Pasco SF-9500A STUDENT GALVANOMETER User Manual download pdf

Instruction Sheet

for the PASCO

Model SF-9500A

STUDENT GALVANOMETER

012-07749A

Introduction

The PASCO SF-9500A Student Galvanometer is a

rugged, yet sensitive instrument, designed specifically

for student 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 performing a null-current

experiment, such as measuring resistance using a

Wheatstone bridge, it is easy to balance the current

using the 5 mA range, then stepping down through the

lower current ranges to very accurately determine the

point of zero current.

PUSH

READ

5 mA

500 mA

SF-9500A

50 mA

Galvanometer

Operation

To zero the meter:

Place the meter in the position in which it will be

used, vertically or horizontally. Disconnect the meter.

Use a small, flat-head screwdriver to turn the zero-

adjust screw (located on the meter housing below the

meter) until the meter needle aligns with the zero

mark on the scale.

NOTE: If the position of the meter changes after it is

mechanically aligned, the meter may need to be zeroed

again.

To measure current:

1. Connect the circuit between the negative terminal

of the galvanometer and the red input connector

with a current rating greater than the expected

current.

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 has the same resistance

as the meter.

2. When the connections are made, and you are ready

to measure the current, press and hold the PUSH

TO READ button.

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 indicates 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.

1 2

Summary of Contents

Page 1 - STUDENT GALVANOMETER

Page 2 - Current flow

Student Galvanometer 012-07749A2Limited WarrantyPASCO scientific warrants the product to be freefrom defects in materials and workmanship for aperiod

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Pasco SF-9500A STUDENT GALVANOMETER User Manual

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