I n s tr u c t i o n M a n u a l

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Temperature Array

PS-2157

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4

3

2

Included Equipment

1.

Temperature Array

2.

Eight-probe Bundle

3.

Fast Response Temperature Probes (qty. 3)

4.

Adhesive Patches (qty. 10)

Compatible Temperature Probes

Fast-response Temperature Probes

Stainless Steel Temperature Probe

Part Number

PS-2157

514-09083

PS-2135 (3-pack)

PS-2525 (100-pack)

PS-2135 (3-pack)

PS-2153

Skin/Surface Temperature Probe PS-2131

10 k

Ω

thermistors embedded in other PASCO devices see PASCO catalog or www.pasco.com

Compatible PASPORT Interfaces

PS-2002 Xplorer GLX

Xplorer PS-2000

Power Link

USB Link

PS-2001

PS-2100

Introduction

The PASPORT Temperature Array works with up to eight temperature probes and a PASPORT interface to collect multiple streams of temperature data at up to 200 samples per second per channel.

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T e m p e r a t u r e A r r a y

Separate temperature probes (such as the three included fast-response probes) can be connected to the individual input ports, numbered 1 through 8 (right); or the special eight-probe bundle (below) can be connected to the multiport (below right).

Setu p

Three probes connected to individual ports

Setup

Eight-probe bundle connected to multiport

Eight-probe bundle

Each of the probes in the eight-probe bundle is identified by a colored band. The colors correspond to the Temperature Array’s data channel numbers as shown in the table (right).

When measuring the surface temperature of a person or object, use the included adhesive patches to attach the probes.

Other PASCO devices containing embedded 10 k

Ω

thermistors (such as the Heat

Conduction Apparatus, TD-8513) can be connected to the individual ports or the multiport of the Temperature Array using the cables included with those devices.

Color

Brown

Red

Orange

Yellow

Green

Blue

Violet

Gray

Hardware Setup

The following three steps can be performed in any order.

1.

Connect the eight-probe bundle to the multiport or connect up to eight separate temperature probes to the individual input ports.

Probes can be connected to the individual ports in any order (you don’t have to start with port 1), and any of the ports can be left unconnected.

Do not use the individual ports and the multiport at the same time.

2.

Connect the cable of the Temperature Array to a PASPORT interface.

3.

If you will be using a computer, connect the PASPORT interface to the computer’s USB port.

DataStudio Setup

If you will be using the Temperature Array with a computer, install

DataStudio version 1.9.5 first.

1.

When you connect the Temperature Array to the computer through a PASPORT interface, the PASPortal window will launch automatically (if DataStudio is not already running.

2.

Double click Temperature Array.ds to open the Temperature Array’s configured file in DataStudio.

2 double click

The color scheme is similar to the one commonly used to identify resistor values.

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Data

Channel

Number

1

2

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8

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To open to configuration file directly, navigate to the folder c:\Program Files\DataStudio\eLabs\Sensors\ (Windows) or

HD:Aplications:DataStudio:eLabs:Sensors (Mac).

3.

The configuration file contains a run of sample data showing the data color corresponding to each data channel.

To delete the sample data before collecting your own data, press Alt+Minus (Windows) or +Minus (Mac).

4.

Click to begin data collection.

To view and change the sample rate, units of measure, and other sensor properties, click .

DataStudio configuration file, Temperature Array.ds

Xplorer and Xplorer GLX Setup

If you will be using an Xplorer or Xplorer GLX in logging mode (not connected to a computer), connect the Temperature Array to the Xplorer or Xplorer GLX and press

to begin data collection.

Multiple-measurement Alignment

When you are using multiple temperature probes, you may find that their reading differ slightly when they are measuring the same thing. In the example illustrated

(right), measurements from eight probes in the same container of water vary by about 0.3 °C. The multiple-measurement alignment procedure adjusts the calibrations of the probes so they agree more closely.

The procedure described here for DataStudio can also be performed on the Xplorer GLX. See the

Xplorer GLX Users’ Guide for detailed instructions.

1.

Click to open the Experiment Setup window. Click

to open the calibration dialog box.

2.

From the Sensor field, select the Temperature Array.

3.

Select the “Calibrate all similar measurements simultaneously” option.

4.

Place all of the probes in a container of room-temperature water. (If you are calibrating thermistors embedded in a device, allow the thermistors to come to equilibrium at room temperature.)

5.

Observe the Present Sensor Measurement and wait until it has stabilized.

6.

From the Calibration Type menu, select 1 Point (Adjust Offset Only).

7.

Click the Read From Sensor button for Point 1.

8.

Click OK to accept the new calibration; or click Cancel to revert to the previous or default calibration.

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Two-point calibration

Though it is usually not necessary, a two-point calibration can be performed on a single probe, or on all probes simultaneously, to make the measurements more accurate.

For step-by-step instructions refer to the documentation for DataStudio version 1.9.5, the Xplorer, or the Xplorer GLX.

Oversampling

The degree of oversampling that takes place within the Temperature Array depends on the sample rate and the number of connected probes. To maximize the oversampling, set the sample rate as low as possible and disconnect any unused probes. In many cases, increased oversampling reduces noise, produces smoother data, and improves the measurement resolution. This effect is especially noticeable when very small temperature changes are measured.

Measurement Repetition

At high sample rates, the Temperature Array may occasionally repeat a measured value in order to maintain the flow of data without exceeding its processing capacity.

The maximum sample rate at which this does not occur depends on the number of connected probes, as shown in the table (right).

At sample rates above these thresholds, you may notice that a rapidly changing temperature graph has occasional plateaus where the sampled temperature remains constant for two or more points in a row. To reduce the effect of measurement repetition, use the smooth(n, x) function in DataStudio’s calculator. (For information about the smooth function, open the Help menu in DataStudio and search for “smooth.”)

S p e c i f i c a t i o n s

Maximum Sample Rate without

Measurement Repetition

Number of

Probes

Rate

(Hz)

1

2 or 3

4 to 8

200

100

50

Specifications

Measurement Range

Maximum Range of Fast-response Probes and Eight-probe Bundle

Accuracy

Resolution

Repeatability

Maximum Sample Rate

Unit Options

-35 °C to 135 °C (probe dependent)

-35 °C to 70 °C

±0.5 °C

0.0025 °C

0.01 °C

200 Hz per Temperature Sensor

°C, °F, K

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Technical Support

For assistance with any PASCO product, contact PASCO at:

Address: PASCO scientific

10101 Foothills Blvd.

Roseville, CA 95747-7100

Phone: 916-786-3800 (worldwide)

800-772-8700 (U.S.)

Fax:

Web:

(916) 786-3292 www.pasco.com

Email: [email protected]

T e c h n i c a l Su p p o r t

Limited Warranty

For a description of the product warranty, see the PASCO catalog.

Copyright

The PASCO scientific 012-08867A Temperature Array Instruction Manual is copyrighted with all rights 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, DataStudio, PASPORT, Xplorer, and Xplorer GLX are trademarks or registered trademarks of PASCO scientific, in the United States and/or in other countries. For more information visit www.pasco.com/legal. Windows is a registered trademark of Microsoft Corporation in the United States and/or other countries. Mac is trademark of Apple Computer, Inc., registered in the

U.S. and other countries.

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