4-16 250 Series Maternal/Fetal Monitor Revision D
2020551-001
Maintenance: Electrical Safety Tests
Patient-to-Line Leakage for US2
1. Connect an US test body to the monitor’s front panel US2 input. The US test
body should be an ultrasound transducer wrapped in aluminum foil.
2. Set the fixture’s Leakage switch to Line.
3. Turn ON the monitor using the monitor’s power switch.
4. Verify the following:
< 50 µA (100, 120, 220, 230, or 240 VAC monitors)
5. Record the patient-to-ground leakage for the following conditions:
Ground Continuity
Use an ohm meter to confirm continuity between the monitor’s AC connector inlet
ground pin and unit’s chassis.
Dielectric (Hi-Pot) Tests
CAUTION
POWER OFF—Turn off the monitor prior to performing any of
the hi-pot tests.
Patient–to–AC-Line Using DC Voltage for 1 Minute
Connect the monitor to the hi-pot tester as shown on in the figure below.
NOTE: The hi-pot tester voltage is 5.656 kVdc.
Table 8. Patient-to-Line Leakage Conditions for US2
Neutral Ground Power (Polarity)
Closed Closed Normal
Closed Closed Reversed
Open Closed Normal
Open Closed Reversed
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