3b-scientific Resistance Bridge User Manual download pdf

3B SCIENTIFIC

PHYSICS

Resistance Bridge 1009885

Instruction sheet

01/13 ALF

1 Plastic base

2 Connection sockets

3 Rail with scale

4 Resistance wire

5 Slide contact with pointer

1. Safety instructions

• Do not exceed a maximum permissible volt-

age of 8 V.

• Do not exceed a maximum permissible cur-

rent of 1.5 A.

2. Description

The resistance bridge is used in determining the

resistance in bridge circuits as well as in investi-

gating the voltage drop along a wire.

The device consists of a rail with scale mounted

on two bases with a resistance wire. A slide

contact, is attached on top of the resistance

wire. This defines the resistances R

and R

(see Fig. 1).

3. Technical data

Dimensions: approx. 1300x100x90 mm³

Rail: approx. 30x30 mm²

Scale: 0 – 1000 mm

Scale divisions: mm

Resistance wire: 1 m, 0.5 mm diam.

Material: NiCr

Resistance: 5.3 Ω

Connection: 4 mm safety jacks

Maximum voltage: 8 V

Maximum current: 1.5 A

4. Operating principle

In order to determine a resistance a Wheatstone

bridge circuit is set up (see Fig. 1).

To do this a resistance wire of length l = l

+ l

and with specific resistivity ρ (Ωm) is connected

into a circuit consisting of the resistor R

to be

measured and a known resistor R

. A DC volt-

1 2 3 4

3B SCIENTIFIC 1
PHYSICS 1

Summary of Contents

Page 1 - PHYSICS

3B SCIENTIFIC® PHYSICS 1 Resistance Bridge 1009885 Instruction sheet 01/13 ALF 1 Plastic base 2 Connection sockets 3 Rail with scale

Page 2

2 age U is applied to this circuit. The ammeter is used to measure the current flowing between the point D and the moveable tapping point C located on

Page 3

Page 4

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3b-scientific Resistance Bridge User Manual

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Summary of Contents

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