Measurement Computing CIO-DAS16/M1/16 - Manual (Page 9)

3.3.5 AVOID GROUND LOOPS
Figure 3-4 shows the wrong way to connect a shielded cable. It creates a ground loop. Any current flowing between
grounds can interfere with your readings.
Figure 3-4. The Wrong Way to Connect a Shielded Cable
3.4 DIGITAL OUTPUTS & INPUTS
All the digital outputs and inputs on main I/O connector are TTL level. The binary logic inside the PC is all TTL or
LSTTL (Low power Schotky TTL).
If you desire to control or sense any device other than TTL IC chips, please use appropriate signal conditioning, such
as solid state relays or electromechanical relays. See the Measurement Computing catalog for SSR-RACK24 and
CIO-ERB24 interface accessories.
5
Signal High
Signal Low
Channel # High
Channel # Low
Shielded Cable
CIO-DAS16/M1/16
LLGND
WRONG WAY! - This is the wrong way to connect cable shield.
Ground Loop Created Here
Instrument