The Main menu options are displayed in the middle of the screen with Up ‘▲’ and Down ‘▼’ indicators above and
below the option to indicate how to scroll to the next option. The current time and date are displayed at the bottom
of the screen.
Checking Impedances
LEAD CHECK is the first option displayed on the LCD screen after patient hook-up and is a valuable tool for
verifying and optimizing signal quality before starting a recording.
From the Main menu, scroll to LEAD CHECK using the Down or Up key. Press the Enter key to select this
option.
A graph depicting the impedance measured at the Right Arm (RA), Left Arm (LA), Left Leg (LL) and V1 through
V6 electrodes is displayed from left to right in vertical columns on the screen. The higher the bar, the better the
contact is between the skin and the electrode.
A full-bar graph means optimal high quality and good electrode contact. For good quality recordings, the bars
should reach or exceed the horizontal line on the display. A low-bar graph means poor quality and high electrode
impedance. The skin preparation should be checked for improvement and, if necessary, the electrode(s) should be
replaced.
Once acceptable impedance levels are verified, press any of the three keys to return to the Main menu.
▲
LEAD CHECK
▼
10:24:20
06/24/2002
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