Philips M3921A Service Manual page 47

Safety Tests
Safety Test Diagram - Patient Leakage Current - AC
Test or Inspection to Perform
Measures patient leakage current from Applied Part to earth caused by external
mains voltage on Applied Part with switch S5 open and closed. Each polarity
combination possible is tested using S2 and S6.
Safety test according to EN60601-1 (Clause 19.4.h). Report largest value.
Performance Verification 35