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U
L T R A V I E W
D
I G I T A L
T
E L E M E T R Y
- S
E R V I C E
M
A N U A L
M
A I N T E N A N C E
The field service engineer should take all readings at the receiver
test port designed into the antenna system. The readings should
reflect the overall designed gain of the antenna system, as installed.
The field service engineer should test for excessive signal loss
(squelch) in the same way. Listing the rooms or mapping the area
that has signal loss might indicate an antenna, or a group of
antennas, that need to be checked.
Safety Verification
Safety testing of the telemetry equipment protects the patient from
electrical shock, especially micro-shock. It has been determined
experimentally that current values in the microampere range may
cause fatal arrhythmias in electrically susceptible patients. A patient
is deemed electrically susceptible when connected to monitoring
equipment.
The following safety tests are required:
•
Telemetry transmitters are battery operated and therefore do
not require a safety test for leakage.
•
The 90478 receiver modules that are operated inside a 90479-
A/B/C module housing have no patient-applied parts; 90478
receiver modules are I/O powered by and referenced to the host
module housing.
•
Current leakage from the monitor chassis to protective ground
must not exceed the values indicated in
, after
operating for 30 minutes.
Warning:
Never connect a patient to the equipment under test.
Table 4-1 Continuous Leakage Current Limits
United
States
(UL60601-1)
International (IEC 60601-1)
All
Conditions
Normal
Open Line
Open
Neutral
Reverse
Polarity
Open
Ground
Ground
(earth)
300
μ
A
500
μ
A
1,000
μ
A
1,000
μ
A
1,000
μ
A
N/A
Chassis
(enclosure)
300
μ
A
100
μ
A
500
μ
A
500
μ
A
500
μ
A
500
μ
A