Appendix B
Troubleshooting
47
On starting up the software, an alert indicates that there is a problem
with the front-end or driver
The correct Bridge driver is not installed on your computer (it should
be in the Essential Files folder, inside the LabChart or Scope folder).
•
Reinstall the software.
You are using an early version of LabChart or Scope.
•
Upgrade to the latest version of the software. Contact your
ADInstruments representative for information.
The BNC or I
2
C cable is faulty.
•
Replace the cable and try again. Immediately label all cables
proved faulty so that you don’t use them again by accident.
The Bridge Amp is faulty.
•
This is the least likely event. If the Bridge Amp will not work
properly after the previous measures, then try using it on another
PowerLab. If the Bridge Amp’s Status indicator fails to light with a
second PowerLab, the Bridge Amp may be faulty. Contact your
ADInstruments representative to arrange for repairs.
The trace will not zero properly when using the automatic or manual
zeroing controls
Variations in the transducer signal during auto-zeroing may cause the
software to fail to zero the offset properly, if it zeroes at all.
•
Make sure that the transducer is kept still and that no varying
signal is applied during auto-zeroing.
The transducer is defective or subject to excessive load, causing the
offset range of the Bridge Amp’s zeroing circuitry to be exceeded.
•
Check the transducer with another Bridge Amp if possible and try
again. Contact the supplier or manufacturer of the transducer if
there still seems to be a problem.
You are using an unmodified half-bridge transducer.
•
Half-bridge transducers may require rewiring with compensating
resistors before they can be used with Bridge Amps.
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