Hi Jing,
The interference hunting mode is not a real-time measurement, it operates using standard sweeps. This means for short duration events like the ones you are measuring, you can miss them. Increasing the RBW can help improve sweep time.
If all of your events are within a 27MHz span, you can use our real-time measurement mode to be able to visualize all events in the frequency domain, and use our sweep recorder to capture these events. The data format for the sweep recording is different than the recorded data in interference hunting mode, but all events that have 2ms duration will be visible.
You can also record events in zero-span using the I/Q recorder in zero-span mode. You can set up a video trigger and capture a sequence of I/Q time domain files that should contain a significantly higher percentage of the events than you capture in interference hunting mode. Depending on how the pulses arrive, it may not capture 100% of them.
Another option is to use the API in I/Q streaming or real-time mode to capture data and programmatically store the events of interest.
Andrew
