Vaisala TCI101 NiteStar - Manual (Page 5)

Prints data to the RS-232 output and updates INTERVAL.
If the RS-232 option is available the DMI will output...
Event # Distance Interval Speed <Return>
1. 12345 0 35
2. 12445 100 37
... each time MARK/ENTR or PRINT key is depressed
See Calibration Section
Changes distance units on display each time the key is
pressed. Units are: FEET, MILES and KILOMETERS.
Allows entry of a specific starting distance (pre-distance)
other than 0 Feet, Miles or KM. To set a specific
starting distance, clear the DMI before entering distance,
press 3PD, enter distance, then press MARK/ENTER.
The number entered can also be added to the current
distance displayed. For example, if the current distance
displayed is 100 Feet and a number of 30 is entered,
then the displayed distance will be 130 Feet.
Toggles the DMI between counting DOWN and UP. The
count direction is DOWN if the DN arrow is shown to the
left of the distance. If DN is NOT shown the unit is
counting UP. NOTE: When the DMI is counting DOWN
and reaches 0 it beeps and begins counting UP again.
Press to adjust the backlight brightness level. There are
three light levels and "off". The backlight consumes
power. Do not leave the backlight on when the vehicle
will not be in use for an extended period or the vehicle
battery could become depleted.
6
( same as MARK/ENTER key)
Changes the SPEED units displayed each time the key is
pressed. Units: Feet/Second -- Miles/Hour -- Kilos/Hour
See PDI Section
See Access to Memory Programs Section
See Memory Section
– IMPORTANT –
Your new Nitestar will be factory programmed with a calibration
number of 1000. This value should remain in the Nitestar until the
proper calibration procedure is completed as outlined in this man-
ual. If 1000 is not programmed in, manually type in “1000” and
press the MARK/ENTER key.
CALIBRATION OVERVIEW
The DMI works by counting pulses that are received from the sen-
sor. The number of pulses is different for each vehicle, so the
DMI must be calibrated for each vehicle.
The calibration number you find for your vehicle will be the num-
ber of feet the vehicle travels between each pulse multiplied by
1000. This number should be between 400 and 1400. If the
number is outside this range the accuracy of the DMI may be
adversely affected.
PRE-CALIBRATION PROCEDURE
1. Accurately measure a straight road course 1000’ long using a
tape measure or similar device. Mark the beginning and end with
a paint mark, stake in the ground, or other fixed object.
2. Check the air pressure in the vehicle tires. Make note of the
pressure and recheck each day before beginning use of the DMI.
3. Drive the vehicle for approximately 5 miles before running the
calibration course. This will help to match the same operating
temperatures that the tires will have during normal use.
7