PASCO SF-9500A User manual

®
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
TO
READ
5 mA
500 mA
SF-9500A
50 mA
Galvanometer
40
0
20
20
40
0
CE
®
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

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Heavy Duty Galvanometer Technical Support
012-07749B
2
Specifications
Limited Warranty
For a description of the product warranty, see the PASCO catalog.
Copyright
The PASCO scientific 012-07749B Heavy Duty Galvanometer Instruction
Sheet is copyrighted with all rights reserved. Permission is granted to
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: [phone] (worldwide)
800-772-8700 (U.S.)
Fax: [phone]
Web: www.pasco.com
Email: [email protected]