Natus® Brain Monitor &
Embla Dx Series™
User and Service Manual
48
Troubleshooting
If the acquired waveforms are flat, do not appear, or do not appear correctly (or as expected), try shutting
down the computer for at least 10 seconds, and then set up the test again from the beginning. Shutting
down and starting over resets the headbox and sometimes solves the problem. If you are still
experiencing problems, here are some more solutions to try:
Troubleshooting Checklist
Ask the patient to relax.
Inspect your cables.
Make sure that there is a tight connection between the headbox, the breakout box and the
computer.
Make sure that the patient electrodes are connected to the correct channel in the headbox.
Make sure that the patient electrodes fit properly into the headbox (not loosely).
Make sure that there are no apparent breaks in the patient electrode cables.
Are any of the electrodes touching? If so, they are causing a short circuit and will develop an
artifact.
Unplug any other devices on the same circuit such as printers, mechanical beds, vacuum
cleaners, or other potential sources of interference.
Install a medical grade ground to make sure that your clinic has a properly grounded electrical
system.
Change the acquisition cable. You should always have a backup acquisition cable.
Check the gain and timebase settings to ensure that they are appropriate for the current test.
You may also want to check the LFF, HFF, and Notch filter settings. (Choose
Edit >Settings >
Montage
.)
LFF
–
Filters out low-frequency interference.
HFF
–
Filters out high-frequency interference.
Notch filter
–
Minimizes electrical interference.
Gain
–
Increasing gain makes traces appear larger.
