Summary of Contents for Z-15

Page 1: ...ine in gear at minimum throttlesetting THERMOCLINES Thetemperature of waterin the lake is seldom constant fromtop to bottom Layers of different tem peratures form and the junctionof awarm and cool layerof water is called a thermocline The depth and thickness of thethermocline canvarywiththeseason or time of day In deeplakesthere may be two or more at different depths Thermoclines are import ant to...

Page 2: ...t rangewill be printed on the paper immediately This will not change thedepth setting LINES When the Z 15 is firstturned on depth lineswill be printed on thepaper If you desire to turn the Linesoff pressthe LINES key To turn the lines backon pressthe LINES key again Example Turn linesoff Press LINES key MARKER Aneventmarkerfunction is in cluded in the Z 15 so that events maybe marked whendesired T...

Page 3: ...ample Setrange to 40 60feet Press 4 0 UPPER LIMIT The range will then be displayed See Figure 17 The Upper and Lower Limits can be used in variouscombina across the face oftheplaten around the frictionroller over thetake up core and tape it sciuarely to the take upcore See Figure 30 Small pieces of tapemaybe stored inside the housing for this purpose Close the top oftheplaten assembly by pressing ...

Page 4: ... the holder Besureit moves freely in the two slots If not bend the stylusaway fromthe edge it is rubbing on until itdoes move freely 7 Afterinstalling if the stylus won t print all the way down the paperas shown in Fig ure 35 bend the rightlegdown sothat more pressure is ex ertedagainst the stainless steelplate If it still does not printall the way bend the left leg down more butnot so far that it...

Page 5: ... the platen to expose thestylus belt 3 Thestylus belt rides over two wheels located at the right edge of the platen assembly Referto Figurel on page 2 Move the front of the belt DOWN to position the stylusat thecenterof the platen 4 Grasp the beltat the stylus holderwith the thumband forefinger and moveit gently to the leftwhile pushing the beltoff the wheels with the otherforefinger See Figure36 ...

Page 6: ...allpieces of tape Don tforgetto tapethepaperto thetake up core Don t rotate thestylusbelt up Don t useoilycloths strongsol vents or abrasive cleansers TROUBLESHOOTING SECTION Symptom On Offswitch is ON butthe stylusand paperdon t move What To Do Checkfuse checkconnections at battery fortightnessand corrosion Symptom On Off switchis ON have zero mark but no echoes or bottom signal What To Do Besure...

Page 7: ...se to turn the uniton The Sensitivityknobworks much like the volumecontrol on a radio that loo is weakersignalswill be detected withhighersettings of the knob When cruising or at othertimes whenjustsimplebottom contour information is desired the Sen sitivitysettingcan be low In deep wateror oversoft muddy bot 200 toms which produce weak 8 at3db echos thesettingwill have to be higher intothe unitan...

Page 8: ...ll blend together and showup as one fish or pos siblyevena blob onthe paper With a 400 p s transmitpulse width thosesametwo fish will have to be at least 12 inches apartbeforetheywill show up as two separate arches on the graph This is whyit is important to leave eration This chapterwill describe several otherfeatures that will en able the seriousoperatorto get the maximum benefit fromthis equipme...

Page 9: ...er pulsecoming backfrom the bottom or fromfish This is called Probabilityof EchoDetection The probability of the unitbeing ableto detect an echo returning from deep water is diminished be cause the furtherthesound pulse hasto travel the weakerit be comes By broadening thepulse length inessence a larger signal is transmitted and it is easierfor the receiverto detectit Forthisreason themicro com put...

Page 10: ...s micro processor that enables it to process theoutputfromthe re ceiver determine which signals are noiseand eliminate them then printonly the legitimate echoes Using this concept the transmit tedpulsedoesnothaveto be increased thereforerecords with high resolution and high noise im munitycan be achieved TheSuppressor Control may be used withtheDiscrimination to cancel OUT heavyinterference or noi...

Page 11: ...er speeds Also the scalenum bers are spread out more mak ing them more legible 2 Reduces thepossibility of wrap around This is theun desirable occurrence of the second orthirdbottomecho printed on the paperatthetop or middle of the page Many timesthiscaninterfere withfish or othertargetsthat youwish to see 3 Reduces the reverberation ef fect This happens mainly on lowerfrequencyunits but it can ha...

Page 12: ...bottom of the page simply press 2nd and then thecorresponding key DISC SCC MARK or PULSE and itwill be reprinted immediately EAGLE Paper Saving Feature Z 15 COMPUTERGRAPH APPROXIMATE PAPER SPEED Without Alternate Transmitand Print INSTALLATION INSTRUCTIONS LOWER LIMIT Minimum Paper Speed Maximum PaperSpeed Inches Hours Inches Hours RANGE feet 10 120 Per Mm Per Roll Per Mm Per Roll 1 0 10 2 35 4 25...

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