Checking Filter; Checking Cmrr; Printing Ecg Signal - Innomed Medical Hear Screen 112C-1 Service Manual

Innomed Medical Heart Screen 112C-1 Service manual

6.2.6 Checking filter

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.
c. "Noise" filter on
Apply 4 mVpp 35Hz 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. 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 27 mm.

6.2.7 Checking CMRR

a. Checked with 50Hz signal
Connect the patient cable to the M13 measurement device, to which input apply 20 Veff 50Hz sine signal.
Amplification *1. Start AUTO recording and check the signal size on the paper. Acceptable if the signal is not
greater than 5.6 mm.

6.2.8 Printing ECG signal

Set PACE MAL operating mode on the Phantom 320 generator and make approximately 10 seconds long
printouts from all groups at 25 mm/sec speed and *1 amplification. Check the printout quality. The curve must
be continuous and clearly visible.
The recording must be repeated in normal heart rate 60 position by connecting the pacemaker generator, set to
700mV/2ms, in series with the R lead.
Make 6 seconds long recording in automatic operating mode.
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