| Products > Test Equipment |
| AN8008 US $19, 9999count, 1uV, 0.01uA, 0.01Ohm, 1pF resolution meter |
| << < (171/172) > >> |
| floobydust:
--- Quote from: smokeless0864 on January 16, 2024, 02:44:31 pm ---Hi, 2 questions Can we access readings in UART? --- End quote --- No. The UART pins are not bonded out on the die. You can look with a scope for signal but people removed the chip glue and no wire connected inside :( Be careful - Battery(-) is not multimeter input COM(-) and shorting those will blow the IC. --- Quote from: smokeless0864 on January 16, 2024, 02:44:31 pm ---Can it be powered from li-ion battery 10440, ie 3.7v and a dummy cell? --- End quote --- Operating voltage spec is to 3.6V max. So I would add an LDO with 3.6V output to work with 3.7-4.2V input. The LCD contrast might go too dark with higher VCC, it can be changed in EEPROM. |
| chinhnguyen:
Hi. I just bought this DMM, I just added a few decoupling capacitors to it . But I notice a problem: it seems like this DMM can't measure the continuity of the diode right? because current always flows from one direction, but I test the diode with the continuity function and it doesn't work in both directions. if I use the diode function to test its still works. Is that a problem with this dmm or are dmm is the same? |
| wasedadoc:
Continuity mode is for checking if the resistance between two points is a low value. A diode even in forward mode acts like a higher value resistor to the multimeter. If the diode reads ok in diode mode and the meter shows close to zero when the probes are joined in continuity mode there is nothing to worry about. |
| floobydust:
In continuity mode (99.99Ω range), AN8008 test voltage is about 1.0V and test current 0.4mA Diode 0.6V corresponds to around 1k6Ω so nothing is displayed. Below about 49.9Ω has 19mV across it then the beeper activates. So the meter is working normally. |
| Dave Wise:
Apologies if this has been discussed. Is the continuity test fast like the early Fluke handhelds that did it in hardware, or slow and IMO useless? |
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