Kongsberg EM 712 Maintenance Manual page 133

Maximum coverage and depth
Beamwidth 0.25 x 0.5
Winter * 3800
Summer * 4400
Winter * 3400
3600
Summer *
Estimated depth and coverage for EM 712, based on BS= -20dB, NL= 35 dB, f = 40 kHz
Dual swath restrictions
FM mode is used to extend the maximum range capability.
Since the relative ping rate increases at large depths (caused by reduced angular
coverage), the need for dual swath decreases with depth. In the Very Deep and Extra
Deep modes long FM pulses are prioritized, so dual swath is not available in these modes.
Reduced power output (Mammal protect)
Maximum intensity is encountered in a thin wedge extending below the ship with an
angular coverage of about 140°. The intensity level may be lowered by 10 or 20 dB by the
operator. The EM 712 may be set in a mode to begin pinging with a flexible soft-start as
a possible means of inducing marine mammals to leave the area of high intensity sound.
451106/B
0.5 x 0.5 0.5 x 1
Maximum coverage
3600 3450
4200 3950
Maximum depth
3200 3000
3400 3200
Technical specifications
1 x 1 1 x 2
3250 3050
3700 3550
2900 2700
3100 2900
2 x 2
2850
3250
2600
2800
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