Datascope Passport - Mindray

Appendix Indirect Blood Pressure Measurements And Associated Errors
TABLE 6-8
RECOMMENDED SEPARATION DISTANCES BETWEEN PORTABLE AND MOBILE RF
COMMUNICATIONS EQUIPMENT AND THE GAS MODULE SE OR GAS MODULE 3
The Gas Module SE and Gas Module 3 are intended for use in an electromagnetic environment
in which radiated RF disturbances are controlled. The customer or the user of the Gas Module SE
or Gas Module 3 can help prevent electromagnetic interference by maintaining a minimum
distance between portable and mobile RF communications equipment (transmitters) and the Gas
Module SE or Gas Module 3 as recommended below, according to the maximum output power
of the communications equipment.
RATED MAXIMUM OUTPUT
POWER (P) OF
TRANSMITTER IN WATTS
(W)
SEPARATION DISTANCE (d) IN METERS (m)
ACCORDING TO FREQUENCY OF TRANSMITTER
150 kHz to
80 MHz
80 MHz to
800 MHz
d = 1.2 x P d = 1.2 x P d = 2.3 x P
0.01 0.12 0.12 0.23
0.1 0.38 0.38 0.73
1 1.2 1.2 2.3
10 3.8 3.8 7.3
100 12 12 23
For transmitters rated at a maximum output power not listed above, the recommended separation
distance d in meters (m) can be determined 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.
NOTE: At 80 MHz and 800 MHz, the separation distance for the
higher frequency range applies.
NOTE: These guidelines may not apply in all situations.
Electromagnetic propagation is affected by absorption
and reflection from structures, objects and people.
6.6 Indirect Blood Pressure Measurements And
Associated Errors
800 MHz to
2.5 GHz
Place the patient in a supine position to obtain true physiological pressure. If the cuff is not at
the patient’s heart level, the pressure values obtained will not reflect the true physiological
pressure. Instead, the readings will be decreased by 1.86 mmHg for every inch the cuff is
placed above the heart level and increased by 1.86 mmHg for every inch the cuff is placed
below the heart level. This effect is due to hydrostatic pressure.
Blood has weight and it is this weight that influences these blood pressure readings. The
value of the weight of blood depends on where the measurement is taken with respect to the
heart. When the patient is supine, on a flat surface, the arm is near enough to the heart level
so no adjustment of the NIBP readings will be necessary.
Passport 2®/Passport 2 LT Operating Instructions 0070-10-0649-01 6 - 39