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Philips FM20/30 Instructions For Use Manual Page 163

Release j.3 with software revision j.3x.xx patient monitoring.
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12 Monitoring Twin FHRs
The following trace shows trace separation switched on.
Only the FHR2 trace is offset. The numerical FHR value displayed on the monitor remains
unchanged. Subtract 20 from the recorded trace for FHR2 to obtain the true FHR2 value. For
example, if the recorded trace shows 160, then the true FHR is 140.
"Classic" Separation Order
To make differentiating the traces easier, the trace from the ultrasound transducer connected to the
FHR1 channel is separated from that of FHR2 by 20 bpm. In other words, the trace for FHR1 is
recorded 20 bpm higher than it really is. The trace for FHR2 is never shifted.
The recorder prints a dotted line labeled+20 across the FHR scale, to identify the trace for FHR1. The
FHR trace is labeled +20 every 5 cm:
The label for FHR1 is annotated with a black filled +20:
The following trace shows trace separation switched on.
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.
163

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