Need uAmp measurement at 200kHz

[Wimberleytech]

I need something like the uCurrent Gold for a project.  Need to resolve 1uA at a minimum at 100-200kHz ish, measured/monitored with a scope.

This is low-side sensing also.

No place I have found in US to get the uCG...sure I could build it but I am in a hurry.  I found Cmicrotek but $700 is more than I want to pay if I can avoid it.

Any suggestions?

[Gyro]

If it's low-side sensing, and hopefully not mains related, then why not simply measure the voltage drop across a shunt resistor with a scope.

You haven't indicated what burden voltage you can tolerate, or the magnitude of current that you want 1uA resolution on.

[Wimberleytech]

If it's low-side sensing, and hopefully not mains related, then why not simply measure the voltage drop across a shunt resistor with a scope.

You haven't indicated what burden voltage you can tolerate, or the magnitude of current that you want 1uA resolution on.

Using a series resistor is my backup plan (in series with the output collector of an opto and a smps chip), but am willing/wanting to shell out some cash to get a more elegant solution.

[pigrew]

My solution (at 500 kHz) was to use a current transformer (Coilcraft) with a high-resolution oscilloscope. In my case, we only were interested in CW, and were able to characterize our transformer/oscilloscope at a small set of frequencies. It seemed stable enough versus temperature. I was sure to keep the oscilloscope in a fixed range.