Global Specialties PB-505A User manual

User Manual
PB-505A
Deluxe Circuit Design Trainer

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Global Specialties
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451-054-000_rA
© 2021 Global Specialties. All rights reserved.
Unauthorized duplication of Global Specialties documentation materials is strictly
prohibited. Customers are permitted to duplicate and distribute Global Specialties
documentation for internal educational purposes only.
Table of Contents
Symbols and Terms ..................................3
Denitions .........................................3
General Safety Information ............................4
Compliance and Certications ..........................7
Introduction ........................................8
Features & Applications ...............................8
Courseware ........................................9
Description of Individual Features .......................11
Specications .......................................15
Checking out the PB-505A.............................17
Breadboarding Techniques ............................20
Warranty Information .................................21
Service ............................................22

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Symbols and Terms
The following symbols may appear on the product or in the documentation.
Definitions
POLLUTION (P) – addition of foreign matter solid, liquid or gaseous (ionized gases),
that may product a reduction of dielectric strength or surface resistivity.
• Degree 2 (P2) – only non-conductive pollution occurs except that
occasionally a temporary conductivity caused by condensation is
expected.
MEASUREMENT CATEGORY (CAT) – classication of testing and measuring circuit
according to the type of mains circuits to which they are intended to be connected.
• CAT II – measuring circuits connected to utilization points of the low-voltage
mains installation.
Caution Symbol (ISO 7000-0434) – Statements or instructions that must be consulted in order
to nd out the nature of the potential hazard and any actions which must be taken.
A statement calling attention to an operating procedure, practice, or condition, which if not
followed correctly, could result in damage to or destruction of parts or the entire product.
A statement calling attention to an operation procedure, practice, or condition, which if not
followed correctly, could result in injury or death to personnel
Power on. This is the AC mains connect/disconnect switch on the trainer.
Power off. This is the AC mains connect/disconnect switch on the trainer.
This symbol is used to denote an AC signal
This symbol is used to denote the chassis ground
CAUTION
WARNING

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General Safety Information
To avoid personal injury and/or product damage, review and comply with the
following safety precautions. These precautions apply to both operating and
maintenance personnel and must be followed during all phases of operation, service,
and repair of this meter. Before applying power be sure to:
• Read and understand the safety and operational information in this manual.
• Apply all the listed safety precautions.
• Verify that the voltage selector on the back of the unit is set to the correct
line voltage. Operating the instrument at an incorrect line voltage will void the
warranty.
• Make all connections before applying power.
• Do not operate the instrument in ways not specied by this manual or by
Global Specialties.
Failure to comply with these precautions or with warnings elsewhere in this manual
violates the safety standards of design, manufacture, and intended use of the
instrument. Global Specialties assumes no liability for a customer’s failure to comply
with these requirements.
Dry Conditions
WARNING Hands, shoes, oor, and work bench must be dry. Avoid making
measurements with dampness, or other environmental conditions
that might aect safety.
Cleaning
CAUTION Use a soft cotton cloth lightly moistened with a mild solution of
detergent and water. Do not allow any portion to be submerged at
any time. Dry thoroughly before attempting to make measurements.
Do not use solvents or expose to solvent fumes as they may cause
deterioration or damage.
Do not Operate:
• In the presence of noxious, corrosive, ammable fumes, gases, vapors,
chemicals, or nely-divided particulates.
• In environments where there is a danger of any liquid being spilled on the
meter.
• In air temperatures exceeding the specied operating temperatures.
• In atmospheric pressures outside the specied altitude limits or where the
surrounding gas is not air.

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Only for use in pollution degree 2 environments where non-conductive pollution
occurs except occasionally when a temporary conductivity caused by condensation is
expected.
Electrical Power
CAUTION This instrument is intended to be powered from a CATEGORY II
mains power environment. The mains power should be 115 VAC or
230 VAC (±10%) at 50/60 Hz. Use only the power cord supplied with
the instrument and ensure it is appropriate for your country of use.
Slide the switch on the back of the trainer to select the appropriate
input making sure the correct fuse is installed. This trainer consumes
less than 50 W.
Fuse Replacement
WARNING Set the power switch to the OFF or Oposition and disconnect the
power cord before inspecting or replacing the fuse. Open the black
fuse holder (located at the back of the trainer below the input power
receptacle) with a small, at-head screwdriver. Remove the old fuse,
replace it with a new one, and reinstall the fuse holder. Use only 5 x 20
mm type T 1.5 A / 250 V or 0.75 A / 250 V Fuses.
Ground the Instrument
CAUTION To minimize shock hazard, the instrument case must be connected to
an electrical safety ground. This instrument, and the chassis, is
grounded through the ground conductor of the supplied, three-
conductor AC power cable per IEC 60320-1. Do not alter or bypass
the ground connection. Failure to use a properly-grounded approved
outlet and the recommended three-conductor AC line power cable
may result in injury or death. Unless otherwise stated, a ground
connection on the instrument’s front is for a reference of potential
only and is not to be used as a safety ground.
Indoor Use:
This instrument is intended to be used in an indoor pollution degree 2 environment.
The operating temperature range is 0 °C to 40 °C and the operating humidity range is
up to 80% relative humidity with no condensation allowed. Measurement results may
be outside specications if the instrument is used in non-oce-type environments.
Such environments may include rapid temperature or humidity changes, sunlight,
vibration and/or mechanical shocks, acoustic noise, electrical noise, strong electric

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elds, or strong magnetic elds.
Do not Operate:
If the instrument is damaged, appears to be damaged, or if any liquid, chemical, or
other material gets on or inside the instrument, remove the instrument’s power cord,
remove the instrument from service, label it as not to be operated, and return the
instrument to Global Specialties for repair. Notify Global Specialties of the nature of
any contamination of the instrument.
Not for Critical Applications:
This instrument is not authorized for use in contact with the human body or for use as
a component in a life-support device or system.
Do not Touch Live Circuits
Do not Attempt Servicing:
WARNING Instrument covers must not be removed by operating personnel.
Component replacement and internal adjustments must be made by
qualied service-trained maintenance personnel who are aware of
the hazards involved when the instrument’s covers and shields are
removed.
Under certain conditions, even with the power cord removed,
dangerous voltages may exist when the covers are removed. To
avoid injuries, always disconnect the power cord from the instrument,
remove all other connections (for example, test leads, probes, etc.),
discharge all circuits, and verify there are no hazardous voltages
present on any conductors by measurements with a properly-
operating voltage-sensing device before touching any internal parts.
Verify the voltage-sensing device is working properly before and after
making the measurements by testing with known-operating voltage
sources and test voltages. Do not attempt any service or adjustment
unless another person capable of rendering rst aid and resuscitation
is present. Hazardous voltages may be present in unexpected
locations in circuitry being tested when a fault condition in the circuit
exists.

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Use Correctly Sized Wires
CAUTION Use only standard 4 mm banana plugs when connecting to power
supplies.
Solid core wires no larger than 20 AWG must be used for connections
to the solderless breadboards.
Compliance and Certifications
CE Compliance
This product meets the essential requirements of the applicable European Directives
as follows:
2014/30/EU: Electromagnetic Directive (EMC)
2014/35/EU: Low Voltage Directive (LVD)
Standard IEC 61010-1
2011/65/EU + AMD2015/863: Reduction of Hazardous Substances
Directive (RoHS 2)
ANNEX III Exemption 6(c)
Disposal
(Applicable in the European Union and other European countries with
separate collection systems). This product is subject to Directive 2012/19/
EU of the European Parliament and the Council of the European Union on
waste electrical and electronic equipment (WEEE), and in jurisdictions
adopting that Directive, is marked as being put on the market after August
13, 2005, and should not be disposed of as unsorted municipal waste.
Please utilize your local WEEE collection facilities in the disposition of this
product.

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Introduction
The PB-505A Circuit Design Trainer is a versatile, time-saving tool for circuit
designers, engineering technicians, students, and hobbyists. A large breadboard area
and a wide choice of built-in circuit accessories allow rapid and accurate construction
of virtually any type of analog or digital circuit.
Circuit power is provided by three power supplies, two variable and one xed. The
circuit breadboard area includes over 2500 contact points. A multiple-waveform
digital function generator supplies sine, triangle, and square wave output for analog
circuits. A built-in speaker may be used for analog output.
Outputs also include a TTL-level square wave generator, two debounced pushbutton
switches, and a bank of eight logic switches. Eight logic indicators may be used
to display high and low logic levels. Two built-in potentiometers and two SPDT
switches are provided for circuit control and adjustment. Connections to external test
equipment or signal sources may be made using the two BNC connectors on the
front panel.
The PB-505A eliminates the clutter and confusion that often results when
constructing sophisticated circuits. Alligator clips and similar connectors are seldom
needed. Solderless breadboards on the PB-505A allow insertion of components or
wires of up to 20 gauge.
A detailed panel layout and description of the PB-505A is given in the section
“Description of Individual Features”.
Features & Applications
The PB-505A Circuit Design Trainer is a robust electronics trainer suitable for all
levels of electronics instruction and design. Utilizing the PB-505A, students will learn
valuable hands-on breadboarding techniques and build a solid foundation in circuit
experimentation, construction and analysis. Experienced designers will nd the PB-
505A an invaluable instrument, providing a reliable platform for the most advanced
and demanding design applications. The PB-505A can be used to construct basic
series and parallel circuits to the most complicated multi-stage microcomputer
circuits, incorporating the latest in industrial technology. Use the PB-505A to
construct a wide variety of experiments, including but not limited to:
• Opto-Device Circuits
• Clocks
• Multivibrators

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• Oscillator Circuits
• Timers
• Function Generator Circuits
• Logic Circuits
• Gates
• Counters
• Flip-Flops
• Analog-to-Digital Converters
• Digital-to-Analog Converters
• Medium Scale Integration Circuits
• Phase Lock Loops
• Operational Ampliers
Courseware
Courseware is available separately through our website or as part of the PB-
505ALAB package. The PB-505ALAB package oers comprehensive course
instruction covering the following areas:
Electronic
Fundamentals Digital Electronics
Fundamentals of Electricity Number Systems & Codes
Ohm’s Law Binary, Decimal, Hexadecimal, Octal &
ASCII
Series Circuits Logic Gates & Boolean Algebra
Parallel Circuits Combinational Logic Circuits
Combinational Circuits Flip-Flops
Current Control Digital Arithmetic
Closed, open, shorts Counters & Registers
Switches Integrated Circuit Logic Families

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Thevenin’s Theorem TTL Logic
Wheatstone Bridge MOSFETS
Capacitors CMOS
Inductors Interfacing CMOS & TTL
Phase Shift Circuits Medium Scale Integration
Impedance Decoders
Resonant Circuits Encoders
Transformers Data Conversion & Acquisition
Rectiers & Filtering Microcomputer Concepts
Integrated Circuits
Transistor Ampliers
Oscillators
Power Control Circuits