I'm sorry for the delay.
1. Do you really mean AC where the current reverses every half cycle or do you simply mean pulsed DC operation?
2. What frequency, low, audio, RF?
1. The current reverses every half cycle.
2. The frequency is 70 Hz
You mean the maximum voltage compliance should be 24 volts, right?
Yes.
The goal:
I must get the every fluctuating resistance value.
The part of data(ohm),
..., 10, 10.7, 15.2, 89, 90.1, 90.4, 125.2, 224, 224.2, 201,...
For a simple on/off a switched constant current generator can do the job (the frequency can be the problem if too high).
Could you explain "the simple on/off switches"?