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Impedance analyser - audio up to a few MHz

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AndyC_772:
Hi

My trusty HP 4395A recently decided to start misbehaving, and although I'm sure it's a simple fix (display problem), it's getting on for 25 years old now and I shouldn't really be relying on vintage gear that could fail more seriously at any minute.

My main use is measuring the impedance of ultrasonic transducers, in the range from a few kHz up to single digit MHz.

Can anyone please suggest an instrument which might be suitable? Most of the impedance analysers I've found seem to retail for £10k+ and/or struggle to operate at the low frequencies I need.

Thanks in advance:)

mawyatt:
The Hioki IM3536 LCR meter might be considered, we selected this for its range of 4Hz to 8MHz. It's not cheap tho, ~$4.6K.

Another option might be using a modern DSO that has Bode capability, like shown here:

https://www.eevblog.com/forum/testgear/admittance-measurements-with-dso-awg-with-bode-function/msg4491952/#msg4491952

Best,

bdunham7:
I don't know whether this would be adequate for your tasks, but it does operate in the range you need.  I have one but have not used it extensively yet.  If you would like me to run some specific test or measurement to see what the results look like, just ask.  I have the original Analog Discovery, not the 2, but the results should be similar.

https://digilent.com/reference/add-ons/impedance-analyzer/start

https://digilent.com/reference/test-and-measurement/guides/waveforms-impedance-analyzer

https://digilent.com/reference/test-and-measurement/analog-discovery-2/start





zrq:
Assuming you already have good fixtures and calibration standards (and probably some coding skill), the ADMX2001B module may worth considering.

AndyC_772:
Thanks for the suggestions everyone, I really appreciate it.

It does seem like there's a gap in the market here, but then again, I guess there just isn't the volume to drive competition and bring prices down. Clearly it's physically possible to make a suitable device with fairly simple hardware.

In the absence of an affordable direct replacement for the 4395A, I suspect we'd look at buying the Hioki. If it needs some additional software to run a full impedance sweep and plot the results, that sounds like a good project for a student on work experience.

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