Performance Verification and Safety Tests Performance Verification Tests
4-12 PageWriter TC 70 Cardiograph Service Manual
5 Verify the following items when printing is complete:
– Trace activity for all leads. Confirms integrity for all patient electrodes and leadwires.
Noise should measure less than one (1) mm, with no baseline wander.
– No gross distortion of complexes or calibration pulses (no overshoot and so forth).
– Duration for calibration pulses for correct paper speed. With cardiograph set to record
at 25 mm/sec, the calibration pulse should measure 5mm (calibration pulse duration is
200 ms).
– Calibration pulse amplitude is correct.
NOTES An arrhythmia simulator is not an acceptable tool for verifying computerized ECG analysis. The
analysis software is biased to process human ECG data.
Noise may be an artifact of poor connections to the simulator or position of the cables. If noise
appears, check the connectors or adjust the cable drape.
Safety Tests
This section covers tests of the cardiograph’s electrical safety.
NOTE The device is an electrical Class II device in which the protection against electric shock does not rely
on basic insulation and a protective earth conductor but on double and/or reinforced insulation.
Test Notes
Use the procedures called out by the manufacturer of the safety analyzer in use.
Test both Normal and Reverse polarity line connections for each test, and record the
worst-case value.
Use the barrel of the PIM connector to connect a test lead to chassis bare metal for the
leakage tests.
PIM connector
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