PASCO PS-3202 Reference Manual

Reference Guide

®

Bluetooth status LED

Battery status LED

Side View

Micro USB port

ON button

Bumper Attachment

Hook Attachment

Cart/Track
Thumbscrew

Rod Clamp Thumbscrew

Power: Rechargeable Battery

OR

USB Cable

Micro USB Cable

Connection:

Device ID

Wireless Force-Acceleration Sensor

PS-3202

013-14710C

Hardware

Included Equipment Part Number

Wireless Force-Acceleration Sensor

Micro USB Cable (1 meter)

Hook Attachment

Cart/Track Thumbscrew

Bumper Attachment

Rod Clamp Thumbscrew

PS-3202

Introduction

The Wireless Force-Acceleration Sensor is a
combination wireless
computer or tablet device through , and can
also connect to a computer with a USB cable (included).
The sensor measures force up to ±50 newtons (N),
acceleration up to ±16 g (1 g = 9.8 m/s

and

USB sensor that connects to a

2

), and angular

rotation rate up to ±2000 degrees per second (dps). The
sensor measures force as a push or pull along its X axis
and measures acceleration in three dimensions (X, Y,
and Z). The PASCO Data Collection Software can show
the resultant acceleration. The sensor uses a
micro-electromechanical system (MEMS) device.

The sensor is designed to optimize the battery usage
time. Since each sensor has a unique Device ID
number, more than one can be connected to a computer
or tablet at the same time.

800-772-8700 (US) [phone]
www.pasco.com [e-mail]

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Wireless Force-Acceleration Sensor PS-3202

Bluetooth status LED

Micro USB

port

Micro USB

cable

USB port

Data Collection Software

PASCO Capstone SPARKvue

• Mac OS X • Mac OS X

• Windows • Windows

•iOS

•Android

• Chromebook

See the PASCO Web page at

www.pasco.com/software

for help in selecting the right PASCO software and to
check the latest versions.

Software Help

See the SPARKvue Help or PASCO Capstone Help for
information about collecting, displaying, and analyzing
data.

See Appendix A for more information about the PS-3500 Adapter and
Mac OS X models.

Initial Step: Charge the Battery

• Connect the Cable: Use the Micro USB Cable to
connect the micro USB port on the Wireless
Force-Acceleration Sensor to a USB port or USB
charger such as the PASCO PS-3501 USB
Charging Station. Charging begins automatically.
The charger circuit inside the sensor turns itself off
when the unit is fully charged. The battery status
LED will shine yellow as the battery is charging, and
will shine green when the battery is charged. The
battery is partially charged at the factory. Initial
charging time may be three hours or longer
depending on the power source and the condition of
the battery.

ON/OFF Information

• In SPARKvue, select the HELP button ( ) in any
screen including the Home Screen.

• In PASCO Capstone, select PASCO Capstone Help
from the Help menu, or press F1.

Compatibility

Check the PASCO Web page at

www.pasco.com/compatibility

for the latest information on Bluetooth SMART
compatibility.

Platform Bluetooth SMART Compatibility

iOS iPad 3 and later

SPARK Element All models

Android Android 4.3 and later

Chromebook Chrome OS (requires PS-3500 Adapter*)

Mac OS X Models introduced July 2011 or later*

Windows Windows 7 and later (requires PS-3500 Adapter*)

iPhone 4S and later
iPod touch 5 and later

To turn the sensor off, press and hold the ON button for
a moment until the status LEDs stop blinking. The
Wireless Force-Acceleration Sensor puts itself to sleep
after several minutes of inactivity if not connected and
about one hour of inactivity if connected.

LED Information

The Bluetooth and the Battery Status LEDs operate as
follows depending on the type of connection:

For a wireless Bluetooth connection:

Bluetooth LED Status Battery LED Status

Red blink Ready to pair Red blink Low power

Green blink Connected

Yellow blink Logging*

For a micro USB cable connection to a USB

Bluetooth LED Status Battery LED Status

OFF -- Yellow ON Charging

port

:

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Set Up the Software PS - 3202

Bluetooth LED Status Battery LED Status

OFF -- Green ON Charged

Yellow blink Logging*

For a micro USB cable connection to a USB

:

Bluetooth LED Status Battery LED Status

Red blink Ready to pair Yellow ON Charging

Green blink Connected Green ON Charged

Yellow blink Logging*

charger

*Logging: PASCO wireless sensors can either stream
live data to a compatible device or log data inde­pendently (save it to the sensor’s onboard memory). The
data can then be uploaded to the device for display and
analysis at a later time. Logging capability supports
long-term or remote data collection while not connected
to a computing device.

Note: Both SPARKvue and PASCO Capstone support
logging. Check the PASCO Web page at:

www.pasco.com/software

for the latest software version. Please check the soft­ware online help (User’s Guide) for details about log­ging.

Zero (Tare) the Force-Acceleration Sensor

At the beginning of an experiment, the measurement
from the sensor may not be zero when the force or
acceleration is actually zero. This is a normal behavior
that is corrected when you zero (or tare) the sensor
using the PASCO Data Collection Software.

In SPARKvue, the process for setting the Wireless
Force-Acceleration Sensor to zero starts in the Home
Screen ( ).

• To zero the Wireless Force Sensor, start by
selecting Force in the Home Screen to open a
Graph display of Force versus Time.

• In the Graph display, select the Experiment Tools
( ) icon to open the Experiment Tools window.

• In the Experiment Tools window, select Configure
Sensor in the menu to open the Sensor
Configuration window.

• In the Sensor Configuration window, select the Edit
Sensor Properties button to open the Edit Sensor
Properties menu.

• The Edit Sensor Properties menu shows two
choices:

• Wireless Force Sensor

Set Up the Software

SPARKvue

Connecting the Wireless Sensor to a Tablet or a
Computer via Bluetooth

• For SPARKvue, select the Bluetooth icon ( ) to
open the Wireless Devices list. In the Wireless
Devices list, the sensors are ordered by proximity to
the device. Select the correct address that matches
the XXX-XXX number found on the sensor. Select
Done. A list of measurements appears under the
sensor in the Home Screen.

Connecting the Wireless Sensor to a Computer with the
Micro USB Cable

• Connect the micro end of the included Micro USB
Cable into the micro USB port on the end of the
sensor. Connect the other end of the Micro USB
Cable to a USB port on the computer, or into a
powered USB hub connected to the computer.

• Wireless Acceleration Sensor.

• Select the Wireless Force Sensor choice from the
menu to open the Edit Sensor Properties window.

• The Edit Sensor Properties window offers two
choices under Tare Sensor:

• Zero Sensor Automatically On Start

:

• Zero Sensor Now

• In the Edit Sensor Properties window, select Zero
Sensor Automatically On Start if you want the
sensor to be set to zero every time that data
collection begins. Select Zero Sensor Now to set the
sensor to zero manually.

•Select OK at the bottom of the window to return to
the Graph display.

To zero the acceleration for the Force-Acceleration
Sensor, return to the Home Screen ( ). (NOTE:
There may be a message about saving your data.)

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Wireless Force-Acceleration Sensor PS-3202

Button

Menu

Common Rate Button and Menu

Zero button

Zero Button

Properties

icon

Hardware Setup Window

• To zero the Wireless Acceleration Sensor, start by
selecting any of the choices for acceleration in the
Home Screen to open a Graph display of
Acceleration versus Time.

• In the Graph display, select the Experiment Tools
( ) icon to open the Experiment Tools window.

• Follow the same procedure that you used for setting
the force measurement of the Force-Acceleration
Sensor to zero.

Collect Data

• In the SPARKvue Home Screen, select a
measurement from the list under the sensor’s name.
A graph of the measurement versus time opens.

• In SPARKvue, select the Start button ( ) to begin
collecting data.

PASCO Capstone

Connecting the Wireless Sensor to a Tablet or a
Computer via Bluetooth

• Click the Common Rate button in the Control palette
below the workbook to open the Common Rate
menu.

•Select Wireless Force Sensor from the menu and
then click the zero button. This will set the sensor
reading to zero.

• Repeat the process to zero the “Wireless
Acceleration Sensor” if needed.

• For PASCO Capstone, select Hardware Setup in the
Tools palette. The sensors in the list are ordered by
proximity to the wireless device. Select the sensor
with the address that matches the XXX-XXX Device
ID number on the sensor.

Connecting the Wireless Sensor to a Computer with the
Micro USB Cable

• Connect the micro end of the included Micro USB
Cable into the micro USB port on the end of the
sensor. Connect the other end of the Micro USB
Cable to a USB port on the computer, or into a
powered USB hub connected to the computer.

Zero (Tare) the Force-Acceleration Sensor

At the beginning of an experiment, the measurement
from the sensor may not be zero when the force or
acceleration is actually zero. This is a normal behavior
that is corrected when you zero (or tare) the sensor
using the PASCO Data Collection Software.

In PASCO Capstone, there are options for setting the
Wireless Force-Acceleration Sensor to zero.

Another option is to select a choice in the sensor’s
Properties palette:

• Click Hardware Setup in the Tools palette to open
the Hardware Setup window.

• Click the Properties icon for the Wireless Force
Sensor in the Hardware Setup window to open the
Properties window.

One option is to use the Common Rate button:

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Set Up the Hardware PS - 3202

A.

B.
C.

Wireless Force Sensor Properties Window

Bumper

Attachment

Hook

Attachment

Arrows indicate direction

of acceleration

Z

X

Y

•In the Properties window, select one of the three
choices and then click OK at the bottom to close the
window.

•Choice A: Zero Sensor Measurements at Start ­Zero the Wireless Force Sensor at the start of data
collection.

•Choice B: Zero Sensor Now - Works the same as a
Zero button.

• Choice C: Remove Sensor Zero Offset - Undo.
Return the Wireless Force Sensor to its previous
state.

• Repeat the process for the Wireless Acceleration
Sensor if needed.

Set Up the Hardware

Connecting Bumper and Hook Attachments

Screw the bumper or hook attachment into the threaded
hole on the front end of the sensor as shown.

Direction of Acceleration Sensitivity

The acceleration sensing units inside the sensor are
oriented so that the lines of greatest sensitivity follow the
three X-Y-Z arrows indicating the direction of
acceleration.

Collect Data

• In PASCO Capstone, select a display in the main
window or from the Display palette. In the display,
use the <Select Measurement> menu to pick a
measurement to be shown.

• Select Record to begin collecting data.

Troubleshooting the Wireless Force-Acceleration
Sensor

• If the Wireless Force-Acceleration Sensor loses
Bluetooth connection and will not reconnect, try
cycling the ON button. Press and briefly
button until the status LEDs blink in sequence, and
then release the button. Start the sensor in the usual
way.

• If the sensor stops communicating with the
computer software or tablet application, try
restarting the software or application. If the problem
remains, press and hold the ON button for 10
seconds and then release. Start the sensor in the
usual way.

• Turn Bluetooth off and then turn it back on. Retry.

hold

the

In this orientation, the X-axis direction is ‘along’ the axis
of the sensor, the Y-axis direction is ‘perpendicular’ and
horizontal to the axis, and the Z-axis direction is
‘perpendicular’ to the label on top.

Test the Sensor’s Output Using Earth’s Gravity

Start the PASCO Data Collection Software. If the
Force-Acceleration sensor is held so that the X-axis on
the top of the sensor is vertical and pointing upward, the
Acceleration X-axis reading is 1.0 g. If the sensor is

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Wireless Force-Acceleration Sensor PS-3202

+1.0 g in X

-1.0 g in X

+1.0 g in Y

-1.0 g in Y

-1.0 g in Y

+1.0 g in Z

-1.0 g in Z

Rod Clamp

Thumbscrew

Cart/Track Thumbscrew

turned so the X-axis is vertical but pointing downward,
the Acceleration X-axis reading is -1.0 g (where “g”
represents the acceleration due to gravity).

If the sensor is
rotated so that the
Y-axis on the top of
the sensor is vertical
and pointing upward,
the Acceleration
Y-axis reading is 1.0
g. If the sensor is
turned so that the
Y-axis is pointing
downward, the
Acceleration Y-Axis
reading is -1.0 g.

If the sensor is
placed so the back is
on a horizontal
surface with the
label facing upward,
the Acceleration
Z-axis reading is 1.0 g. If the sensor is placed label side
down so that the back is facing upward, the Acceleration
Z-axis reading is -1.0 g.

Mounting the Sensor

Mounting the Sensor on a Rod

Slide the
sensor onto a
rod and
secure it with
the Rod
Clamp
Thumbscrew
as illustrated.

Mounting the Sensor on a PASCO Cart

1. Insert the included Cart/Track Thumbscrew through
the hole in the sensor labeled Cart.

2. Screw the thumbscrew into the threaded hole on the
top of the PASCO cart.

6

Mounting the Sensor on an IDS Bracket

1. Insert one of the included plastic thumbscrews from
the Force Accessory Bracket through the hole in the
Force Accessory Bracket (PASCO part CI-6545) as
shown.

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Set Up the Hardware PS - 3202

Force Accessory

Bracket

Plastic thumbscrew

T-slot

Discover Collision

Bracket

2. Screw the thumbscrew into the threaded hole on the
sensor labeled IDS Bracket

.

Mounting the Sensor on a Discover Collision
Bracket

1. Mount the Discover Collision Bracket (PASCO part
ME-8973A) into the T-slot on a PASCO track.

2. Temporarily remove the rod clamp thumbscrew from
the sensor. Use the thumbscrew on the bracket to
attach the sensor to the bracket

In typical classroom/lab use, this would translate to a
battery life between charges ranging from one to four
weeks or more, because full-day continuous sampling
would be unusual. Even in the most extreme case with a
high sample rate, the Force-Acceleration Sensor battery
would support a full day of use before needing to
recharge.

Maximizing Battery Life

One of the factors that affects battery life is the storage
temperature. Therefore, avoid storing the sensor in very
cold or very hot environments.

Suggested Experiments

Practically any experiment that uses a force,
acceleration, or rotational motion measurement can be
done with the PS-3202 Wireless Force-Acceleration
Sensor. See the PASCO Web site at

www.pasco.com/products/lab-manuals

for more information about experiments.

Calibrating the Sensor

.

About the Battery

The Wireless Force Acceleration Sensor’s battery is
partially charged at the factory. If the battery status LED
blinks red, use the micro USB cable to connect the
sensor to a USB port or a USB charger.

Battery Usage

Battery life is very important to making the sensor simple
and always ready to use, so all of the PASCO wireless
products are designed for long battery life. For example,
the sensor turns itself off after a few minutes of inactivity
to conserve battery life.

The battery life between charges for the sensor varies
depending on the sampling rate. The battery life ranges
between eleven hours for high sample rates to more
than 70 hours for low sample rates.

The sensor is factory calibrated. Further calibration is
not always necessary, especially if you are measuring a
change in force, acceleration, or rotational motion rather
than absolute values. However, it is possible to calibrate
the sensor. For detailed information, see Appendix B.

Specifications

Item Value

Force Range ±50 newtons (N)

Acceleration Range

Angular Rotation Rate Range up to ±2000 degrees per second

Force Resolution 0.03 N

Accuracy 0.1 N

Logging Yes

Accessories

• CI-6545 IDS Force Accessory Bracket

• ME-8973A Discover Collision Bracket

• ME-9884 Bumper Accessory Set

• ME-6617 Rocket Engine Test Bracket

up to ±16 g (1 g = 9.8 m/s

2

)

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Wireless Force-Acceleration Sensor PS-3202

Technical Support

For assistance with any PASCO product, contact
PASCO at:

Address: PASCO scientific

10101 Foothills Blvd.
Roseville, CA 95747-7100

Phone: [phone] (worldwide)

8700-772-8700 (U.S.)

Web:

Email: [e-mail]

The Reference Guide will be updated periodically. For
the latest revision of this Reference Guide, visit the
PASCO Web site at

and enter the product number, PS-3202, in the text
window.

Replacement Parts

www.pasco.com/support

www.pasco.com/manuals

CE Statement
This device has been tested and found to comply with the essential
requirements and other relevant provisions of the applicable EU
Directives.

Product End of Life Disposal Instructions:
This electronic product is subject to disposal and recycling regulations that
vary by country and region. It is your responsibility to recycle your
electronic equipment per your local environmental laws and regulations to
ensure that it will be recycled in a manner that protects human health and
the environment. To find out where you can drop off your waste equipment
for recycling, please contact your local waste recycle/disposal service, or
the place where you purchased the product.

The European Union WEEE (Waste Electronic and
Electrical Equipment) symbol (to the right) and on the
product or its packaging indicates that this product
must not be disposed of in a standard waste
container.

Battery Disposal Instructions:
Batteries contain chemicals that, if released, may affect the environment
and human health. Batteries should be collected separately for recycling,
and recycled at a local hazardous material disposal location adhering to
your country and local government regulations. To find out where you can
drop off your waste battery for recycling, please contact your local waste
disposal service, or the product representative.

The Lithium Polymer (Li-Poly) rechargeable battery used in this product is
marked with the International symbols to indicate the need for the
separate collection and recycling of batteries.

For information about possible replacement parts,
contact Technical Support:

USB Cable, Micro-to-USB A
Hook Attachment
Bumper Attachment
Cart/Bracket Thumbscrew

Limited Warranty
For a description of the product warranty, see the PASCO catalog. For
more information visit www.pasco.com/legal

Copyright
This PASCO scientific
reserved. Permission is granted to non-profit educational institutions for
reproduction of any part of this manual, providing the reproductions are
used only in their laboratories and classrooms, and are not sold for profit.
Reproduction under any other circumstances, without the written consent
of PASCO scientific, is prohibited.

Trademarks
PASCO, PASCO scientific, PASCO Capstone, PASPORT, and
SPARKvue are trademarks or registered trademarks of PASCO scientific,
in the United States and/or in other countries. All other brands, products,
or service names are or may be trademarks or service marks of, and are
used to identify, products or services of their respective owners. For more
information visit www.pasco.com/legal.

Reference Guide

is copyrighted with all rights

FCC Statement
This Class A digital device complies with part 15 of the FCC Rules.
Operation is subject to the following two conditions: (1) This device may
not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired
operation.

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Technical Support PS - 3202

PS-3500 USB

Bluetooth 4.0

Adapter

1

Appendix A: Compatibility

The Mac Mini and MacBook Air were updated with

Bluetooth SMART support in 2011. The MacBook Pro

Check the PASCO Web page at

was updated in 2012. The Mac Pro that debuted in
December 2013 has Bluetooth SMART support.

www.pasco.com/compatibility

Exception: Before you upgrade to El Capitan (Mac OS X

for the latest information on Bluetooth SMART
compatibility.

10.11.x), if you have a Macintosh with LMP version “0x4”
that requires the PS-3500 USB Bluetooth 4.0 Adapter,
please contact PASCO Technical Support for further
instructions.

Platform Bluetooth SMART Compatibility

iOS iPad 3 and later

SPARK Element All models

Android Android 4.3 and later

Chromebook Chrome OS (requires PS-3500 Adapter*)

Mac OS X

Windows Windows 7 and later (requires PS-3500 Adapter*)

1

iPhone 4S and later
iPod touch 5 and later

Models introduced July 2011 or later

What is Bluetooth SMART

Bluetooth SMART (also known as Bluetooth Low Energy
or Version 4.0 of the Bluetooth specification) is the latest
protocol of the proprietary open wireless technology
standard created by telecoms vendor Ericsson in 1994.
It is the power- and application-friendly version of
Bluetooth that was built for the Internet of Things (IoT).

®

?

*The PS-3500 USB Bluetooth 4.0
Adapter, when connected to a USB
port, allows up to three Bluetooth
SMART devices, such as this PASCO
wireless device, to connect to Windows
computers, Chromebooks, and older
Macintosh computers.

Note: The PS-3500 USB Bluetooth 4,0
Adapter is the only adapter we can currently
recommend. Many other Bluetooth 4.0 adapters are
available but this adapter has a specific design that
enables in-app pairing of Bluetooth SMART sensors.

1

To check the Mac computer’s Bluetooth compatibility,

do the following:

• Click the

• Select

• Click the

• Click the

 (Apple) Menu.

About This Mac

More Info

System Report

... button.

... button.

• Select

• Scan down the list of information until you find “LMP

• If your Mac is equipped with Bluetooth SMART, the

Bluetooth

underneath

from the sidebar on the left,

Hardware

.

Version”.

LMP Version will show 0x6. (Anything lower than
0x6 means an older version of Bluetooth. Your
device will need the PS-3500 USB Bluetooth 4.0
Adapter.)

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Wireless Force-Acceleration Sensor PS-3202

Appendix B: Calibration

Calibration is not necessary, especially if you are
measuring a change in force rather than absolute force
values. However, it is possible to calibrate the sensor.

Prepare for Calibration

Calibration will need a 1 kilogram mass, the hook
attachment, and a horizontally mounted support rod to
hold the sensor. The sensor will need to be “connected”
with a tablet or computer, and the data collection
software (for example, SPARKvue) should be running.

Using SPARKvue Software for Calibration

See the SPARKvue Help for information about
calibrating:

• In SPARKvue, select the HELP button ( ) in any
screen, such as the Home Screen.

1. Mount the sensor on a
horizontal rod. Screw the hook
attachment into the sensor.

2. Click (or press) the Experiment
Tools button ( ).

•The Experiment Tools screen
opens.

10. Remove the 1 kilogram mass from the hook
attachment. The net force now is zero N.

11. Under Calibration Point 2, click the Standard Value
box and enter the second known force value (i.e., 0).

12. Under Calibration Point 2, click the Read From
Sensor

box.

• The second value measured by the sensor is
transferred to the Sensor Value box.

13. Click OK.

Using PASCO Capstone for Calibration

See the PASCO Capstone Help for information about
calibrating:

• In PASCO Capstone, select PASCO Capstone Help
from the Help menu, or press F1.

1. Mount the sensor on a horizontal rod. Screw the
hook attachment into the sensor.

2. Click Calibration ( ) in the Tools palette.

3. Choose the measurement you would like to calibrate
now: Force Measurement.

4. Click Next.

3. Click Calibrate Sensor.

•The Calibrate Sensor: Select Measurement screen
opens.

4. Click the Sensor box and click the sensor to be
calibrated.

5. Click the Calibration Type box and click a calibration
type. (For this example, click “2-point”.)

6. Click Next.

•The Calibrate Sensor Enter Values screen opens.

7. Hang the 1 kilogram mass on the hook attachment.

8. The gravitational force on the mass is pulling in the
negative direction at -9.8 newtons (N). Under
Calibration Point 1, click the Standard Value box
and enter the known force value (that is, -9.8).

9. Under Calibration Point 1, click Read From Sensor.

• The value measured by the sensor is transferred to
the Sensor Value box.

5. Choose the type of calibration you would like to
perform: Two Standards (2 point).

6. Click Next.

7. Hang the 1 kilogram mass on the hook attachment.

8. The net force on the sensor is -9.8 N. Enter the
value in the Standard Value text box.

9. When the Current Value stabilizes, click Set Current
Value to Standard Value.

10. Click Next.

11. Remove the 1 kilogram mass from the hook
attachment. The second force value is zero N.

12. Enter the second known force value (i.e., 0) in the
Standard Value text box.

13. When the Current Value stabilizes, click Set Current
Value to Standard Value.

14. Click Next.

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15. Click Finish.

Theory of Calibration

One of the functions of the PASCO Data Collection
Software is to take the stream of raw data from a sensor
and transform it into the calibrated data that you see in
the Graph, Table, and other displays. If you do not
calibrate a sensor yourself, the software uses a default
calibration that is loaded when the sensor is connected.

You can think of the software as taking in raw data and
outputting calibrated data. When you perform a
calibration, the software redefines the linear equation
that transforms the raw input data into the calibrated
output data. The linear function is of the form:

Raw Input = Slope x Calibrated Output + Offset

Or:

Calibrated Output = (Raw Input - Offset)/Slope

The function can be represented graphically as a line.

Two-Point

In a two-point calibration, you reset two points to define
a new line. This type of calibration affects both the slope
and the offset.

One-Point Slope

In a one-point slope calibration, you reset only one point.
The slope of the line changes so that the line intersects
the new point, while the offset (or Y-intercept) does not
change.

Two points, Pt 1 and Pt 2, define the line. In the
two-point calibration procedure, each point is reset by
associating a known standard value (for instance, the
temperature of ice water) with a raw input measurement
that the sensor sends out when it is in that standard. In a
one-point calibration, only one of the points is reset by
the user.

Types of Calibration

There are three types of calibration: two-point, one-point
slope, and one-point offset. Any of these calibrations can
be performed on a single sensor, or simultaneously on
multiple similar sensors; however, for any given sensor,
the software will automatically select the most typical
calibration type as the default setting.

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One-Point Offset

In a one-point offset calibration, you reset only one point.
The line shifts so that it intersects the new point, but its
slope does not change.

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Wireless Force-Acceleration Sensor PS-3202

Offset calibration is usually used to make one sensor
agree with another sensor. Due to normal variation
among probes, a second probe might read consistently
higher than the first probe. Normally this difference
would be insignificant; however, an offset calibration can
be used to bring the sensors into closer alignment.

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