Measurement-computing CIO-DAS16/M1/16 Manuel d'utilisateur télécharger pdf (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.

Signal High

Signal Low

hannel # High

hannel # Low

Shielded Cable

IO-DAS16/M1/16

LGND

WRONG WAY! - This is the wrong way to connect cable shield.

Ground Loop Created Here

Instrument

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Measurement-computing CIO-DAS16/M1/16 Manuel d'utilisateur Page 9