5
About Delay Time (Optional, for Racing)
Some sanctioning bodies do not allow racers to use infrared beacon transmitters and receivers. If
this is true for you, set your delay time to .1 seconds seconds.
The delay time allows your instrument to ignore extra beacon signals at the track. Delay time is the time,
in tenths of a second, that your instrument ignores beacon signals after receiving a signal. The delay time
must be less than your best possible time between beacons, or the instrument will miss your beacon signal.
Delay time is set in Set Up mode.
For example, if it takes you approximately 14 seconds to complete a run, set your delay number for 12
seconds. After your instrument receives its first beacon signal, it will ignore all signals for 12 seconds.
*Note: If you are not a racer, set your delay time to .1 seconds.
Tach Calibration Number
The Tach limit requires two separate parameters. The first is the maximum revolutions per minute (RPM)
for safe engine operation. The second number, the Tach calibration, allows the instrument to display the
correct RPM for your engine. The instrument divides the Tach input signal by the Tach calibration
number. This number can be between .5 and 31.
The most frequently used numbers are:
1 - for single cylinder 2 cycle and most 4 cycle motors
2 - for 2 cylinder 2 cycle and 4 cylinder 4 cycle motors
If you are unsure of the exact Tach calibration number for your engine, experiment. If your calibration
number is currently set at 1 and the RPM displayed is double what it should be, set the calibration number
to 2.
Recording
The instrument records in sessions called Events (shown by an E), which start each time the instrument
begins recording. Within Events, time segments (Laps, L on the display) are created with infrared beacon
receivers and transmitters or with a store switch. To end an Event your engine must be turned off, the Exit
button must be pressed, or the Tach must go below 200 RPM (this value can be changed on your PC).
Moisture
Your instrument is designed to be water resistant. We recommend keeping it as dry as possible. Please
cover or remove your instrument before washing your vehicle. Digatron offers tach bags to help keep the
instrument dry. If moisture does get inside the instrument, remove one endcap and let the instrument air
out in a dry environment. A hairdryer, on low power, can accelerate drying.
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