Signal distortion when using NI Scope 5122 with Mux. Switch 2503 2-wire config. to adquire a signal of 16 impulses. Any recomendations?

[jsr]

I'm using a CompactPCI system with a 2503 Relay Mux. used to adquire signals at different points using the NI Scope 5112. One of the signals consist of 16 impulses. But I,m loosing amplitude at the pulses plus some offset with noise at the bottom of the signal.
What consideration I need to have in mind when usng these two devices(NI SOPE 5112 W NI REelay Mux. 2503).
Do I need to add a hardware filter?
Note: another factor is that the signal is not repetitive so it have no period. or frecuency.

[Andy_Hinde]

You need to take into account the characteristic impedance of the relay itself, which in this case is 100 mOhm. 100 mOhm should not cause the behavior you are seeing.
The attenuation is more than likely due to attenuation due to your signal containing frequency components greater than the worst case channel bandwidth of the NI 2503, which is 35 MHz.
All signals, repetitive or not, can be broken down into fundamental frequency components per Fourier's Theorem. If your signal contains frequency components greater than 35 MHz, these components will be attenuated. Try inputting a sine wave to the relay/scope path and gradually increase the frequency. As it goes past 35 MHz, you should see it begin to attenuate. The rising edges of the spikes within your 16 pulses w
ill correspond to high frequency components which may be attenuated.