2.5MHz oscillations on scxi-1127 AI channels

[E_Coleman]

I'm trying to measure the circuit below through a SCXI-1127 multiplexer and I'm seeing a 2.5MHZ sinusoid when I connect my circuit output to the multiplexer.  Alone, I don't see this signal, but as soon as I connect to the mux input, it pops up and it is very large.  I can see this signal not only in my software but with an O'scope probe across the circuit's output.  The circuit is a simple Inverting amp and I'm using LT1212 op amp.   I'm also using a virtual ground between the rails since I'm running on battery.  When connected to other DAQ's or Oscilloscope, I get a clean signal, but when connected to SCXI-1127, it shows up - even when the switch isn't on.  Any suggestions or ideas of what the cause might be?

 

[Henrik_Volkers]

Classical event: Amplifier oscillate, while oscillators won't   😄

How much bandwidht do you need?  

A small cap (5-100p) in the feedback loop and a 10R right after the OP output help 

The reason for the oscillation is the higher capacitive load.