HP Codemaster 100 User Manual page 176

Using the Pacer
HR meters and HR alarms function during pacing, but they can be
WARNING
unreliable. The HR meter attempts to count QRS activity in both demand
and fixed pacing modes. Observe the patient closely while pacing. Do not
rely on heart rate alarms or the indicated heart rate as a measure of the
patient's perfusion status.
If the battery runs out during pacing and you replace it with a charged battery, the
NOTE
instrument may no longer be in pacing mode. To resume pacing, press Pacer On
and Start/Stop.
8-6