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Hi,
Chemist here with only some experience with electronics, trying to find equipment for an experimental setup: I am looking for a data logger or (multimeter with logging function) that can measure on 4-8 channels in parallel. Neither accuracy, precision or resolution are big factors for our application, however, it needs to cover a range of 1 Ω to approximately 250 kΩ.
Sampling rate should be somewhere around min 5 samples/s per channel. A device like this one would be perfectly fine if it was able to measure higher resistance than 10 kΩ: PT-104 Platinum Resistance Temperature Data Logger (picotech.com)
Can anyone help me identifying something that would fit the requirements? Or at least tell me what I should be looking for? I already spent ages looking at all sorts of meters here in the shop, but those with multiple channels seem to be in a different category
Outside of using 4-8 DMM’s with data output, very inconvenient, I don’t know of any off the shelf wide range resistance logger solutions.
The most common solution is to use a voltage logger, a reference voltage source, and a reference resistor wired to form a voltage divider with the resistance under test. The resistance under test is calculated from the logged output of the voltage divider (Voltage divider - Wikipedia). Many voltage logger’s include a built-in reference voltage source to simplify this setup.
Alternatively a voltage logger, and a reference constant current source can be used. The resistance under test is calculated with just ohms law, R=E/I.
As the Pico’s logger has 24-bit precision, you could connect a low drift
10k resistor in parallel with the unknown resistor and then calculate the
unknown resistance value from the measured total resistance.
Thank you very much for the suggestions! I am going to use a Picolog 1216 ( Multichannel Data Acquisition (DAQ) (picotech.com)) which is a voltage logger with a built in 2.5 V source and combine that with a voltage divider as suggested by Paul Hutch.
