A Leading South African Test and Measurement Instruments Supplier

“For Good Measure”®

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Product List


Test and Measurement Instruments C.C.

          CK 1985/007464/23

“Tomorrow’s Instruments Today”  —  “For Good Measure” ®

TMI, Established—1982

English, Afrikaans, Portuguese Speaking.                         Master/Visa Credit Cards

Power Supplies

Power Supplies

Single Output Power Supplies

A Range of Single Output Power Supplies, with Variable  Voltage, Current Limiting, Digital Displays, Analog Displays etc.

Single Output Power Supplies
Dual Output Power supplies

Quad Output Power Supplies

A Range of Quad Output Power Supplies, with Variable  Voltage, Current Limiting, On/Off Presets, Digital Displays etc.

Quad Power Supplies

Triple Output Power Supplies

A Range of Triple Output Power Supplies, with Variable  Voltage, Current Limiting, On/Off Presets, Digital Displays etc.

Triple Output Power SuppliesQuad Power SuppliesTriple Output Power SuppliesSingle Output Power SuppliesDual Output Power supplies

Notes on Power Supplies.

A Power supply is an equipment that produces AC or DC power.  This grouping includes current sources, DC power supplies including Agilent Power Supply, AC-DC adapters, DC-DC converters, AC power sources, and DC-AC inverters. Current sources provide reliable current for electrical component testing and for powering specialized components.  DC power supplies accept AC input and provide one or more DC outputs for a wide variety of computer and industrial applications. The output Power can be measured with a DC Power Meter. AC / DC adapters accept AC input voltage directly from a wall outlet, and output DC voltage. DC-DC converters accept DC input and provide regulated DC outputs for computers, telecommunications, and process control applications. AC power sources provide alternating power and will typically have adjustable output values for the testing of component response at various voltage, current and frequency levels. DC to AC power inverters are used for converting direct current (DC) into alternating current (AC). They are also known as DC to AC converters.  Rectifiers accept AC input and provide one or more DC outputs for a wide variety of computer and industrial applications.  Style, output, display, application, and features are all important to consider when specifying power supplies.

Choices for power supply style include ATX, board, cabinet, desktop, DIN rail, module, open frame, enclosed, PCB mount, rack mount and wall mount.  Important output specifications to consider include number of outputs, DC output voltage, DC output power, AC output voltage, AC output frequency and apparent power.  Common choices for DC output voltage include 3.3 V, 5 V, 12 V, 15 V, 24 V, and 48 V.  The DC output power is the output power of the device.  Power supplies can also have an AC output voltage as well as AC output frequency.  Apparent power is the product of the RMS current and the RMS voltage of the AC output, it is identical to the VA rating.

Display choices include analog visual indicators, digital numerical displays, and graphic or video displays.  Common applications for power supplies include computer, high current, high frequency, high voltage, instrumentation, laser, magnetic, medical, military, plasma, telecommunications, and testing equipment.  Common features for power supplies include adjustable voltage, adjustable frequency, computer interface, fan cooled, integral heatsink, overcurrent protection, overvoltage protection, power factor correction, pure sine output, remote on or off switch, short circuit protection, and water cooled.  An important environmental parameter to consider when specifying power supplies is the operating temperature.

Copyright  © 2009—2022 Test and Measurement  Instruments C.C.   |  All rights reserved

DC Power Supply

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Dual Output Power Supplies

Dual Output Power Supplies are available, but we stock Triple Output supplies due to the negligible price difference versus practicality.

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High Voltage & Current Output Power Supplies

A Range of High Voltage and Current Output Power Supplies, with Variable  Voltage, Current Limiting, Digital Displays, etc.

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Brand Names



Air Quality Meters

Alcohol Breath Tester

Alignment Equipment

AM & FM Signal Generators


Appliance Testers

Audio Generators

Audio Impedance Meter


Automotive testers



Batteries for Equipment

Battery Analyser /

Battery Desulphator Charger

Bench DMM’s


Bread Boards

Breath  Alcohol Tester

Cable Fault Locators

Cable Height Meter

Cable Testers


Capacitance meters

Carbon Dioxide meters

Carbon Monoxide meters

Car Testers

Caster / Camber Gauges

Chlorine Meter

Clamp meters

Clearance Sale:

Colour Analysers

Combination Combo Meters

Concrete Testing

Conductivity  / TDS meters

Contact Tachometers

Continuity Tester

Controller / Monitors

Corner Weight Scales

Coronavirus COVID-19

Current Meters, Bench Type

Data Acquisition Systems

Data Loggers

Decade Boxes

Dew Point Meters

Digital Vernier Calipers

Digital Scales

Digital Multimeters , DMMs

Dissolved Oxygen Meters

Distance Meters

Drain Pipe Camera

Drug Testing

Dust Monitoring

Earth resistance meter

Earth Leakage Tester, ELCB

Educational Systems

Electrical Connectors

Electromagnetic Field Testers

Electrostatic Field Tester

EMF tester

Explosives Testing

Eye Tracker

Field Strength Meters

Force gauge

Frequency Counter

Function Generators

GSM Controller

Gas leak detector

Green Hybrid Power

Grid Dip Meter

Hardness tester

Helicopter IR Gimbals

HV(High Voltage) Testing

Humidity meter


Inductance Decade Box

Infrared Thermometers

Infrared Thermography


Insulation tester

Laser Levelling

LCR meter

Leakage Clamp Meters

Logic Analyser

Logic Probes/Pulsers

Lux meter, (Light meter)


Metal Detector


Micro-Ohm Meters

Microwave Leakage

Milliohm meter


Moisture meter


Night Vision Equipment

Optical Gas Imaging OGI Thermal Cameras

ORP meter


Oxygen Meters

Pattern generators

Panel meter

PC-Based Instruments

Pen type tester

pH Meters and Probes

Pipe Inspection Camera

Photo Tachometer

Power analyzer

Power clamp meter

Power Supplies

Pressure/Vacuum meter

3 Phase Rotation Tester

Pressure Transducer

Probes, Oscilloscope

Protection Relay Testing

Proximity sensor

Racing Equipment

RCCB tester

RCD, RCCB Testers

Radiation Testers


Renewable Energy

RF Generators

Resistance Decade Box

Roughness tester


Salt meter

Satellite Testing Equipment


Scales, Digital

Shore Hardness Tester


Soil Moisture Meters

Soil pH meter

Solar Power Meter


Sound level meter

Spectrum Analyser


Student Bench Meters

Stun Guns

SWR / RF Power Meters


TDS / Conductivity Meters

Test Leads

Thermal Cameras– Long Distance –20Kms

Thermal Imagers



Thermography Courses

Thickness Testers

Tone Generator/ Tracer

Tools - Hydraulic Crimp

Torque meter

Torque wrench

Transformer Testing

Transient Suppressors


TV & Satellite Meters

Turbidity Meter

Ultrasonic Flaw Detector

Ultrasonic Thickness

UV Corona & IR Cameras, Combined

UV light meter

Vacuum meter

Variable Transformers

Verniers, Micrometers

Vibration meter

Video Scope

Watt meter

Water Tester

Water Testing Meters

Weather Station

Vacuum/Pressure meter

Voltmeters, Bench Type

Voltage Detectors

Voltage Regulators

5 Way® Binding Posts

Voltage Stabilisers

XRF Analysers

All brands, trade names, trade marks, and logos are the property of their respective owners.

T + M®                      




Time Group




Superior Electric


S.E.W. Standard Electric Works

Ph:   +27 (011) 683 4365 / 6 / 7

E-mail: sales@instrumentsgroup.co.za






Physical   Address:              

3 Angelica Ave,

Glenvista, Johannesburg, 2091



Postal Address:

As Above.

011 683 4365
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