GE MAC 1200, Руководство по обслуживанию

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7-8 MAC

1200 resting ECG analysis system Revision D

2012250-095
Service and Maintenance: Technical Inspections/Preventative Maintenance
Safety Analysis Tests
General Information
The suggested safety analysis tests refer to the international standard IEC 601-1.
The tests are generally performed with safety testers, the measuring circuits of most
of which are calibrated according to IEC 601.
The following is a general description of the tests to be performed. for the handling
of your Safety Tester follow the user manual.
The tests may be performed under normal ambient conditions of temperature,
humidity and pressure and with line voltage.
The leakage currents correspond to 110% of rated voltage for the tested unit. Most
safety testers take this into account, otherwise the measured values have to be
calculated.
Recommended Test Equipment

Safety tester for measurements according to IEC 601.
 Testing connector according to the following description.
Protective Earth Resistance Test
The power cord is to be included in the protective earth resistance test.
This test determines whether the device has a power ground fault.

The protective earth resistance from power connector to any protective earth
connected exposed conductive part is measured.
 Specification of test circuit: AC current source 50 Hz/60 Hz of at least 10 A up
to 25 A with limited output voltage of 6 V.

If resistance is greater than 100 mOhm, the unit fails this test.
Measurement of Leakage Current
To perform the suggested measurements, the unit being tested has to be separated
from any interconnection to a system. If the unit is part of a system, extended tests
according to IEC 601-1-1 have to be performed. The diagram on the following page
shows the Measuring Circuit [M] required for leakage current. The reading in mV
corresponds to mA (leakage current). The safety testers generally work with this
Measuring Circuit [M] and the displayed values are already converted to leakage
current.
020A
MV
0.015

F
10 k
1 k
Measuring
Device
(R
1
>1 M

)