Resistors seem like a simple topic. Just Ohm’s Law:
and a digital volt meter that reads resistor values in Ohms.
But different resistors by size, value, tolerance, temperature compensation, age, and manufacture have a problem with noise. I present several resistor types all with the same value of 100kΩ. Each resistor is tested for stability over time and temperature.
Use this simple procedure to test your own resistors before use in projects that require low noise such as scientific instrument prototypes. I start with 4 minutes of resistance data logging at room temperature followed by an additional 3 minutes of resistance data logging at an elevated temperature using my pinched fingers around the body of the resistor.
|Fluke 125B Resistance Data Log / Part||Increase Temperature during Resistance Data Log / Part Using Heat from Finger|
Test results for 8 different 100KΩ resistors in my lab. Resistors 2), 7), and 8) appear to be the worst after heat applied.
In this last test I verify the stability of my resistance data logging test procedure. Use this information if you would like to repeat this test on your own resistors.
|Baseline Resistance Test||Baseline Resistance Test Results||Test Voltage Used During Resistance Tests||Test Voltage|
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