11 Monitoring Twin FHRs
118
Only the FHR1 trace is offset. The numerical FHR value displayed on the monitor remains
unchanged. Subtract 20 from the recorded trace for FHR1 to obtain the true FHR1 value. For
example, if the recorded trace shows 160, then the true FHR is 140.
Switching Trace Separation On and Off
1 Connect three ultrasound transducers to the monitor to measure FHR.
2 See “Switching Trace Separation On and Off ” on page 116 for details of how to switch trace
separation on or off.
When Trace Separation is On
When trace separation is turned on, the recorder prints a dotted line labeled with the three FHRs at the
top, and at the bottom. Examples of the two methods (
Standard, Classic) for determining the
trace separation order are provided here.
When Trace Separation is Off
To indicate that trace separation is switched off, a dotted line labeled prints across the FHR scale.
1 "Standard" trace separation switched off here
2 "Classic" trace separation switched off here
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