Automatic Blocking; Setting Of Filters - Innomed Medical HeartScreen 80G-L1 User Manual

8.1.

Automatic blocking

The fault (inadequate contact) of any lead (even if not indicated on the display) is resulted in
automatic blocking, which causes the termination of monitoring, and the BLOCK message
appears in the middle of the display. In such case it is advisable to check the ECG electrodes.
If there is too much noise, the amplifier input stage over-controls due to high input electrode
potential or defibrillator use, in this case as well, automatic blocking happens, indicated by
the "BLOCK" message, followed by filter initialization. This is indicated by a "Wait..."
message.
After blocking the device examines if the error still exists. If so, it repeats blocking and
performs filter initialization.
Warning!
Due to automatic blocking and filter settling, 6 seconds must be waited if pre-start is turned
on, and 4 seconds if turned off, before the curve appears again.
For this reason, in case of possible defibrillator use, it is recommended to turn the pre-start
function on in the Settings / Printing / Pre-start menu item. Detailed description on pre-start
can be found in the chapter dealing with manual and automatic printing.
If any of the curves has shifted, went out of the picture permanently in horizontal direction or
it is covering another curve, the problem can be solved by manual blocking, by pressing the
key. (Section no. 8.6.5)
8.2.

Setting of filters

There are three types of filter in the device, which are the baseline filter, the mains filter and
the muscle filter. The mains and the muscle filters can be switched on and off from the
keyboard, their state is indicated by the symbols visible on the upper line of the display.
The baseline filter can be switched on and off in the Settings/Filters menu point (see Menu
Handling). The mains filter frequency can be set in the same menu point, which is 50Hz in
Europe and in Asia, Africa and America it can be 60 Hz as well. When installing the device,
the mains frequency valid in the place of application should be set.
The baseline filter makes it possible to create better quality records than previously, by the
suppression of baseline shift. During printing and monitoring, the baseline filter ensures the
followings:
 slow change of polarization and contact potential generated by all means on the
electrodes
 most of the noises caused by patient respiration and by patient movement do not
influence the ECG signal to be examined
The baseline filter causes an approximately 2.5 seconds signal delay, so you should wait 2.5
seconds after blocking, electrode placement and movement, in order to receive a good quality
signal.
During blocking, the baseline filter is reset, the "Wait..." message appears on the display until
the filter sets in and the delay period passes. During this time period printing, storing and
analysis program cannot be started
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HS80G-L1 Users' Manual
R-7317-2-B