 0.1uF across it but datasheet gives 4.7uF so you could upsize.
stj:
hardware mods - nice.
i need to check my 8002 board - it uses a YXA, maybe stuff a polymer cap in instead. :)
Naguissa:
Ordered one on ebay from China. Almost 16€, but had a 15€ coupon for a 20€ order so I added a magnetic usb and paid less than 6€.
Let's see when arrives...
Enviado desde mi Jolla mediante Tapatalk
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