I'm wondering why I can't find an LCR meter with frequency band that starts for example from 1 Hz. Is there some specific reason?
EDIT:
My question comes from the need to measure the impedance of a generic "component". I create a meter with an wave generator and an oscilloscope based on this configuration:
The circuit inside the yellow rectangle is the impedance to measure. The source is my wave generator and the Vout is where I read the output voltage with oscilloscope. Then I compared the SPICE simulation with my measure:
The continue lines are the simulated impedance and the circles are my measures on a similar circuit made by discrete component with same values (resistors and capacitors through-hole). The values of the components are reported in legend.
With this example I want to focus your attention on the fact that this kind of impedance varies at very low frequencies, 0.1-10 Hz. This is the reason why I'm wondering there aren't LCR meter at that band.
Best Answer
They are custom made. For example, this one which works down to 10 µHz (100,000 seconds period, 1.2 days).
But they're not commonly needed, not in electronics. Sometimes in material science measurements. When we had to make measurements of permeability of a special ultra-pure metal we just threw together an experimental rig with lock-in amplifier, power driver and some other instruments we had laying around rather than spending tens of thousands of dollars on a specialized instrument, probably similar to what you are doing. The very low frequency was necessary because of eddy currents. We made vector measurements and extrapolated down to extreme low frequencies.