Figure 5-11: Help text example
DC voltage measurement Possible cause Action
Lower than expected The power supply's voltage
setting may be set too low.
Verify the power supply's
voltage setting is correct. If
necessary, increase the power
supply voltage.
An unexpected voltage drop
may be due to a damaged cable,
corrosion in the terminals, low
impedance to ground, water in
the device terminals, or loose
connections.
Measure the voltage at several
points on the fieldbus segment
to determine the location of the
unexpected voltage drop. Start
at the power supply and
continue toward the original
measurement point where the
voltage was measured low.
Higher than expected There may be more than one
voltage source on the fieldbus
segment.
Ensure there is only one voltage
source.
The power supply's voltage
setting may be set too high.
Verify the power supply's
voltage setting is correct. If
necessary, decrease the power
supply voltage.
Low-Frequency noise Possible cause Action
Higher than expected When the AC adapter is
attached to the Trex unit, it can
appear as low-frequency noise.
Disconnect the AC adapter from
the Trex unit to isolate it from
the local power grid.
User Guide Fieldbus Diagnostics application
September 2021
User Guide 175
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