PASCO SF-9500A Manual de usuario

Instruction Sheet

012-07749B

Heavy Duty Galvanometer

SF-9500A

*012-07749*

Introduction

The PASCO Model SF-9500A Heavy Duty Galvanometer is a

rugged yet sensitive instrument designed specifically for stu-

dent experiments. It has a center-zero meter that ensures easy

determination of polarity, and three current ranges. A

“Push-To-Read” switch protects the meter during hookup by

shunting the current through an equivalent resistor. When per-

forming a null-current experiment, such as measuring resis-

tance using a Wheatstone bridge, it is easy to balance the

current using the 5 mA (milliampere) range, then stepping

down through the lower current ranges to very accurately

determine the point of zero current.

Operation

To zero the meter:

Place the meter in the position (vertical or horizontal) in which

it will be used. Disconnect the meter. Use a small, flat-blade

screwdriver to turn the Zero Adjust Screw (located on the case

below the meter) until the meter needle e is aligned with zero

on the scale.

To measure current:

1. Connect the circuit between the negative terminal of the gal-

vanometer and the red input connector with a current rating

greater than the expected current.

2. When the connections are made, and you are ready to mea-

sure the current, press and hold the PUSH TO READ but-

ton.

3. Now read the current on the meter.

The current ranges displayed beside the input connectors refer

to the current value that will give a full-scale meter deflection.

For example, a meter reading of +40 in the 5 mA range indi-

cates a current of 4 mA flowing through the galvanometer. A

reading of –40 indicates that 4 mA of current is flowing in the

opposite direction.

PUSH

READ

5 mA

500 mA

SF-9500A

50 mA

Galvanometer

Zero

Adjust

Screw

NOTE: If the meter is zeroed in one position and the

position is changed, it may need to be zeroed again.

NOTE: It is a good idea to begin with the 5 mA range,

then step down to the lower ranges as required. The

meter is protected while you make the connections,

because the current does not pass through the meter.

Instead it passes through a parallel shunt resistor that h

as the same resistance as the meter.

Directionofpositive

current flow

Current Flow

Heavy Duty Galvanometer Technical Support

012-07749B

Specifications

Limited Warranty

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

The PASCO scientific 012-07749B Heavy Duty Galvanometer Instruction

non-profit educational institutions for reproduction of any part of this man-

ual, providing the reproductions are used only in their laboratories and

classrooms, and are not sold for profit. Reproduction under any other cir-

cumstances, without the written consent of PASCO scientific, is prohibited.

Trademarks

PASCO and PASCO scientific 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

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 elec-

tronic 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 product representative.

The European Union WEEE (Waste Electronic and Elec-

trical Equipment) symbol and on the product or its pack-

aging indicates that this product must not be disposed

of in a standard waste container.

Technical Support

For assistance with any PASCO product, contact PASCO at:

For the latest information about the Heavy Duty Galvanome-

ter, go to the PASCO web site at www.pasco.com and enter

SF-9500A in the search window.

Measuring

Range Internal

Resistance Maximum

Current Accuracy

± 5 mA 8 100 mA 2%

± 500 A 80 100 mA 2%

± 50 A 800 1 A 3%

Address: PASCO scientific

10101 Foothills Blvd.

Roseville, CA 95747-7100

Phone: 916-786-3800 (worldwide)

800-772-8700 (U.S.)

Fax: (916) 786-7565

Web: www.pasco.com

Email: [email protected]

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