Checking Frequency Transfer; Checking Filter - Innomed Medical Heart Screen 60G Service Manual

Simultaneous 12-channel ecg devices with 58 / 80mm wide 1- / 3-channel built-in printer and lcd display

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Innomed Medical

8.3.6 Checking frequency transfer

Apply +DC signal onto the amplifier's input (2000 +/-0.5% RVpp / 150 Hz sine) from a ground independent generator

according to the table. DC must be +320, -320 mV.

The filter must be off.

Connect the patient cable according to the following tables and with the channel selector start the channels one-by-one,

and measure the signal amplitude or during 50 mm/sec *1 printing.

a/ In case of DC = -320 mV

The signal's amplitude on the examined lead must be min. 1400 RV.

b. In case of DC = -320 mV

The signal's amplitude on the examined lead must be min. 1400 RV.

a. "Line" filter on at 50Hz

Apply 4 mVpp 50Hz sine signal from the generator between the device's V2 and all other connected inputs. The filter

is acceptable if the dampening is less than 20dB when the frequency is changed in the 48.5 Hz - 51.5 Hz range. The

measurement should be performed on the V2 lead by making a recording at 50 mm/sec speed and normal amplification

with the filter on. The recorded signal must be less than 4 mm.

b. "Line" filter on at 60 Hz

Apply 4 mVpp 60Hz sine signal from the generator between the device's V2 and all other connected inputs. The filter

is acceptable if the dampening is greater than 20dB when the frequency is changed in the 59 Hz - 61 Hz range. The

measurement should be performed on the V2 lead by making a recording at 50 mm/sec speed and normal amplification

with the filter on. The recorded signal must be less than 4 mm.

2014.01.09

Heart Screen 60G-80G-L

Examined lead

all other

Examined lead

all other

Measured amplitude

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D-5450-1-B_HS60G80GL_SM_ENG.doc

Service manual

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Heart screen 80g-l