I am in central Arkansas about 75 miles NNE of Little Rock. Pretty much the middle of nowhere. That's the good part and the bad part.
Color display is a non-issue. I care about the DAQ and repairability.
I just received a 100 pS spike generator from Leo Bodnar. it's a modified version of his 40 pS rise time square wave generator. Absolutely awesome!
It's very close to a minimum phase Gaussian pulse. I don't know what sampling head he is using on his CSA803 (I've asked), but I suspect that it is not an SD30 or SD32 from the appearance of the trailing edge in the plots that came with the unit. If it's an SD24 or SD26 he's banging up against the BW of the sampling head. This thing is *fast*! I now have both the square wave and the impulse versions. If you are trying to test and calibrate scopes, you need a pair. They are an incredible bargain relative to anything else I know of.
In oil industry seismic work, the standard way of testing the AFE and ADC is to input an impulse. Nyquist is typically 250 Hz, so it's very easy to generate a clean impulse. With that recorded on tape before you start acquiring data it's very easy to fix any issues during processing. And spot that it's too broken to use until fixed. Normal processing practice is to zero phase the data which is not physical, but it's a lot easier for the seismic interpreter to pick the time of a symmetric waveform.
