micro-trak Calc-An-Acre II User manual

2
111 LeRay Avenue
Eagle Lake, MN 56024-9650
Copyright © 2021 Micro-Trak Systems, Inc.
All rights reserved.
Calc-An-Acre II is an electronic monitor for speed, area worked, distance and shaft RPM. Calc-An-Acre II has been designed for
easy installation and operation. However, since each installation will vary depending on your equipment, please take time to
familiarize yourself with this manual and the actual components before beginning. Following the procedures described in this
manual will ensure proper performance and help avoid problems or questions once you are in the field.
This manual is written for the Calc-An-Acre II, which may be used for English, Metric or Turf measurement. Please read the
manual carefully and follow the instructions as they apply to your usage.
If you do encounter a problem that cannot be corrected by reviewing this manual, consult your dealer or distributor, or contact
a Micro-Trak technician for assistance.
Toll Free in U.S. or Canada: [phone] or [phone]
Fax: [phone]
E-mail: [email protected]
Web: www.micro-trak.com
REFERENCE MANUAL
Speed, Area, Distance and RPM Monitor

3
Micro-Trak Systems, Inc.
Limited Warranty Statement
Micro-Trak Systems, Inc. (herein “Seller”) warrants to the original purchaser (herein “Buyer”) that, if any product or part of the prod-
uct (herein “Parts”) proves to be defective in material or workmanship, upon inspection and examination by Seller, within three (3)
years from the original date-of-purchase, and is returned to Seller with dated proof-of-purchase, transportation prepaid, within
sixty (60) days after such defect is discovered, Seller will, at their option and sole discretion, either repair or replace said part, except
that the warranty for expendable Parts, including but not limited to, light bulbs, batteries, hose and tubing, nuts, bolts, screws and
other fasteners shall be thirty (30) days from the original date-of-purchase; and except that the warranty for Parts manufactured by
someone other than the Seller, including but not limited to, shut-o valves, control (servo) valves, owmeters, pressure sensors and
regulators, pumps, motors, compressors, tanks and tank accessories, DGPS receivers and related repeater and base stations shall be
one (1) year from the original date-of-purchase; and except that the warranty for Parts manufactured by someone other than the
Seller, including but not limited to, memory cards and drives, mapping software, terminals, PC’s, laptops, tablets and other com-
puter devices shall be thirty (30) days from the original date-of-purchase. Any damage or failure to said part resulting from abuse,
misuse, neglect, accidental or improper installation or maintenance, unauthorized modication, use with other parts and/or prod-
ucts, or attributable to acts of God, as determined solely by the Seller, will invalidate the warranty. Said part will not be considered
defective if it substantially fullls the performance specication. Buyer shall be responsible for all maintenance services, if any, all in
strict accordance with the procedures outlined in the manual. The warranty does not include labor, installation, replacement parts
or repairs, delivery of replacement parts or repairs or time and travel. Said warranty is non-transferable.
THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES OF MERCHANTABILITY, FITNESS FOR PURPOSE
AND OF ANY OTHER TYPE, WHETHER EXPRESS OR IMPLIED. THE SELLER’S LIABILITY, WHETHER IN CONTRACT, IN TORT, UNDER
ANY WARRANTY, IN NEGLIGENCE OR OTHERWISE, SHALL NOT EXCEED THE RETURN OF THE AMOUNT OF THE PURCHASE PRICE
PAID BY THE BUYER, AND UNDER NO CIRCUMSTANCES SHALL THE SELLER BE LIABLE FOR SPECIAL, INDIRECT, CONSEQUENTIAL,
INCIDENTAL OR PUNITIVE DAMAGES. SELLER NEITHER ASSUMES NOR AUTHORIZES ANYONE TO ASSUME FOR IT ANY OTHER
OBLIGATION OR LIABILITY IN CONNECTION WITH SAID PART. NO ACTION, REGARDLESS OF FORM, ARISING OUT OF THE TRANS
ACTIONS UNDER THIS AGREEMENT MAY BE BROUGHT MORE THAN ONE 1 YEAR AFTER THE CAUSE OF ACTION HAS OCCURRED.
Buyer accepts these warranty terms and limitations unless the part is returned to Seller, via proper distribution channels and ap-
proved return authorization, with dated proof-of-purchase, transportation prepaid, within sixty (60) days from the date-of-purchase
for refund of the purchase price.
Source Doc: MTS Warranty Statement 080120
At Micro-Trak® Systems, we believe a product that delivers quality and performance at a reasonable cost is what is needed to help
today’s operator and the operator of the future compete in the world market.
It is our goal to provide operators with a line of electronic equipment that will help build and maintain an efficient and profitable
operation that can be passed on to future generations.
We thank you for your purchase and hope that we can be of service to you in the future.
Micro-Trak® Systems, Inc.
MAIL and UPS:
Micro-Trak® Systems, Inc.
ATTN: Service Department
111 LeRay Avenue
Eagle Lake, MN 56024-9650

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Table of Contents
Micro-Trak Warranty.............................................................................................................................................................................3
Table of Contents ..................................................................................................................................................................................4
Component Parts and Assembly Hardware.....................................................................................................................................5
Wiring Diagram......................................................................................................................................................................................6
System Overview...................................................................................................................................................................................7
Installation..............................................................................................................................................................................................7
Console Mounting ..................................................................................................................................................................................................7
Electrical Installation ..............................................................................................................................................................................................8
Speed Sensor Options ...........................................................................................................................................................................................9
Astro Speed Sensor Installation .........................................................................................................................................................................9
Magnetic Speed Sensor Installation.............................................................................................................................................................. 10
Optional Remote Run/Hold Kit Installation................................................................................................................................................ 11
Optional Shaft RPM..............................................................................................................................................................................................12
Calc-An-Acre II Console Functions...................................................................................................................................................13
Calibration ............................................................................................................................................................................................14
English/Metric Selection.................................................................................................................................................................................... 14
Entering Calibration Values ..............................................................................................................................................................................15
Fine Tuning Speed/Distance Cal.....................................................................................................................................................................17
Operation..............................................................................................................................................................................................18
General .....................................................................................................................................................................................................................19
Width Reduction: On-The-Go .........................................................................................................................................................................19
Rotary Switch Positions......................................................................................................................................................................................19
Resetting System Counters............................................................................................................................................................................... 20
Troubleshooting..................................................................................................................................................................................20
Messages/Warnings.............................................................................................................................................................................................20
General .....................................................................................................................................................................................................................21
Checking Individual Components..................................................................................................................................................................22
Checking Console Inputs................................................................................................................................................................................... 23
Appendices...........................................................................................................................................................................................24
Appendix A - Optional Speed Sensor Mounting Installation............................................................................................................... 25
Optional Speed Sensor Mounting Installation on Drive Shaft .................................................................................26
Appendix B - Radar “Y” Adapter Cables....................................................................................................................................................... 27
Appendix C - Conversion Chart.......................................................................................................................................................................28
Appendix D - Replacement Parts ...................................................................................................................................................................29

5
(2)
(2)
(2)
(2)
(2)
(2)
(2)
Component Parts and Assembly Hardware
Before beginning installation, check the carton contents for the following items:
Owner’s Manual
P/N 17192 Console Mount Kit
P/N 13181
Calc-An-Acre II Console
P/N 17185
Power/Speed/Run-Hold/RPM Harness
P/N 17176
10’ 3-Pin Extension Cable
M/P 150 P/N 13206
Speed sensor mounting bracket
P/N 10013
Magnets (6) P/N 12069
(2 add’l in hardware bag)
14” Nylon cable ties (10)
Kit P/N 12910
Hardware Bag
P/N 13251
5’ Hall-effect Speed/Flow
Sensor Cable P/N 13096
Speed Sensor Kit P/N 01530
Note: Calc-An-Acre II “Customized” kit P/N 01001 does not include the P/N 01530 Speed Sensor kit shown below.

6
RPM SIGNAL RPM POWER SPEED POWER SPEED SIGNAL SPEED GROUND RUN/HOLD POWER RUN/HOLD SIGNAL RUN/HOLD GROUND BATTERY GROUND BATTERY POWER
BRN
RED
ORG
YEL
GRN
BLU
VIO
GRY
WHT
BLK
18”
RED
WHT WHT
RED
BLK
WHT
RED
BLK BLK
RED
A B C D E F G H J K
A B C D E F G H J K
10-PIN METRI-PACK 150 TOWER
10-PIN METRI-PACK 150 SHROUD
P/N 17176
9”
A B C
3-PIN M-P 150TOWER
A B C
3-PIN M-P 150 SHROUD
DUST COVER
3-PIN M-P 150 TOWER
A B C
YELLOW TIE
SPEED
RPM
A
B
C
RUN/HOLD
3-PIN M-P 150 SHROUD
GND
+12V
GRAY TIE
A B C
3-PIN M-P 150 TOWER
120”
24”
120”
Calc-N-Acre II
Console
Calc-An-Acre II Wiring Diagram

7
Drill ¼” (7mm)
holes for bolts,
or 3/16“ (5mm)
holes for self-
tapping screws.
Bolts
Lockwashers
and nuts
Installation
Console Mounting
Select a practical mounting location, convenient to reach
and easily visible to the operator. DO NOT INSTALL IN A
POSITION THAT OBSTRUCTS THE VIEW OF THE ROAD
OR WORK AREA. Whenever possible, avoid locations that
expose the console to direct sunlight, high temperature,
strong chemicals or rain. Console may be mounted to
horizontal or vertical surface - adjust tilt for best visibility.
Place the mounting bracket in selected location, mark holes,
drill 1/4” (7mm) holes and mount bracket with bolts, lock-
washers and nuts provided.
(Use self-tapping screws if not practical to use bolts.)
YELLOW TIE
GRAY TIE
DUST COVER
RPM
GND
+ VES
RUN/HOLD
SPEE
D
(RED)
(BLACK)
Calc-An-Acre II System Overview
Put rubber washers on carriage bolts and put the bolts
through the bracket holes from the inside out. Loosely
attach the mount knobs onto the bolts. Place console
over carriage bolt heads and tighten knobs to secure the
console.
Rubber washer
Carriage bolts
Mount knob
Console Mounting Detail
Console Bracket

8
Installation (cont.)
Electrical Installation
This section explains how to hook-up your Calc-An-Acre II to a 12VDC power connection.
The Calc-An-Acre II must be connected to a 12VDC negative ground electrical system.
ROUTING HARNESS AND CABLING
Avoid areas where the cable may be subjected to abrasion or excessive heat.
POWER CONNECTION
Locate the power cable lead on the Calc-An-Acre II harness and route to a switched +12VDC source. Attach the BLACK wire
to ground. Connect the RED wire to positive terminal. If using an unprotected circuit as +12VDC source, add a 2A inline fuse
(not included in kit.)
Alternately, the Calc-An-Acre II can be powered directly from the battery along with a power switch (not included in kit.)
Note: Ensure clean metal-to-metal contact from wiring to terminals.
Calc-An-Acre II is equipped with a non-volatile memory which does not require a constant supply of power to retain daily
totals or calibration values.
WIRING HARNESS ORIENTATION
Wiring with multiple branches must be installed so that the individual wires point downward, as shown. This will protect the
internal connections from exposure to liquid chemicals.
WRONG RIGHT
Example of power connection to switched ignition source
Black to Ground
Attach RED wire to
terminal or lead that is
“hot”
with ignition on.
2-amp in-line fuse required (Not Provided) for unprotected circuits
FUSEHOLDER

9
The Calc-An-Acre II must be connected to a speed sensor to utilize its calculating function.
Several possible options are listed below:
ASTRO SERIES OR OTHER GPS SPEED SENSOR INTERFACES
The Calc-An-Acre II is designed to easily connect to the Micro-Trak Astro series speed sensor. It also may be used with most
GPS speed sensors that output a pulsed signal, such as the Squibb-Taylor®SkyTrak or Dickey-John®GPS speed sensors. An
adapter cable may be required.
MAGNETIC WHEEL SENSOR
This system uses magnets attached to a wheel hub or drive shaft and a hall-effect sensor. The movement of the magnets
near the sensor creates an electrical pulse which the console uses as a speed input. The system must be carefully calibrated
to ensure accurate readings.
VANSCO™RADAR SPEED SENSOR AVAILABLE FROM MICROTRAK DEALERS & DISTRIBUTORS
The Vansco radar speed sensor uses a microwave (radar) signal to deliver a reliable, accurate speed signal for electronic
equipment. It features state-of-the-art electronic design/manufacturing, rugged aluminum housing and complete testing
and certification.
RADAR INTERFACE
The Calc-An-Acre II may also be interfaced with most popular radar ground speed sensors. An adapter cable is required for
proper interface.
SEE Appendix B FOR LIST OF ADAPTER CABLES FOR RADAR.
PROXIMITY SENSOR  P/N 01554
The proximity sensor is useful in situations where it is impractical or inadvisable to
use other options. The P/N 01554 Proximity Sensor responds to the close presence of
ferrous metals and sends a signal to the console via Speed connection. Typically it is
mounted near the teeth of sprocket using a recommended air gap of 1/16” (tip: use a
U.S. dime as a gauge).
To calibrate the system to use this sensor for speed use pg. 18 Fine Tuning Speed/
Distance.
Installation (cont.)
Speed Sensor Options
Astro Speed Sensor Installation
RECEIVER: The GPS receiver may be mounted either externally (roof of the cab or other place
with a clear view of the sky) or inside the vehicle cab. However, if mounted inside the cab
there may be some loss of accuracy due to blockage of satellite signals. For most reliable
operation, mount the GPS receiver in a location where it has an unobstructed view of the sky.
Mount the receiver using the integral magnet or the included self-adhesive fastener tape. If
using the fastener tape - clean the mounting location, remove the plastic backing, and press
firmly to the surface.
WIRING: Route the 10 foot cable from the receiver into the cab (if receiver is externally
mounted). Avoid sharp edges or heat sources. The rectangular module is roughly the same
size as the connector and will fit through the same opening.
MODULE: The small potted module includes a power LED and a GPS status LED. The module can be mounted in a visible
location using the included self-adhesive fastener tape, or placed out of sight.
• Power LED (closest to connector) : On when 12VDC is connected
• GPS Status LED (closest to receiver): Flashes when the GPS receiver is active and scanning for a satellite. When a signal is found, it will
remain on. If the GPS system fails, the light will turn off.
CONSOLE CONNECTION: Connect the short cable from the Astro to the 3-pin connector labeled SPEED on your console.

10
Installation (cont)
Magnetic Speed Sensor Installation
Magnet Polarity
South
North
Magnet Layout
North
North
North
South
South
South
1
2
43
5
6
Test magnet
should alternately
attract and repel.
Magnet Locations
1. Non-driven wheel on tractor, vehicle or implement - less
susceptible to errors resulting from wheel slip.
2. Tractor, vehicle or planter drive shaft. This type of mounting
is recommended for trucks, four-wheel drive tractors or other
equipment that has limited access to a non-driven wheel.
Number of Magnets
The number of magnets that must be used depends on the size of
your tire and where you mount the sensor. On tractor or implement
wheels the general rule of thumb is one magnet for each wheel bolt
(minimum of two, and always an even number). For drive shafts or
small wheels (ATV’s), two magnets are usually adequate.
Some installations may require that more than two magnets be
installed. To determine the number of magnets required, measure
the distance traveled of one revolution of the sensor equipped
wheel in inches (meters). Divide that measurement by 20 for English
and Turf units, or by .5 for Metric units, and then round up to the
nearest even number (always use an even number of magnets). That
number will be the minimum number of magnets required for the
installation.
Example in English/Turf units: If your revolution measurement is
97 inches, dividing that number by 20 gives you a value of 4.85.
Rounding 4.85 up to the nearest even number is 6. For this example,
the minimum number of magnets required is 6.
Example in Metric units: If your revolution measurement is 2.5
meters, dividing that number by .5 gives you a value of 5. Rounding
5 up to the nearest even number is 6. For this example, the minimum
number of magnets required is 6.
The magnets provided by Micro-Trak® are marked with a punched
dashed line on the SOUTH pole side of the magnet.
Always use an even number of magnets, and always alternate the
polarities of the magnets as you go around the wheel hub or drive
shaft.
To install, mount the first magnet with the SOUTH pole side (dashed
line) facing toward the hub or shaft. Mount the second magnet with
the NORTH pole side facing toward the hub or shaft.
For proper operation, the magnets must be evenly spaced around
the wheel or drive shaft. The magnets must be at least 1” apart.
Locate the Following Parts
• Speed Sensor Cable (Green Body)
• Mounting “L” Bracket
• Magnets
• Cable Ties
NOTE: Magnets may be attached mechanically or adhered
with epoxy or other high quality adhesive. When using
adhesive, thoroughly clean the area of dirt and oil.
Attaching Magnets
The magnets are attached to a wheel hub or drive shaft and the
speed sensor is mounted directly over the magnet. When the wheel
or drive shaft begins turning, a speed impulse is sent to the Calc-
An-Acre II console every time a magnet passes by the tip of the
speed sensor. For the speed sensor to operate properly, the spacing
between the magnets and the tip of the sensor must always remain
constant. Before permanently mounting any parts, be sure that the
location you have selected will meet the following requirements.
NOTE: Magnets must alternate in polarity. Mounting Detail
45° max
Sensor
(Green body)
Magnet
3/8” nuts
Bracket must
be rigidly
mounted
Sensor assembly must not
be mounted more than
45° from perpendicular
¼” to ½” air gap
Magnet Spacing
1” Minimum

11
Connecting the Speed Sensor Cable
The speed sensor cable has a GREEN sensor body and joins the 3-pin connector which is marked with a YELLOW cable tie.
The optional Run/Hold and RPM sensors are identical, and use the same type of connector as the speed sensor.
The Run/Hold sensor body is BLACK and connects the main harness cable with a GRAY tie near the 3-pin connector.
The RPM sensor body is BLACK and connects to the main harness 3-pin connector with no color tie.
See Calc-An-Acre II Wiring Diagram on page 6.
SENSOR IDENTIFICATION CHART
SENSOR SENSOR BODY COLOR MAIN HARNESS TIE COLOR
Speed Green Yellow
RPM Black None
Run/Hold Black Gray
Installation (cont)
Magnetic Speed Sensor Installation
Lift Wheel Mounting
Sensor (Black body)
1/8” to 3/8”
(6 mm to 13 mm)
when wheels are up
Magnet
South
North
Hydraulic Cylinder Mounting
Remote Run sensor on hydraulic cylinder. Magnet
and sensor are in line when equipment is lowered and
operating.
The run/hold sensor cable has a BLACK body and mates
with the main harness cable having a GRAY cable tie near
the 3-pin M/P connector. Make certain that you install the
correct sensor cable and connect it to the correct connector
on the main harness.
IMPORTANT
If not using Run/Hold cable for remote use, make certain a
dust cover with jumper is installed.
• Attach a magnet to a lever or some part of the
equipment that moves when the implement is raised
and lowered. The Hall-effect Run/Hold sensor is
sensitive ONLY to the south pole of the magnet. Install
the magnet with the dashed line facing the sensor.
When the magnet is away from the sensor, the console
will be in HOLD and the area and distance counting
functions will be disabled.
NOTE: The run/hold kit includes a 5’ sensor cable
and 10’ extension. You may require additional
extension cables which are available in 5 ft. (1.5
m), 10 ft. (3 m), 15 ft. (4.5 m), 20 ft. (6 m) and 25 ft.
(7.6 m) lengths.
• You may also use a toggle or other type switch. Simply
cut the black jumper wire in the dust cover and splice
on an appropriate length of wire to reach your switch.
DO NOT connect to a switch with power.
When switch is closed, console is in RUN. When the switch is
open, the console is in HOLD.
Remote Run/Hold Installation (Requires Optional Kit # 01535)
Run
Position Hold
Position
Sensor
(Black body)
Magnet
North
South
P/N 01535 Remote Run/Hold Kit
Includes items:
P/N 13226 5’ Run/Hold Sensor Cable
P/N 13206 M/P 150 10’ Extension Cable
P/N 13251 Hardware Bag (incl. magnets)
P/N 10045 14” Nylon cable ties (5)
P/N 10013 Speed Sensor Mounting Bracket

12
45° max
Sensor
(green body)
Magnet
3/8” nuts
Bracket must
be rigidly
mounted
Sensor assembly must not
be mounted more than
45° from perpendicular
¼” to ½” air gap
S
S
Plastic Cable Tie
Shaft
NOTE: Magnets can be placed closer than 1” apart if a
magnet with opposite polarity is placed between them.
South South
1 2
1” minimum
Locate the following parts (in optional kit #01539):
• P/N 13226 Shaft sensor cable (black body)
• P/N 13251 Magnets (and hardware)
• P/N 10045 2 Cable ties
• P/N 10013 Bracket
Mount magnet with SOUTH pole (dashed line) facing tip
of sensor. Some installations may require more than one
magnet per shaft. The magnets provided by Micro-Trak
are marked with a dashed line on the SOUTH pole side of
the magnet.
INSTALLATION: For proper operation, the magnets must
be evenly spaced around the shaft. The magnets must be
at least 1” apart.
NOTE: magnets may be attached with a cable tie or
adhered with epoxy or other high quality adhesive.
When using adhesive, thoroughly clean the area of
dirt and oil. Use of cable ties or other mechanical
attachment is recommended, however.
The shaft sensor is mounted directly over the magnet. For
the shaft sensor to operate properly, the spacing between
the magnets and the tip of the sensor must always remain
constant. Before permanently mounting any parts, be
sure that the location you have selected will meet the
mounting requirements. Note that magnets can be
closer than 1” apart only if another magnet with opposite
polarity is mounted between each of the south-faced
magnets. NOTE: Observe magnet polarities.
Installation (cont)
Shaft RPM (Requires Kit # 01539)
P/N 01539 RPM Sensor Kit
Includes items:
P/N 13226 5’ Run/Hold Sensor Cable
P/N 13251 Hardware Bag (incl. magnets)
P/N 10045 14” Nylon cable ties (5)
P/N 10013 Speed Sensor Mounting Bracket
South
North
Magnet Polarity
Magnet Layout
Mounting Detail

13
Calc-An-Acre II Console Functions
The Calc-An-Acre II features a large, easy-to-read liquid crystal display, easy-to-use rotary dial and
lighted display.
SUB HOURS: Shows sub
hours of operation (can be
reset).
SHAFT CAL: Used in calibration mode to enter shaft pulses
per revolution (for RPM readout)
TOTAL HOURS: Shows
hours of operation (can be
reset).
DISTANCE: Displays distance traveled
in feet (meters). May be reset.
WIDTH +/: Displays effective working
width. Width can be changed on the
go, in 25% increments.
AREA/HOUR: Displays current
work rate in acres per hour
or hectares per hour or
thousands of square feet per
hour.
WIDTH CAL: Used in calibration mode to enter the
working width of your sprayer booms or other equipment.
UNITS: Used in calibration mode to select between
English, Metric and Turf.
SPEED: Displays ground speed in
miles per hour (kilometers per hour).
SPEED CAL: Used in calibration mode to enter the speed
calibration number in inches (cm) per pulse.
AREA 1 2 3: Three independent counters keep a
running count of the total acres (hectares) (thousands of
square feet) worked. May be reset.
RPM: Displays shaft RPM (requires Shaft Sensor Kit P/N
01539)
PROGRAM KEYS:
Used to increment and decrement the
different calibration values.
• RESET when not in CAL, clears the
selected counter when held for two sec-
onds while in HOLD.
• When in CAL, or Width +/-, the “+” key
increases and the “-” decreases the value
displayed.
Key Functions:
RUN/HOLD:
Key which changes between Run and Hold
modes of operation.
CAL:
This key is used to enter & exit the calibration
mode.
Calibration Positions Calibration Positions
Care and Maintenance
of your Calc-An-Acre II
Store the console in a cool dry location if it will
not be used for an extended period of time, such
as during the off-season. As with any electronic
equipment, use care in cleaning so that water or
other liquids do not enter the case.
RUN
HOLD
CAL
RESET

14
Calibration
English or Metric?
The Calc-An-Acre II is capable of displaying information in American
English or standard Metric or Turf measurement units. The Calc-An-
Acre II is shipped from the factory programmed for English. Note
that the following procedures will also load factory default calibration
values. To simply change units without loading defaults, see the
Calibration section on next page.
METRIC
• To activate the Metric mode, turn power OFF and place the rotary
switch at “RPM.” Hold down both the “CAL” and “-” keys and turn
power ON. The console will display LOAd. Once LOAd is displayed,
release the two keys. To “lock-in” Metric mode you must enter and
exit calibration. You must be in HOLD to enter Cal. Press and hold
the CAL key until “CAL” icon appears on the display. The console
is now in calibration and Metric mode is selected. Exit CAL by
pressing and holding the “CAL” key until CAL disappears from
the display (approximately 1 second).
NOTE: you must exit CAL to lock in Metric units.
It is also possible to instantly save factory defaults during the
above procedure by pressing and holding down the “CAL” and “-”
keys for 3 seconds until the screen reads “StorE”.
ENGLISH
• To activate the English mode, turn power OFF and place the rota-
ry switch in the AREA position. Hold down both the “CAL” and
“-” keys and turn power ON. The console will display LOAd. Once
LOAd is displayed, release the two keys. To “lock-in” English
mode you must enter and exit calibration. You must be in HOLD
to enter Cal. Press and hold the CAL key until “CAL” lights on the
display. The console is now in calibration and English mode is
selected. Exit CAL by pressing and holding the “CAL” key until CAL
disappears from the display (approximately 1 second).
NOTE: you must exit CAL to lock in English units.
It is also possible to instantly save factory defaults during the
above procedure by pressing and holding down the “CAL” and “-”
keys for 3 seconds until the screen reads “StorE”.
NOTE: In metric, the width will have a decimal point, in English there
is no decimal point. Also, changing from English to Metric mode
may change or alter any previously entered calibration values. After
switching measurement modes, confirm that all calibration values
are correct.
IN ALL CALIBRATION OPERATIONS:
1. Put system in “HOLD”.
2. Press and hold the “CAL” key for 1 second to select the
calibration mode. The console display will display the
“CAL” icon, and the currently selected calibration value.
3. Turn the rotary dial to the desired “CAL” position. Then
use the “+” or “-” key to adjust the displayed value up or
down as needed. Adjust ALL necessary values. Hold the
“CAL” key again for 1 second to exit calibration. “CAL”
will disappear from the display. NOTE: You must exit
CAL to save changes.
SHAFT
CAL
SPEED
CAL
WIDTH
CAL
SPEED DISTANCE
AREA /
HOUR
TOTAL HOURS SUB HOURS
AREA
(1) (2) (3)
CAL
RUN
HOLD RESET
MANAUTO
CAL HOLD
WIDTH +/-
®
II
RPM
UNITS
Press to enter or exit
calibration mode.
Press to increase or
decrease values.
SHAFT
CAL
SPEED
CAL
WIDTH
CAL
SPEED DISTANCE
AREA /
HOUR
TOTAL HOURS SUB HOURS
AREA
(1) (2) (3)
CAL
RUN
HOLD RESET
MANAUTO
CALHOLD
1 2 3 4 5
WIDTH +/-
®
II
RPM
UNITS

15
WIDTH: Enter the effective working width, in inches (meters).
Your “working” width per boom section will be
the number of nozzles on the boom section
times the nozzle spacing in inches (mm). For
example, if you have 7
nozzles spaced at 20
inches, the working
width of the boom
section is 140 inches.
Calibration (cont)
Entering Calibration Values
RADAR OR GPS SPEED SENSOR CALIBRATION
Speed Cal for Radar or GPS Speed Sensors
See the following table for SPEED CAL numbers to enter for various radar models or GPS speed sensors.
UNITS: Choose the system of units desired. Use the “+”
and “-” buttons to choose between EnG
(American English Units), mEt (Metric) and
turF (Turf units). Turf units are the same as
English units except Area is in thousands of
square feet.
UNIT
S
SUB HOURS
WIDTH +/- WID
TH
CAL
SHAFT CAL: This position is used to calibrate a shaft RPM
sensor. A P/N 01539 Shaft RPM Sensor Kit is required. When
this position is selected,
the display will show
the SHAFT CAL value
(pulses per revolution). A
SHAFT CAL value from 1-255 may be entered
using the “+”and“-” buttons, corresponding
to the number of magnets mounted on the
Shaft. See page 10.
SHAFT
CAL
RPM
SPEED CAL: This position is used to calibrate the speed
sensor for accurate
speed and distance
measurement. When
this position is selected,
the display will show the
SPEED CAL value. See next page for details.
SPEED
CAL
DISTANCE
Radars English Cal # in. Metric Cal # in. Hz/MPH
Vansco .150 .38 58.90
Raven .148 .38 59.80
Magnavox .154 .39 57.40
Dickey-john
(NOTE: Dickey-john
radars may be factory
calibrated for any of
these four settings).
.149 .38 58.94
.199 .51 44.21
.319 .81 27.64
.518 1.32 17.034
GPS Speed
Astro II & 5 .189 .48 46.56
SkyTrak (Std) .150 .38 58.94
SkyTrak (MT) .910 2.31 9.82
Dickey-john .210 .53 42.00
John Deere (In-cab spd signal) .197 .50 44.70
Calibration Factor Measurements E󰀨ected Default Values
English Metric
WIDTH Area, Area/Hour 720 inches 18.000 meters
SPEED CAL Distance, Area, Area/Hour .189 inch/edge .48 cm/edge
RPM RPM Display 1 pulse/revolution 1 pulse/revolution
UNITS Distance, Area, Area/Hour17 English Metric
Factory-Loaded Calibration Values

16
Drive Shaft Speed Sensor Calibration
NOTE: If you have mounted the magnetic speed sensor on
a wheel, skip this step and go on to Fine Tuning Speed/
Distance Calibration Values.
Because of the difference in wheel-to-drive shaft ratios, it
is difficult to determine a calibration value for installation
on a drive shaft by measuring a wheel. You must start
with an estimated calibration value and then fine-tune the
calibration.
Any number between 10 and 15 (255 mm to 380 mm) is a
good starting value.
NOTE: For fine-tuning the SPEED CAL value, see following
page.
To determine SPEED CAL, measure the distance
of one complete wheel revolution and divide
by the number of magnets installed.
For the console to calculate the correct speed and
measure distance accurately, the circumference of the
sensor-equipped wheel must be entered. Determine the
circumference of the sensor-mounted wheel to the nearest
tenth of an inch (tenth of a centimeter) with the following
method:
METHOD
Mark the tire with a piece of chalk and measure the distance
traveled on the ground for one complete revolution. See
Illustration. For improved accuracy, it is recommended
that you perform this function in field conditions, measure
several revolutions, and take the average.
Divide the measured revolution by the number of magnets
installed to get your starting SPEED CAL calibration value.
Once calibration of the system is complete, this number
should be fine-tuned for optimum accuracy.
For fine-tuning the SPEED CAL value, see following page.
Calibration (cont)
Entering Calibration Values (cont)
Determining the SPEED CAL (Skip this section if using radar or GPS speed sensor)
DRIVE
Distance travelled in one rotation

17
SHAFT
CAL
SPEED
CAL
WIDTH
CAL
WIDTH +/-
DISTANCE
AREA /
HOUR
TOTAL HOURS
SPEED
AREA
(1) (2) (3)
CAL
RUN
HOLD RESET
SUB HOURS
®
II
RPM
UNITS
CAL
1 2 3 4 5
HOLD
Calibration (cont)
Fine Tuning Speed/Distance Calibration Value
PREPARATION
In order to achieve accurate measurements, each step in
this fine tuning procedure should be performed as precisely
as possible.
1. Once the system is fully installed and calibrated, select
a straight tract of ground that is similar to your actual
field conditions and as level as possible.
2. Measure a distance of 1000 feet (500 meters). Clearly
mark the beginning and end points with flags or some-
thing highly visible to the operator.
NOTE: Using a course with a different ground
surface, such as a hard surface road, will result in
different readings than exact field conditions.
PROCEDURE
1. With the console turned ON, use the Run/Hold button
to select HOLD mode. The HOLD icon will be displayed.
Turn the rotary dial to the “DISTANCE” position. Be sure
the display shows 0. If not, reset the distance counter
by pressing and holding “RESET” until the display return
to 0 (approximately one second). The word CLEAr will
be displayed when reset is pressed.
2. You are now ready to drive the measured course. Pick
a location on the vehicle to use as a marker for starting
and stopping the distance counting function (door
handle, mirror, step, etc.). You should begin driving the
course well ahead of the starting flag and drive past
the ending flag, using the Run/Hold button to start and
stop the counting function. It is not recommended to
start from a dead stop at the starting flag and stop at
the ending flag.
3. Use the Run/Hold button to select RUN mode, when
the marker on the vehicle passes the starting flag to
activate the distance counting function. The console
display numbers will increase, adding to the distance
total as you drive. Drive the pre-measured course and
use the Run/Hold button to select HOLD mode, when
the marker on the vehicle passes the ending flag, to
stop the distance counting function. The console
display should read “HOLD”. Stop the vehicle in a level
and safe area and continue with this procedure.
4. With the rotary dial still at DISTANCE (SPEED CAL),
press and hold the “CAL” key for one second. Once
the console is in “CAL”, CAL and the speed calibration
number will be displayed. Momentarily press CAL
and the word CAL will begin to flash and the distance
traveled will be displayed. See Illustration.
5. When the display shows distance (“CAL” is flashing),
verify whether the number displayed is the exact dis-
tance you drove (within + or - 1 - 2 %). If not, press the
“+” or “-” key to adjust the figure to match the distance
you actually drove. If the display reads too high, use the
“-” key to lower the displayed value. If the display
reads too low, use the “+” key to raise the displayed
value.
6. When the number shown on the display matches
(as closely as possible) the actual distance driven, you
have arrived at the correct calibration value. If you
cannot adjust the displayed distance to exactly match
the actual distance driven, adjust the figure as close
as possible to the actual distance. You may check the
calibration number by momentarily pressing CAL. The
word CAL and the SPEED CAL number will appear. Exit
“CAL” by pressing “CAL” for one second.
The speed sensor is now calibrated. To verify proper
calibration repeat the procedure a second time. Write
down the new speed calibration number and keep it in a
safe place. If the calibration values are ever accidentally
changed, you can simply re-enter this number.

18
Make sure your system is properly calibrated before
beginning to monitor speed, area, distance or RPM.
The Calc-An-Acre II features an easy-to-use rotary dial.
Simply turn the dial to the desired function. The console
gives a continuous display of the function selected until
another one is chosen.
CONSOLE POWER/SYSTEM ON/OFF
The system can be turned ON and OFF by the ignition
switch. When the console is turned on, it will display the
number of hours of operation for 2 seconds, then it will
display the software version along with the “v” icon for 2
seconds before it begins normal operation.
DISPLAY and ROTARY SWITCH
During normal operation, the console will display
information selected by the rotary switch position. The
functions that are active during normal operation are the
GREEN boxes. Calibration positions are identified by the
WHITE labeling on the right side of the rotary selector
(Please refer to Calibration section for details).
RUN/HOLD BUTTON
The RUN/HOLD is the master button for turning all counters
on and off. This function can be done either manually with
the RUN/HOLD button, or automatically, using the optional
RUN/HOLD sensor kit (P/N 01535).
“+” AND “” BUTTONS
During normal operation, when the rotary dial is set to
WIDTH +/-, each press of the “+” or “-” buttons will increase
or decrease the working width by 25%. See detailed
description below.
Width Reduction - On the Go (OTG)
The effective working width that was entered during cali-
bration, may be reduced in 25 percent increments during
operation to account for changes in actual working width in
the field.
In a full-width condition, the display will read “1 2 3 4”. To
change the working width on-the-go, turn the rotary switch
to “WIDTH +/-”. The display will show the current effective
width in inches (mm). Each press of the “-” key will reduce
the effective working width by 25 percent. The display will
also show the change. If the “-” key was pressed twice, the
display will now show “1 2” and the displayed width will
read half of the calibrated full width.
If the width has been reduced from the full width, it will
accumulate area based on the new width. When “HOLD” is
selected, either by using the Run/Hold key or by a remote
run/hold switch, the width will automatically default back
to the calibrated width. Width may be reduced while in
“HOLD”. The default to full width occurs only when chang-
ing the system status from “RUN” to “HOLD, not when
changing the system status from “HOLD to “RUN”.
Operation
General
Rotary Switch Positions
AREA
Displays the acres (hectares) (thousands of square feet)
covered since the counter was last reset to zero. The area
counters do not accumulate area when the console is in
HOLD. To select an AREA counter, use the “+” button to
select set 1, 2 or 3, indicated by the small numbers in the
lower right on the display. Do NOT use the “-” button
to select a counter because the button will clear it. (See
Resetting System Counters - page 19.) Each area counter
may be reset to zero independent of other area counters, or
other system counters.
SPEED
Displays the ground speed in miles (kilometers) per hour.
AREA/HOUR
Displays acres per hour (hectare per hour) (thousands of
square feet per hour) being covered.
TOTAL HOURS
Displays hours of operation. The hours may be reset
independent of the system counters. The hours do NOT
accumulate when system is in HOLD.
RPM
Displays Shaft RPM (requires P/N 01539 Shaft Sensor Kit).
See page 12for more information.
DISTANCE
Displays the feet (meters) driven since the counter was
last reset to zero. This counter does not accumulate when
the console is in HOLD. This counter may be reset to zero
independent of other system counters.
WIDTH +/
Displays working width in inches (meters). Pressing the “+”
or “-” button increments or decrements the working width
by 25%. The working width reverts back to the Width Cal
value when the Calc-An-Acre II power is turned off and
back on. See the Calibration section page 15 for more
information.
SUB HOURS
Displays sub hours such as for a particular area. The sub
hours may be reset independent of other system counters.
The hours do NOT accumulate when system is in HOLD.

19
The AREA, DISTANCE, TOTAL HOURS and SUB HOURS
counters maintain a running count during operation
regardless of the position of the rotary switch. When any of
these counters reach their maximum capacity, or when you
want to start a new count, the value may be reset to zero
by performing the following routine. Counters may be reset
independently of each other.
1. Put the system in HOLD.
2. Turn the rotary switch to the counter to be reset.
3. To reset distance, total hours and sub hours, turn the
rotary switch to the desired function and simply press
and hold the RESET button until the display reads
zero. The display will show the word “CLEAr” during
this process, and will show 0.0 when reset to zero is
complete.
4. To reset the area counters; there are three independent
AREA counters. The active counter is indicated by
the small numbers in the lower right area of the
display (1,2, or 3) when the rotary switch is in the
AREA position. Select the counter you want to use
by pressing the “+” button. The small number will
increment each time the “+” button is pressed (from
1 to 3, then rolls back to 1). DO NOT attempt to select
the counter number by using the “-” button, because
that will clear the active counter if held for 2 seconds. If
the “-” button is accidentally pressed, the console will
display “CLEAr” to alert the user that the counter will
be cleared. If the user continues to hold the “-” button
for 2 seconds “CLEAr” will disappear and be replaced
by 0.0, indicating that the selected counter has been
cleared.
To select an AREA counter: Verify that the desired counter is
selected, or use the “+” button to select.
SHAFT
CAL
SPEED
CAL
WIDTH
CAL
SUB HOURS
DISTANCE
AREA /
HOUR
TOTAL HOURS
SPEED
AREA
(1) (2) (3)
CAL
RUN
HOLD RESET
WIDTH +/-
®
II
RPM
UNITS
CALHOLD
1 2 3 4 5
Display indicates
that counter #1
is selected
SHAFT
CAL
SPEED
CAL
WIDTH
CAL
SUB HOURS
DISTANCE
AREA /
HOUR
TOTAL HOURS
SPEED
AREA
(1) (2) (3)
CAL
RUN
HOLD RESET
WIDTH +/-
®
II
RPM
UNITS
MAN HOLD
1
SHAFT
CAL
SPEED
CAL
WIDTH
CAL
VOLUME /
MINUTE DISTANCE
AREA /
HOUR
RATE SPEED
AREA
(1) (2) (3)
CAL
RUN
HOLD RESET
TANK
®
II
RPM
UNITS
MAN HOLD
CALHOLD
2
Display indicates
that counter #2
is selected
SHAFT
CAL
SPEED
CAL
WIDTH
CAL
SUB HOURS
DISTANCE
AREA /
HOUR
TOTAL HOURS
SPEED
AREA
(1) (2) (3)
CAL
RUN
HOLD RESET
WIDTH +/-
®
II
RPM
UNITS
MAN HOLD
3
Display indicates
that counter #3
is selected
Operation
Resetting System Counters

20
Troubleshooting
Messages/Warnings
This message appears when an error occurs while verifying calibration values during the
power-up. Enter calibration and verify that the calibration values have not changed and
exit
calibration. Cycling power will not clear the bad CAL message. The message can only
be
cleared by entering and exiting calibration mode.
Low Power. Check all power and ground connections.
Shows when Default Cal factors are saved in memory. This function takes place if CAL and “-”
buttons are pressed and held down for more than 3 seconds when loading Defaul Cal factors.
Has loaded Default Cal factors (appears when default calibration factors are loaded
by
holding CAL and “-” buttons while turning the console on).
On startup, the “V” is displayed next to the software version #.(Console hours displayed rst.)
The message alerts the user that the currently selected counter will be cleared if held for
2 seconds. Also serves as a reminder to use “+” button to select AREA counters.
Counters (DISTANCE, AREA, TOTAL HOURS or SUB HOURS) have overowed their maximum.
RESET (see page 20) to clear counters and resume counting.