TRIGGER OUTPUT
18 Model 3000T series Operation Manual
SYNCHRONIZED OUTPUT
(Trigger)
The Synch Pulse
The ECG Synchronized Output produces a trigger pulse starting at the peak of each R-wave, which is available on
the SYNCHRONIZED OUTPUT BNC connector and on the ECG X1000 output (ring on the ¼” stereo jack)
connector on the rear panel of the monitor. Connect the Synchronized Output from the monitor to the device being
synchronized.
The following shows the timing of the trigger pulse compared to the ECG waveform.
Trigger Spot
Trigger Mark
5 V
0 V
100 ms*
*The model 3000T that is available in Japan may be set to generate a trigger pulse of 50ms (width) and 0-5V
(amplitude) instead of the standard trigger pulse of 100ms and 0-5V.
Trigger-Mark Display
The Synchronized trigger output is always active. A portion of the ECG waveform corresponding to the timing of
the synch pulse is highlighted in red.
If the trigger function appears to be erratic verify the following:
Select lead with the highest amplitude, typically Lead II.
The proper placement of the ECG electrodes. The ECG electrodes may need to be repositioned.
The ECG electrodes still have moist conductive gel.
Polarity Lock (P-LOCK)
With some patients’ ECG’s the shape of a tall T wave or deep S wave sometimes matches the criteria used to detect
the R wave. When this situation occurs the monitor correctly detects the R wave and then falsely detects the T wave
or S wave causing double triggering. The polarity control algorithm (P-Lock) reduces the number of false triggers
when tall T waves or deep S waves occur. The P-Lock algorithm allows the Model 3000T to detect and trigger only
at the peak of the R wave, rejecting most of the tall T waves and deep S waves that might have caused false triggers.
To turn P-Lock ON / OFF follow the next steps:
1. Press the [SETUP] key and press the [ECG] key to access the ECG menu.
2. Press the [OPTIONS] and select [P-LOCK] to enable or disable the P-Lock algorithm.
3. Press EXIT to return to the main menu.
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