55
Table 1 Input Impedance
Lead Electrode
The summit vlaue of deflectionfront
traced by K open circuit (mm)
Lead Position
Connecting to P1
Connecting to P2
Single Channel ECG
Multi-channel ECG
Ⅰ
,
Ⅱ
,aVR, aVL,
aVF,V1
R
All other Lead
electrodes
Ⅰ
,
Ⅲ
,aVL, aVR,
aVF,V2
L
All other Lead
electrodes
Ⅱ
,
Ⅲ
,aVF, aVR,
aVL,V3
F
All other Lead
electrodes
Vi(i is 1
～
6)
Ci
All other Lead
electrodes
8
Vx, Vy, Vz
A,C,F,M
I, E, H
—
8
1.13
Features of Amplitude Frequency
When the filter is shut off, take 10Hz sine wave as reference.
From 0.5 to 50Hz, the tolerance of amplitude of frequency is -10%
～
+5%.
From 50 to 70Hz, the tolerance of amplitude of frequency is -30%
～
+5%
1.14
Features of Low Frequency .Time Constant no less than 3.2s
1.15
Baseline stability
1.15.1
Stable Power: baseline drifting should be no more than 1mm
1.15.2
Unstable Power: baseline drifting should be no more than 1mm
1.15.3
Sensitivity (no signal input) : baseline drifting should be no more than 2mm
1.15.4
Temperature Drift: From 5
～
40
℃
, baseline drifting should be no more than 0.5mm/
℃
1.16
Paper Speed
6.25 mm/s 12.5 mm/s 25mm/s and 50mm/s , tolerance :
±
5%
1.17
The impact of AC to DC conversion
The DC indicator should be lit when changing AC to DC conversion. All operation
should be normal.
1.18
Printing resolution (Thermal matrix printing)
Y axis
≥
8 dots/mm
；
X axis
≥
32 dots/mm
（
Paper speed 25 mm/s
）、≥
16 dots/mm
（
Paper speed 50 mm/s
）
.
1.19
Request of Thermal matrix printing
Printer can record letters and marks. When recording, the printer could print out lead, paper
speed, gain and etc.
