Service manual

UCW and Ultraview 1700 Monitors — Service Manual
4-4
Normal Condition — Condition in which all means provided for protection are intact. Includes
ground connections, insulation, creepage and clearance distances.
Single Fault Condition — Open ground, open neutral, line voltage on a patient connection, or any
single state other than normal condition that could compromise patient safety.
UUT — Unit Under Test
Spacelabs Medical does not endorse standards to the exclusion of others. BE SURE TO CHECK
YOUR LOCAL REQUIREMENTS TO ENSURE YOUR EQUIPMENT SAFETY TESTS COMPLY
WITH LOCAL STANDARDS. Generally accepted standards for medical monitoring equipment,
such as the Underwriters Laboratory (UL) and the National Fire Protection Association (NFPA)
standards, are summarized in
Table 1 below.
Equipment Required: Electrical Safety Analyzer, Fluke model 232D or equivalent
These tests should be performed according to the hospital’s scheduling requirements, at least
annually or after repair or modification.
Ground Resistance
1. Attach the power cord to the monitor under test, then measure the resistance from the AC
power cord third wire ground to a chassis location, such as the equipotential post on the rear
of the monitor.
2. Verify that the resistance is less than 500 milliohms (0.5 ohms).
Table 1: Summary of standards for medical monitoring equipment
International Mains to
Chassis Leakage
US (120 V) Mains to
Chassis Leakage
Mains Resistance
100 µA - normal condition, ground
attached (AC connector to chassis)
300 µA - normal condition, ground
attached (AC connector to chassis)
500 milliohms*
500 µA - single fault condition,
open ground or reverse polarity
300 µA - single fault condition,
open ground or reverse polarity
500 milliohms*
* Measured from the AC Power cord third wire ground to the most distant ground attachment
!
• All tests must be performed according to the safety analyzer’s operations manual,
and any local requirements.
WARNING:
• Before starting safety tests, ensure that no patient is connected to the
device under test. If safety tests must be performed on equipment currently
monitoring a patient, obtain permission to disconnect the cables from the
monitor and patient.