J
Jon Danniken
- Jan 1, 1970
- 0
I am using a 100W, 2 ohm power resistor (old wound cement unit) in a circuit
to do some basic measurements with. When cold, the resistor measures 2.1
ohms on both of my DMMs.
After use, when the resistor is hot, I attempted to measure the resistance,
but I ended up with some crazy results, which, depending on which way I
connect the leads, tell me it is either between 3 to 4 ohm, or 0 to 1 ohm.
Since the lead placement affected the reading, I assumed that somehow this
resistor was generating a voltage when hot, but I can detect no voltage with
any of my meters.
What is going on here, and why in the heck is lead placement affecting the
results? Additionally, how can I accurately measure the resistance of this
hot resistor?
Thanks for any insight into this,
Jon
to do some basic measurements with. When cold, the resistor measures 2.1
ohms on both of my DMMs.
After use, when the resistor is hot, I attempted to measure the resistance,
but I ended up with some crazy results, which, depending on which way I
connect the leads, tell me it is either between 3 to 4 ohm, or 0 to 1 ohm.
Since the lead placement affected the reading, I assumed that somehow this
resistor was generating a voltage when hot, but I can detect no voltage with
any of my meters.
What is going on here, and why in the heck is lead placement affecting the
results? Additionally, how can I accurately measure the resistance of this
hot resistor?
Thanks for any insight into this,
Jon