Digatron DT-40K Instruction Manual Download Page 21

Fig. 9

Display showing possible annunciators

19

Troubleshooting

The following are explanations to some commonly asked questions.

What are those letters on the side of my display?

There are five annunciators that may be displayed on the left side of your display. 
(see Fig. 9) The most common ones represent the engine function being displayed 
at that time:

CHT 

stands for Cylinder Head Temperature

EGT

 stands for Exhaust Gas Temperature

RPM

 stands for Revolutions per Minute, also called Tach

There are a couple other annunciators that do not stand for engine functions.
PRS stands for PReviouSly recorded data and signifies that the instrument is in 
either Laps or Playback mode. 
ERR stands for Error and could mean that your instrument has encountered 
extreme electrical interference. This can ruin the recorded information and possibly 
cause the instrument to reprogram it’s limits and calibration values. 

Why am I getting no lap times or intermittent lap times?

1. Tach Signal: Make sure your Tach sensor is properly installed and picking up

a strong signal. If it is not, spiral the colored wire down the spark plug wire. 

2. Short or no lap times are often caused by beacon transmitter problems. Make

sure the beacon transmitter is turned on and that the batteries are not low. 

• Make sure the beacon transmitter is still on the track. 
• If these do not resolve your problem, read the section about transmitters on

pages 13-14.

3. Check that the last number set in Set Limits (Appendix B) is an appropriate

number for this track. This number is the minimum time (in seconds) for you
to complete a lap. During this time, the instrument will ignore multiple beacon 
signals. After the number of seconds has passed the instrument will register
the next beacon signal it receives and then begins ignoring again. The instrument
will record inaccurate lap times if this number is set higher than the lap time
for the current track.

• Make sure the instrument’s batteries are not low.
• Review page 6 for information about how the instrument begins recording.

Summary of Contents for DT-40K

Page 1: ...ENGINE MONITORING SYSTEMS DT 40K INSTRUCTION MANUAL...

Page 2: ...t Lap and Event Number and Clear Memory 7 Analyze Data 8 Lap Times and Maximums 8 Detailed Review of a Lap 9 Power Off 9 Appendix A Sensor Installation 10 Tach Sensor 10 CHT Sensor 12 EGT Sensor 12 Be...

Page 3: ...sed it can monitor any combination of the following functions cylinder head temperature CHT or water temperature WT exhaust gas temperature EGT and tachometer Tach It datalogs all of these inputs alon...

Page 4: ...utor or magneto Sensor cables too close to these components may pick up radiated electrical interference and cause erratic instrument readings and operation A distance of at least 6 from these compone...

Page 5: ...ts and calibration to reprogram themselves If your instrument is doing strange things put it in Set Limits and check to see that the limits and calibration are still where you set them see Appendix B...

Page 6: ...tion To change the display resolution press the and the buttons at the same time High Resolution Highest number displayed is 1 59 9 After that time the instrument continues to record and the 1 on the...

Page 7: ...iously recorded data Change Function Displayed Press the Function button to change what is being displayed It cycles through the functions in this order CHT WT EGT RPM Lap and Lap Time Not all instrum...

Page 8: ...ill register the next beacon signal it receives and then begin ignoring again When you finish a lap while the instrument is recording it will display the total time for the last lap for three seconds...

Page 9: ...en again exceeds the limit the instrument will again display and flash the over limit function Reset Lap and Event Number and Clear Memory To reset the lap and event number to zero and clear all recor...

Page 10: ...ess the or button to change the lap number being displayed If you are viewing the last lap of an Event the button moves you to the first lap of the next Event If you are at the first lap of an Event t...

Page 11: ...als Change Function Press the Function button to view the different functions readings for this lap Max Readings Press the Max Event button to review the maximum readings for each function the current...

Page 12: ...cable from the motor to your instrument securing with cable ties Plug into the pigtail with the small push on type connector Four cycle engines The Tach sensor is a small antennae that picks up the en...

Page 13: ...Fig 1a Example of standard installation Fig 1b Example of Briggs installation 11 Standard Inductive Tach Sensor Installation Low Energy Ignition Inductive Tach Sensor Installation Briggs...

Page 14: ...16 hole through the header Remove the clamp assembly from the header and redrill the hole to 13 64 Reinstall the clamp assembly and align it with the hole just drilled Insert the sensor into the fitt...

Page 15: ...ng the red lens from the sun Other racers will rarely interfere with the beacon signal but mounting the receiver as high as practical will help to avoid that situation Attach the receiver to your vehi...

Page 16: ...mbs reach of the driver This switch requires a 15 32 mounting hole for installation Mount the switch in a position that will provide easy access while driving Tie the coil cord to the steering column...

Page 17: ...set in the following order CHT WT EGT Tach and Tach calibration number and minimum lap time If you do not have all of these functions it will also set limits in this order minus the function s you ar...

Page 18: ...ally run between 1100 F and 1350 F The EGT on a properly tuned engine will increase rapidly as the throttle is opened and as the load on the engine is increased At full throttle and full load the EGT...

Page 19: ...rse direction Pg 9 2 Set Limits Button not used Monitor Record Instrument enters Lap Max and displays Lap Pg 8 Laps Instrument enters Playback and begins reviewing data for the selected lap Pg 9 Playb...

Page 20: ...Pg 8 Playback Changes the function playing back in this order CHT WT EGT Tach Lap and Lap Time Pg 9 6 Set Limits Button not used Monitor Record Displays the maximum value for each engine function sinc...

Page 21: ...getting no lap times or intermittent lap times 1 Tach Signal Make sure your Tach sensor is properly installed and picking up a strong signal If it is not spiral the colored wire down the spark plug wi...

Page 22: ...lon flashing This signifies that the clock is running either during record or playback Why is the Display Flashing This signifies that you are either in Set Limits or that your engine exceeded a set l...

Page 23: ...the warranty Be sure to fill out and return your warranty card for our records If we do not have a card on file for your instrument you will be charged for repairs unless you can provide us with proof...

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