Appendix A - Technical Specifications - NorthStar 491 Install Manual

APPENDIX A — Technical specifications
491 INSTALLATION MANUAL Revision A
Table 8: 491 technical specifications
Performance characteristics
Frequencies
Output power
Pulse lengths
Pulse repetition rate
Alarms
Update rate
Zoom modes
Auto modes
Navigation data
Display modes
Physical characteristics
Dimensions
Weight
Environmental characteristics
Temperature
Standards
Electrical characteristics
50 and 200 kHz
1000 watts with dual-element transducers
600 watts with single-element transducers
0.1 to 2 ms
30 to 600 pulses/min
Fish, bottom, and temperature
10 Hz maximum (depends on water depth)
(up to 20Hz when used with the Northstar
6000i)
Marker, bottom lock, bottom lock/center,
bottom
Fishing or cruising
Shown on bottom of screen
Single/dual frequency, split-screen, four
zoom modes, A-Scope
8.78 x 7.22 x 2.35 inches (including back-
plate)
2 pounds
-25˚C to +60˚C operating temperature
-55˚C to +90˚C storage temperature
Waterproof, sealed design meets the follow-
ing: EN60529 IP65; EN60945 emissions; CE
8 to 36 VDC, 8 watts, reverse polarity and
overvoltage protection
Transducer outputs protected against open
circuit/short circuit
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