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It seems to me that a 1 THz / sec sweep speed implies coverage of the entire range 100 kHz to 20 GHz with 30 kHz RBW 50 times a second. Is that correct? Can you tell me what the dwell time is on each tune (I’m assuming 160 MHz bw tunes or 125 tunes/sweep)? With no settling time, that seems to imply less than 160 uS dwell per tune. Also, what is the noise floor at that configuration? I hope I’m making sense. Great job on the SM200A and thanks! I’m trying to get enough technical details to get my management to purchase at least one.
Sorry about the question above on dwell time – I had asked about this under a general section back in June 2017 and forgot about it (120 uS / tune dwell time, 20 uS settling time was the answer given then – I assume it’s still correct). I would still like to know what the noise floor would be at 30 kHz RBW with 1 THz / sec sweep speed. I know it will likely increase as you go up in frequency. Thanks again.
Hi Mike,
You are correct about the tuning speed and step size.
You can find the DANL specs here,
https://signalhound.com/download/sm200a-data-sheet/
The RBW will add 10*log10(RBW) dB to the noise floor.
But, sometimes a picture can be instructive.I attached an image of the device configured for the 1THz sweep speed. You can see the device sweeping a 20GHz span in 17.257ms with a 30kHz RBW and a reference level of -20dBm which will configure the receiver for maximum sensitivity. If you increase the reference level the noise floor will come up in 5dB steps.
Let us know if you have additional questions.
Regards,
Andrew
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