6-4 170 Series Monitor Revision D
2003023-001
Uterine Activity Monitoring: Tocotransducer (External Method)
More About Referencing
Out of Range Condition
After you press the UA Reference button, if there is insufficient range to provide at
least 100 relative units above the reference level (probably because the belt is too
tight), the UA display area flashes “– –”. If this happens, remove the tocotransducer
from the patient; re-reference with no pressure applied to the button; re-apply the
transducer to approximately 25 relative units above the baseline; then re-reference
one more time. If you still receive the same result, try a different tocotransducer or
contact your Service Representative.
Manually Setting the Baseline at the Default Value
Briefly pressing the UA Reference button sets the baseline at the default setting—the
default is configured via the service setup mode. The monitor is shipped from the
factory with a default setting of 10 relative units. Qualified service personnel can
access the service setup mode to set the baseline default to 5, 10, 15, 20, or 25
relative units. Refer to the “170 Series Service Manual” for more information.
Manually Overriding the Baseline Default Value
Pressing and holding the UA Reference button for more than two seconds causes the
UA reference level and display to override the default setting and cycle through all
available selections: 5, 10, 15, 20, or 25 relative units, starting at the default
setting—until the button is released. Once the button is released, the UA trace and
UA value take on this new value as a baseline for reference.
Briefly pressing the UA Reference button reverts back to using the default
setting configured via the service setup mode.
Automatic Baseline “Zeroing”
If pressure falls below 0 relative units (probably because the belt has loosened),
automatic UA referencing occurs and a new baseline reference is set at 0 relative
units.
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