User & Service Manual Xltek EMU 128 Headbox
16
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
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Ask the patient to relax.
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Inspect your cables.
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Make sure that there is a tight connection between the headbox, the breakout box
and the computer.
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Make sure that the patient electrodes are connected to the correct channel in the
headbox.
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Make sure that the patient electrodes fit properly into the headbox (not loosely).
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Make sure that there are no apparent breaks in the patient electrode cables.
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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.
To Adjust the Gain, Timebase and Filter Settings
Choose Edit->Settings->Montage tab. To change the three filter settings (LFF,
HFF and Notch filter), right-click a cell in the appropriate column and select a
value from the menu.
•
LFF (Low Frequency Filter): Filters out low frequency interference below the
set value.
•
HFF (High Frequency Filter): Filters out high frequency interference above the
set value.
•
Notch filter: Minimizes interference from nearby electrical equipment.
•
Gain: Increasing the gain (sensitivity) of a channel makes the traces appear
larger on the screen.
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