Hi,
Sorry for my poor english.
I have one Oscilloscope MSO9404A 4 GHz, 20 GSa/s. Very often I do not need all the bandwidth (4 GHz) of the oscilloscope to effetture measures, but much less. To decrease the noise, I use the "Bandwidth Limit" but it's is very very slow. For 50 MHz, 100MHz, 200Mhz, 500MHz it is unusable, the filtering is done in software and it's very slow.
In recent firmware (Ex: 3.50.0003) provides a hardware limitation of the band. Using this mode, the slowdown is not present but there is only a limitation to 20 MHz. Agilent can not implement even 50 MHz, 100 MHz, 200 MHz, 500 MHz ?
!http://img689.imageshack.us/img689/6908/channelbandlimit.png!
Thanks very much.
secureasm
Sorry for my poor english.
I have one Oscilloscope MSO9404A 4 GHz, 20 GSa/s. Very often I do not need all the bandwidth (4 GHz) of the oscilloscope to effetture measures, but much less. To decrease the noise, I use the "Bandwidth Limit" but it's is very very slow. For 50 MHz, 100MHz, 200Mhz, 500MHz it is unusable, the filtering is done in software and it's very slow.
In recent firmware (Ex: 3.50.0003) provides a hardware limitation of the band. Using this mode, the slowdown is not present but there is only a limitation to 20 MHz. Agilent can not implement even 50 MHz, 100 MHz, 200 MHz, 500 MHz ?
!http://img689.imageshack.us/img689/6908/channelbandlimit.png!
Thanks very much.
secureasm
The processing time necessary to do a SW filter is a function of the ratio between the sample rate and the requested BW. The lower the BW, the more taps required, and the longer the processing time. Lower sample rate - fewer taps.
Here's my recommendation:
- Use a Low-Pass filter function rather than InfiniiSim. You'll have a lot more control over the filter parameters.
- Reduce the sample rate when you're filtering. If you want a 100MHz filter, for example, reduce the sample rate to 1GHz or maybe even 500MHz. That will reduce the filter processing time by a factor of at least 20.
Let me know how you make out.
Al