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Chapter 4 — External Sensor Mode

4-5

Installing External Distance Sensor

If you are planning to use an external distance sensor for distance measur-
ing, rather than the RAC Geo's internal GPS sensor, install the external 
sensor using the instructions that came with the external sensor.

Installing the 
RAC Instrument & Antenna

Refer to pages 2-2 and 2-4 for instructions on how to install the RAC in-
strument and its antenna.

Fig. 4.3 - External Sensor Instructions 

Summary of Contents for RAC Geo II

Page 1: ...i JAMAR Technologies Inc Distance Measuring with GPS User s Manual JAMAR Technologies Inc RAC Geo II...

Page 2: ...on it may furnish a new part in exchange for any part of any instrument of its manufacture which under normal installation use and servicediscloses such defect The instrument must be returned to the J...

Page 3: ...c 1500 Industry Road Suite C Hatfield PA 19440 We are pleased that you have chosen the RAC Geo II for your distance measuring needs We have strived to develop a unit that is easy to use and has the op...

Page 4: ...3 Key Functions 3 4 Menu Functions 3 7 Additional Features 3 25 External Sensor Mode 4 1 GPS Sensor or external sensor which is right for you 4 2 Switching from GPS Mode to External Sensor Mode 4 3 In...

Page 5: ...Chapter 1 Introduction 1 1 Chapter 1 Quick Start Guide Introduction to the RAC Geo II...

Page 6: ...op Turn on the Geo and wait for it to acquire a GPS signal as described below When first powered on the Geo will display GPS FO in the upper display and begin to look for GPS satellites This will swit...

Page 7: ...to vehicle Power can also come from any existing DMI power wiring if you already have this While the on board GPS receiver will track distance we recommend the use of the external GPS antenna for the...

Page 8: ...RAC Geo II User s Manual 1 4...

Page 9: ...Chapter 2 Installation 2 1 Chapter 2 Installation...

Page 10: ...he Velcro provided Two plastic L brackets are also provided to facilitate mounting to the top of the dashboard if that is your preferred location For best results attach the L bracket so that the bott...

Page 11: ...ider allowing enough slack in the cable to permit a passenger to hold operate the RAC if necessary Regardless of the mounting location Velcro strips are provided for quick easy mounting removal of you...

Page 12: ...st accuracy and quickest GPS lock To use the antenna screw it into the top of the RAC Geo being sure to get a tight connection Once screwed into the unit route the antenna to the roof of your vehicle...

Page 13: ...Chapter 3 Start Up Key Functions Menu Options 3 1 Chapter 3 Start Up Key Functions Menu Options...

Page 14: ...sed to display distance It is also used to indicate menu locations time and GPS coordinates The lower smaller display window referred to as D 2 is used to display count status speed interval distance...

Page 15: ...o will set itself in Count Hold with CH displayed in D 2 and 0 displayed in D 1 At this point the Geo is ready to start counting or access menu functions Fig 3 2 GPS Sensor Mode Start Up Fig 3 4 GPS S...

Page 16: ...ll be displayed in D 2 If speed is also being displayed it will continue as DH does not freeze the speed display Note You cannot put the RAC in both Count Hold and Display Hold at the same time Count...

Page 17: ...the ENT Enter key The options are Menu 1 Auto Calibration A CAL Menu 2 Manual Calibration E CAL Menu 3 Pre Distance P diS Menu 4 Clock Set CLoSEt Menu 5 Distance Pulse Output dPO Menu 6 Memory Store...

Page 18: ...ns while full dim may best suit night conditions Each time the Dim key is pressed the brightness will drop one level until the lowest level is reached It will then jump back to the high brightness lev...

Page 19: ...beginning at a known station This feature also allows you to Add or to subtract off a distance currently on display in D 1 Note The RAC must be in Count Hold to use Pre Distance Step 1 Press the Menu...

Page 20: ...r key or just let it continue to run To re turn to normal mode press the Menu key then the Enter key To Set Timer to Real Time Step 1 Press the Menu key then the 4 key then the Enter key D 1 shows the...

Page 21: ...ignal is provided on the red wire in the power signal cable The 5 VDC signal can be used to send distance pulsed to a computer or other device that can accommodate low voltage low current signals Shou...

Page 22: ...together at high speeds A 10 millisecond pulse duration is usually adequate for sending pulses to a laptop computer and will not overlap at normal highway speeds Step 4 Press Enter and you will be pro...

Page 23: ...dicatethattheDPOsignalhasbeen deactivated Step 4 Press Enter to return to the initial menu screen then press Enter again to exit the menu function You are now back in the normal mode with the DPO sign...

Page 24: ...r to the instructions for Menus 9 and 10 later in this chapter Step 1 Press the Menu key then the 6 key D 2 then indicates that you are in the Memory Store function Step 2 Press Enter D 1 displays the...

Page 25: ...release the Count Hold The distance in D 1 will begin to count once the vehicle begins to move The four digits in D 2 display the numeric code numbers as they are keyed in Using a numeric code 0 9999...

Page 26: ...that number by simply keying in the correct number This must be done prior to press ing the Enter key Once you hit the Enter key the code that was in D 2 is stored in memory Step 8 When the inventory...

Page 27: ...Step 2 Press Enter and the RAC will change to show the amount of memory remain ing and the number of surveys stored D 1 shows the percentage of remaining internal memory i e Str 95 means 95 of memory...

Page 28: ...nter and D 1 will begin flashing to alert you that you are about to clear ALL surveys in memory Step 3 Press Enter again and D 1 will change to Done indicating that the memory has been erased Step 4 P...

Page 29: ...events or up to 30 hours of data can be stored when using Track GPS Note Data collected in either of these modes must be downloaded using the RACPro software or other interface software Step 1 Press t...

Page 30: ...eyed in a date press Enter D 2 will then display Other At this point you have the option of enter ing a number up to six digits that can be associated with the stored data This could be the inventory...

Page 31: ...ric code 0 9999 you are able to identify up to 10 000 separate events for inventory purposes For example an intersection to the right might be a 1 to the left a 2 a bridge a 6 a telephone pole a 7 a p...

Page 32: ...leted press the CH key Key in an ending reference code such as 9999 to mark the end of the survey then press Enter Note that you can store up to 50 000 events in memory when in Store GPS mode You can...

Page 33: ...e to download your data to a computer Step 1 Press the Menu key then the 1 and 1 key D 2 indicates that you are in the Display GPS function Step 2 Press Enter The Geo will then switch to display GPS F...

Page 34: ...ng used to calculate the current position In general the more satellites the receiver can see the better the data will be The number can vary from 3 to 8 or more Press 9 again and the latitude of your...

Page 35: ...ta Release the Count Hold and begin driving When you reach an event you want to mark press the Display Hold key DH The display will freeze and a calculated GPS position see side box will be recorded a...

Page 36: ...nges to prompt you to enter the format you want to use There are three formats that can be selected by pressing either the 0 1 or 2 key The formats are 0 Degrees Decimal Minutes 40o 12 9474 1 Degrees...

Page 37: ...stance while D 2 will be used to show the In terval Distance Step 2 As you pass each reference point press the Enter key D 1 continues to show overall distance travelled while D 2 will lock on the cur...

Page 38: ...RAC Geo II User s Manual 3 26...

Page 39: ...Chapter 4 External Sensor Mode 4 1 Chapter 4 External Sensor Mode...

Page 40: ...or get under the hood You also do not have to calibrate the instrument The trade off for this benefit however is a reduction in overall accuracy The error rate of using the internal GPS sensor is app...

Page 41: ...rned on it will show GPSSen in the upper display then begin searching for GPS satellites as shown in figure 4 1 above This indicates that the unit is set to GPS sensor mode To set the RAC Geo to exter...

Page 42: ...tial problems Do not install wires near any object that could cause stray pulses to be picked up such as the alternator spark plugs or engine coil Do not install the wires or sensor near any objects t...

Page 43: ...or distance measur ing rather than the RAC Geo s internal GPS sensor install the external sensor using the instructions that came with the external sensor Installing the RAC Instrument Antenna Refer t...

Page 44: ...feet One thousand feet is ideal but the course can be any distance over 500 feet for example 623 feet from pole to tree Your course should be straight and accurate so take the time to measure the cour...

Page 45: ...indow post door handle your shoulder etc align your vehicle to the beginning course marker Step 5 Press the CH key and drive away As you drive the pulses received from the vehicle are being shown in D...

Page 46: ...have calibrated a DMI you may want to run the course a couple of times to practice being properly aligned when starting and stop ping at the course markers Important Ideally the calibration number us...

Page 47: ...as it did count If the RAC did count everything from the MDS up to the RAC is okay and the problem is most likely either a poor connection at the vehicle s speed sensor or the connection is not at th...

Page 48: ...p and Test positions four or five times Note that when the switch is turned clock wise until it stops it is at the Test position The RAC should register The count shown does not matter just as long as...

Page 49: ...ing with that vehicle The following procedure assumes the calibration number for a particular vehicle has already been determined and is stored in memory Step 1 Slide the ON OFF switch to ON The RAC G...

Page 50: ...ation number for the vehicle selected Step 5 Press Enter to return to the initial menu screen then press Enter again to exit the menu function The new vehicle number and or calibration number is store...

Page 51: ...Chapter 5 Troubleshooting 5 1 Chapter 5 Troubleshooting...

Page 52: ...y a problem with the interface sensor or wiring Check the following 1 Ensure the RAC has a calibration number in memory The RAC will not count if there is not a number in memory As you switch on the R...

Page 53: ...g processed by the RAC The Tap Test is performed using the rotary switch on the MDS First make sure you note the current position of the rotary switch 1 2 4 8 16 32 or 64 as you will have to return it...

Page 54: ...possible causes for this 1 You may have a loose or bad connection Double check all connec tions at the distance sensor and RAC to make sure they are tight and at the correct locations If you are using...

Page 55: ...Appendix A 1 Appendix...

Page 56: ...ate a report showing the data collected in the field You can also save the data in a variety of standard formats Excel spreadsheet Access database comma delimited text file so that you can work with t...

Page 57: ...t Hold Stops accumulation of distance Display Hold Freezes display without loss of distance Pre distance Capability of starting at known distance or Add Subtract desired distance value from current di...

Page 58: ...al sensor Page 4 6 CLR Clear red button on the RAC that resets the distance or time to zero Page 3 6 CH Count Hold red button on the RAC which stops the computation of distance pulses Page 3 4 DH Disp...

Page 59: ...lses are sent to the RAC from an external sensor They can vary from 4 000 to more than 100 000 per mile Page 4 8 P Dis Pre Distance menu function of the RAC it allows you to enter a known distance int...

Page 60: ..._____________ Cal Factor _________________ Veh Odometer _______________ User Initials ________________ We are pleased that you have chosen the RAC Geo II for your distance measuring needs We have stri...

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