You need to give a bit more detail on the problem. First of all are you measuring proximity probe channels off the BNC connectors? Or are you comparing a casing reading with the CSI accel with a BNC reading. The two instruments process accel and velocity signals very differently.

Second, what units are you using? The Bently typically outputs velocity in in/sec 0-pk while the CSI may use RMS.

Third, what scale factor are you using? The old Bently 7200 output velocity at 500 mv/ips, while the new 3500 may be set up for 100 mv/ips.

So as you can see I need much more information to help. Also the machine type and frequency span,in addition to the transducer type would be helpfu.

we are measuring proximity probe channels off the BNC connectors. both readings are direct displacement peak-peak

thank you