3-20 BeneVision N17/BeneVision N15/BeneVision N12 Patient Monitor Service Manual
3. Insert the NMT module into the module rack of the monitor. Select the NMT parameter area of the
monitor to access the NMT Setup menu. Set the Stimulation Current to Supra(60mA). Set the Pulse
Width to 300μs. Perform a PTC measurement.
4. Check the voltage change detected by the multimeter and verify normal output of NMT stimulation.
Method 2:
Tools required:
Resistance box (0~9999.9 Ω)
Oscilloscope (Agilent DS0-X3014A)
1. Set resistance box to 1kOhm, connect stimulation electrodes to the resistance box.
2. Insert the NMT module to monitor. Set [Stimulation current] to [Supra (35mA)], [Pulse width] to 200μs.
Select [ST Mode] in NMT setup menu to start a ST measure.
3. Measure the voltage wave of the resistance box by oscilloscope, verify the pulse width is range from
180 to 220us, and calculate the Stimulation Current according stimulation voltage should be range
from 33 to 37mA.
Sensor Check
Tools required: None.
1. Connect the patient monitor, NMT module, and NMT accessories.
2. Select Main Menu → Maintenance → enter the required password → Module → NMT.
3. Follow the on-screen instructions to check the NMT sensor.
If sensor check completes successfully, the message Test passed. The function of NMT sensor is OK is
displayed, indicating a functional sensor. If the check fails, check whether the sensor is placed correctly as
instructed, and perform the sensor check again.
Stop NMT measurement or calibration before starting NMT sensor check.
Avoid forcefully striking the sensor.
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