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Line-to-ground
Voltage dips, short
0 % U
; 0.5 cycle
T
interruptions and
voltage variations on
power supply input
At 0°, 45°, 90°, 135°,
lines
180°, 225°, 270° and
315°
IEC 61000-4-11
0 % U
; 1 cycle
T
70 % U
T
Single phase: at 0°
0 % U
; 250/300 cycle 0 %U
T
Power frequency (50/
30 A/m
60 Hz) magnetic field
IEC 61000-4-8
Note: U
is the a.c. mains voltage prior to application of the test level.
T
Electromagnetic immunity
0 % U
; 0.5 cycle
T
0 % U
; 1 cycle
T
; 25/30 cycles
70 % U
; 25/30 cycles
T
; 250/300 cycle
T
30 A/m
Mains power quality should be that of a typical
commercial or hospital environment. If the user
of the Welch Allyn Green Series IV, 300, 600,
and 900 Exam Lights requires continued
operation during power mains interruptions, it
is recommended that the Welch Allyn Green
Series IV, 300, 600, and 900 Exam Lights be
powered from an uninterruptible power supply
or a battery.
Power frequency magnetic fields should be at
levels characteristic of a typical location in a
typical commercial or hospital environment.
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