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Hello,
I’m trying to make some simple analysis of quartz resonator response (30MHz for example). I know for sure, the tracking generator can output frequency with 10Hz step around the desired frequency, but scalar analysis can’t make steps less than 1KHz.
Compare 2 pictures, one with scalar analysis (I request 500points in 50KHz range, instead I get only 50points), second with the same tracking gen doing sweep with external software.
The resolution is much better in second variant, so I see the hardware can do much better resolution, but Spike have some strange limitation.
May be in 2.2-4.4GHz range the TG44 can have 1KHz resolution and the limitation is correct there, but in lower ranges the scalar analysis can be significantly improved.
Regards, Ivan
Hi Ivan,
There are some hardware/software limitations that limit the step size to 1kHz with the TG/BB combo. I apologize for the inconvenience.
Regards,
A.J.Ivan,
High Q devices require a long settling time, often tens of milliseconds, before an accurate measurement can be taken. This is one reason we limit the step to 1 kHz–any finer resolution would take exponentially longer to measure.
In Spike, you can accomplish a high Q insertion loss measurement using a MAX HOLD trace and the TG CW utility, manually stepping across the frequencies of interest. Your “external” sweep with max hold is a good approach to this, and essentially automates this process.
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