When you want to purchase a DMM, more probably you don't see at what frequency the DMM you considered would work, but in the situation you're considering to purchase an LCR meter, manufacturers give you big details on the frequency of the LCR meter.
- Why do they give us the details on the frequency of their LCR meter?
- It seems that they gives us the measurement frequency for all of three components. Resistors, inductors, and capacitors. Okay, but how the best frequency be chosen for each one of these components?
Here is several links to some LCR manufacturers:
Best Answer
They give you the details, because for real-world components there isn't one concrete value; they are all dependent on the operating frequency to a greater or lesser extent.
The best frequency will depend on your application. Ideally it would be the same as your target operating frequency.
For example, if you are measuring an SMPS inductor then a high frequency will be more useful (as your circuit operating frequency is likely to be high), an electrolytic capacitor would be best measured at a lower frequency (as they don't have, and you wouldn't design expecting them to have, good high-frequency performance) and a line-frequency choke would be best measured even lower.