TONEOHM 950 OPERATOR MANUAL
6-2
What are the symptoms of multiple shorts?
If the results of probing the stimulated plane are inconclusive, try probing the un-stimulated plane. If
varying readings greater than 5.0 are obtained, this suggests that there are multiple shorts between the
planes.
How do I find multiple shorts?
These shorts are more difficult to locate since the Direction Arrows cannot be used. The technique
reverses the method used to find a single short — in this situation the user probes the un-stimulated
plane and looks for the highest reading in the display. Since the Arrows cannot be used it will be
necessary to probe the plane randomly until an area is found where the readings are higher than
surrounding points on the plane. Then probe all the points in that area to find the highest reading.
What if the results are still inconclusive after testing for multiple shorts?
This may indicate that there are multiple catastrophic device failures on the board causing multiple high
resistance paths between the planes. To troubleshoot in this situation it will be more effective to use an
instrument such as the T3000 Fault Locator to test components on the board and replace them as
necessary.
The Direction Arrows point in different directions when points that are close to each other are probed.
This indicates that the probe is close to the short. Ignore the Arrows and use the probe to find the lowest
displayed reading.
Two of the Direction Arrows are lit at the same time.
This also indicates that the probe is close to the short. Ignore the Arrows and use the probe to find the
lowest displayed reading.
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