Hello thientran,
The API you are currently using has been deprecated and we unfortunately don’t support it anymore. Several years ago we released a newer API for the SA44B which you can download in our SDK at the link below.
Using the newer API, I would configure a sweep and use the sweep data to measure the amplitude at a given frequency. You can use the Spike software to determine the sweep settings needed for your measurement and use them when setting up your sweep in the API. There is a sweep example you can use to get you started.
There is no measurement receiver function in the new API, but based on your short description, it does not sound like you need that. It sounds like a simple sweep would work.
https://productbundlesdemo.kinsta.cloud/software/signal-hound-software-development-kit-sdk/
Let me know if you have follow up questions.
Regards,
Andrew
