User`s manual

62 •• Data Hiway Testing 2000590-001
How to Test the Data Hiway, Continued
Data Hiway shield lead continuity can be checked by performing the fol-
lowing procedures:
Ground Data Hiway cable shields at only one end of each segment. This
practice reduces ground loop noise.
Step Procedure
1. With Data Hiway communicating with connected Nodes,
temporarily disconnect Channel A shield lead from ground.
2. Connect 10K ohm resistor to disconnected shield and con-
nect battery positive (+) lead to resistor. Resistor should be
in series with the battery. Connect battery negative (-) lead
to unit ground.
3. Connect DVM positive (+) lead to channel A and connect
shield and negative (-) to unit ground. Measured voltage
potential should be 9 Vdc.
4. If 9 Vdc is not measured, the channel A shield line is
grounded at another point; correct problem.
5. Reconnect channel A and shield lead.
6. Repeat steps 1 through 5 for Channel B.
7. Repeat steps 1 through 6 for each shield ground point on
the Data Hiway cable.
Measuring Shield
Continuity