Fukuda Denshi IB-7300, Service Manual

Page: 133 / 146

No. Check Item Check Procedure Criteria
4. ECG
01 Input
Impedance*
Measure input impedance by
comprehensive tester. Should be 5M Ω or above.
02 Suppression
Characteristic of
Common-Mode
Signal
With SG-2000, input 50Hz or 60Hz
20Vr.m.s. signal, and measure
fluctuation of each lead. Should be 10mmp-p or below for
standard sensitivity (sensitivity
1).
03 Transient
Characteristic*
With comprehensive tester, apply
standard voltage of 1mV, and check
the time the amplitude natural
logarithmically drops and becomes
37% of the waveform of 0.04 sec. after
the application of standard voltage. Diagnostic Mode: at least 3.2 sec
Monitor Mode: at least 0.3 sec
ESIS Mode: at least 0.1 sec
※ Baseline correction filter: OFF
04 Frequency
Characteristic
With comprehensive tester, apply
sinusoidal voltage. Measure the
frequency characteristic at test voltage
of 100Hz, 40Hz, 15Hz. Diagnostic Mode: at least 100Hz
(-3dB)
Monitor Mode: at least 40Hz
(-3dB)
ESIS Mode: at least 15Hz (-3dB)
※
Baseline correction filter: OFF
05 Heart Rhythm
Detection
With comprehensive tester, input both
positive and negative polarity of 0.3mV
and 3mV with sensitivity 1. Heart rhythm should be
detected.
06 ECG Accuracy* With comprehensive tester, apply 1mV
voltage and measure the display width. Error should be within
10mm±10% for sensitivity 1.
07 Record
Sensitivity
With comprehensive tester, apply 1mV
voltage and measure the recording
width. Error should be within ±10% for
sensitivity 1.
08 Heart Rate
Accuracy
With comprehensive tester, input
reference heartbeat signal of 60, 180
beats/min., and check the displayed
HR value. For reference heartbeat signal of
60, 180 beats/min., error of
displayed HR value should be
within ±3 beats/min.
09 ECG Lead
Switch
With comprehensive tester, input ECG
and check that each lead is displayed
properly.
※ Check for 3-electrode, 4-electrode,
5-electrode, 10-electrode.
For each lead cable, lead should
be correctly switched, and
waveform should be correctly
displayed.
10 Lead-Off
Indication
Remove each electrode, and check
that lead-off message is displayed. Lead-Off message for the
corresponded lead should be
displayed.
11 ECG Lead Cable
Recognition Switch the ECG lead cable or switch
the setup of lead cable recognition jig. Should correctly recognize the
connected lead cable.
12 Heartbeat
Sound*
With comprehensive tester, input ECG
and check the heartbeat sound. Correct heartbeat sound should
generate.
13 Alarm Function* Set the upper alarm limit to 120
beats/min., and change the reference
heartbeat signal from 80 beats/min. to
160 beats/min. Set the lower alarm
limit to 60 beats/min., and change the
reference heartbeat signal from 80
beats/min. to 30 beats/min.
Alarm should generate within 12
seconds from the changed time.
* As these functions are dependent on the design or software, these items are not required for periodic
check. Perform the test as necessary.
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