OPERATING INSTRUCTIONS MODEL DT-31K
KEYBOARD CONFIGURATION
POWER
ON
DIGATRON MODEL DT-31
TACH
MODE
RECALL
MAXIMUM
STORE
POWER OFF
SET LIMITS
CLEAR
MEMORY
RECALL
POWER ON
When turned on, your instrument will begin a 10 second
display test. At the end of the test, your instrument’s serial
number will be displayed.
To bypass this test press the
MODE
button.
SETTING FUNCTION LIMITS
Before using your DT-31K, be sure to set the operating limits
for each sensor.
The instrument will not allow limits to be
set while the engine is running
. This is to prevent possible
damage to your instrument.
Limits allow the instrument to give you a visual warning if
any of the inputs exceed their limit.
Limits should be set at
levels that allow you to react to the visual warning before
engine damage occurs.
You will also need to set a calibration
number so the instrument can display the correct RPM.
To set the limits, the instrument must be turned on and the
kart’s engine turned off. Press and hold the
MAXIMUM
RECALL
and
MEMORY RECALL
buttons simultaneously
until the display flashes. This will put the instrument into the
Set Limits mode of operation, which is indicated by the
display flashing. To increase the limit, press the
MAXIMUM
RECALL
button. To decrease the limit, press the
MEMORY
RECALL
button. To increase or decrease the limit by a large
amount, press and hold either the
MAXIMUM RECALL
or
the
MEMORY RECALL
button until the approximate limit
value is reached. When finished setting the tach limit, press
the
MODE
button to set the next limit. Repeat the above
procedure to set the remaining limits. Set limits at levels high
enough for normal operation, but not so high that engine
damage can occur before you can respond to a problem.
The tach limit requires the setting of two separate
parameters. The first is the maximum RPM for safe engine
operation. The second number is for tach calibration. In order
to display the correct RPM for different engine types, the
instrument divides the tach input signal by the tach
calibration number. This number can be between .5 and 31.
Select this number so that it will provide the correct display
for your application using the
MAXIMUM RECALL
and
MEMORY RECALL
buttons.
The most frequently used numbers are:
.5 - for some single cylinder 4 cycle motors
1 - for single cylinder 2 cycle and some 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. Alternately, if the
RPM displayed is half of the correct value, decrease the
calibration number to half of the current number.
To save the current limits and exit the Set Limits mode, press
the
STORE
button or switch.
TACHOMETER
The tach displays RPM in thousands of RPM.
For example, if your display shows 9.50, your RPM is 9500
RPM.
STORING DATA
The
STORE
button or the optional
REMOTE STORE
switch can be pressed up to three different times to store the
current value into memory. The display and the optional
WARNING INDICATOR LIGHT
will flash to indicate a
successful store of information. After three sets of numbers
are stored, additional attempts to store information will be
ignored. In addition, the instrument automatically stores a
maximum value during the current recording period.
MEMORY RECALL
The
MEMORY RECALL
button is used to recall the
numbers stored in memory. To recall the first set of stored
numbers, press and release the
MEMORY RECALL
button.
The contents of the first memory will be displayed and the
left decimal point will flash. Press
MEMORY RECALL
again
to display the second set of information. The middle decimal
point in the window will flash. A third press of
MEMORY
RECALL
will bring up the last set of numbers and cause the
right decimal point to flash. Press
MEMORY RECALL
once
more to return to normal display mode.
MAXIMUM RECALL
The
MAXIMUM RECALL
button is used to display the
maximum value recorded. Recording of this value takes place
automatically and requires no input from the user. To display
the maximum, hold down the
MAXIMUM RECALL
button.
This value will be displayed until the button is released.
DISPLAY OF OVER LIMIT/OVER RANGE
When conditions exceed the set limit, the display will flash.
When conditions exceed the range of the instrument, three
bars will show at the top of the display. This condition can
also be caused by a bad or disconnected sensor.
