Can I turn off input filtering to sample a high frequency bandlimited signal on a 6259?

[John Navy]

In other words, I want to use the "bandfolding" or "undersampling" technique to sample a signal where nyquist is satisfied for its BW, but it is centered at hundreds of MHz. I tried it using the minimum +/- 0.1V input range but the signal on the computer is just low level noise. So I realized the 6259 probably has some form of input LPF and saw:

Small signal bandwidth (–3 dB)......1.7 MHz

on the spec sheet. So looks like it can't be done, unless there is some way to bypass that?

[ManLongAtNI]

You are correct, the 6259 has a bandwidth limitation on the front end, and there is no way around this. This was designed to filter out any high frequency aliasing, one may see. A scope would be your best option for this type of application. I recommend looking into the SCOPE page for the appropriate hardware. 

[John Navy]

Thanks for the confirmation. Also for the suggestion, I will give it a shot with a scope.