User Manual

1‐12ImportantInformationExpressionMR400InstructionsforUse
Using Batteries Safely
Batterieshavelifecycles.Thebatterylifeisatanendwhentheequipmentoperatingtime
providedbybatterypowerbecomesmuchshorterthanusual(i.e.,whenthetotalbattery
capacityhasonly70percentitsinitialcapacity).Foroptimalbatterylife,pleasefollowthese 
guidelines:
•Donotstorethebatteries
inadischargedcondition.Alwayschargeabatterytoatleast40
percentofcapacitybeforestoring.
•Chargethebatteriesonceamonthwhennotinuse.
Immediatelyremoveanybatterythathasanexpiredlifecycleandreplaceitwithanewbattery
ofthesametype.(Refertopage1
‐37forpartnumbers.)Toensurethesafetyofoperatorsand
patients,observethefollowingwarningsandcauti ons.
Recommended Separation Distances between Portable and Mobile RF Communications Equipment
and the Expression MR400 MRI Patient Monitoring System
The Expression MR400 MRI Patient Monitoring System is intended for use in an electromagnetic environment in
which radiated RF disturbances are controlled. The customer or the user of the Expression MR400 MRI Patient
Monitoring System can help prevent electromagnetic interference by maintaining a minimum distance between
portable and mobile RF communications equipment (transmitters) and the Expression MR400 MRI Patient Monitoring
System as recommended below, according to the maximum output power of the communications equipment.
Rated Maximum Output
Power Of Transmitter
(W)
Separation Distance According To Frequency Of Transmitter (m)
150 KHz to 80 MHz
d = (3.5/V1)
80 MHz to 800 MHz
d = (3.5/E1)
800 MHz to 2.5 GHz
d = (7/E1)
0.01 0.117 0.117 0.233
0.1 0.369 0.369 0.738
1 1.167 1.167 2.333
10 3.689 3.689 7.379
100 11.667 11.667 23.333
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in
meters (m) can be estimated using the equation applicable to the frequency of the transmitter, where P is the
maximum output power rating of the transmitter in watts (W) according to the transmitter manufacturer.
• At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
• These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and
reflection from structures, objects and people.
P
P
P