Hi,
I have build 32 constant current sources controlled by a DAC. Each source can provide upto +/- 1mA peak to peak with +/- 15volts compliance voltage. The sources had some DC current leakage problem which I solved using 6H inductors at the output of each source. The output becomes dependent on frequency and reactance. I could not go back and try to null the offset voltage thats why I had to use inductors. The load impedance is between 1 to 10kohm. I need to know that how much AC current is flowing through the load and how much current is flowing through the inductor practically at 10kHz. The inductor impedance at 10kHz is 370 kohm. What method should I use to measure the current? I looked into the oscilloscope current probes and they do not do that low current mesurement. I used the multimeter but it did not show me anything else except zero.. plus how can measure the reactance of the inductor at 10KHz?
Please advice!
John