Test Products International (TPI)

- TPI is known by many professionals as the "Safety Green Meter Company". Our safety green instruments are easily recognizable and stand for Value and Safety. Most products are Listed to US and Canadian standards (cULus) and are backed by a 3 year, no hassle warranty. More...

The TPI product line includes Digital Multitesters, Digital Clamp-on Testers, Thermometers, Oscilloscope Probes, Connector Kits, Test Lead Sets and Accessories, Gas Analysis Instruments, Hand Held Oscilloscopes and BNC Cables. Collateral materials and repair centers at every location. Less...

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Go To Product Training Module Index Page

Digi-Key’s library of more than 2000 exclusive PTM Online… On Demand® product training modules is a collection of training tools created with you – the busy design engineer – in mind. They are provided with the cooperation of participating supplier partners. From this one source, you can learn about the latest products and technologies, download datasheets, check inventory, contact our technical staff, and place an order for same-day shipment.

These modules are available in audio and non-audio formats and listed by supplier in easy-to-find alphabetical order. Simply locate the module that interests you and click on your format of choice. We hope you find these tools useful, and with new modules added continuously, we invite you to stop back often to see what’s new.

Product Training Modules Online...On Demand® is a registered trademark of Digi-Key Corporation.

Updated PTM = Updated Product Training Module - PTM        New PTM = New Product Training Module - PTM

Module NamePreviewAudioNon-AudioDurationParts List
  • 440 DMM-Scope
4.3MB1.2MB10 minParts List
  • 460 Handheld Oscilloscope
4.5MB1.7MB10 minParts List
  • Modular Test Leads
4.7MB2.2MB10 minParts List

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Product Information

715K3 High CO & NOX Analyzer Kit

Brochures and Catalogs

Full Line Catalog
Instrument Catalog

Frequently Asked Questions

Oscilloscope Probes FAQ's

Why is common rejection ratio (CMMR) important for differential probes?
CMMR is a measure of how well a differential probe will reject signals common to both test points, leaving the desired signal to be displayed by the scope.

What is the benefit of a probe with X1 and X10 switchable attenuation?
Passive X10 probes allow you to read a signal 10 times the amplitude of that viewed with a X1 probe. Example: an eight-division graticule on 5V/Div setting would display a 40 volt peak-to-peak signal using the X1 setting. You can view a 400 volt signal using the X10 setting.

Why do TPI oscilloscope probes have a compensation range and compensation adjustment?
Since the input of every oscilloscope is different our probes have a compensation adjustment so the capacitance of the probe can be adjusted to match the capacitance of the scope input. The compensation range is the range of adjustment available. Matching probe and scope capacitance is important to prevent waveform distortion.

Test Leads FAQ's

What are important specifications when considering test leads?

Strands of wire
•  The more strands of wire in a test lead, the more flexible it typically is.
•  Higher strand count increases test lead life.
•  TPI silicone insulated test leads offer higher strand counts than PVC insulated leads.
PVC Insulated test leads
•  Durable low cost lead.
•  Useful for general test and measurement applications.
Silicone Insulated test leads
•  Most durable test lead.
•  Double insulated for safety. When half the insulation is worn away or when a lead is nicked or cut, you will see a white strip.
   This strip indicates half the insulation is gone and the lead should be replaced.
•  Flame retardant. PVC test leads will burn or melt when exposed to heat.
•  More flexible than PVC leads.
•  Typically carry agency approval such as: cULus and IEC category ratings

Tech Tips

Oscilloscope Probes & SMTP Clips TECH Tips:

Several important factors must be taken into account when selecting the proper probe:

•  The probe should have sufficient bandwidth and rise time for the test instrument and application. Choose a probe with at
   least an equal bandwidth as the scope it will be used with. For best performance a probe with twice the bandwidth as the
   scope should be selected.
•  For oscilloscope probes, the input capacitance of your oscilloscope should be within the compensation range specification of
   the probe. In addition, if your oscilloscope has readout function, select a probe with this capability.
•  For differential probes, make sure the maximum differential voltage is adequate for your application and the common
   mode rejection specification meets the requirements of the tests being performed.


•  Attenuation: Ratio of the output signal to the input signal. Attenuation should remain constant decreasing by 3dB only as the
   frequency increases to the maximum bandwidth.
•  Bandwidth: The maximum -3dB frequency that can be expected.
•  CMRR (Common Mode Rejection Ratio): A measure of a differential probes ability to reject any signals common to both test
   points in a differential measurement
•  Compensation Range: The range a probe can be compensated to match the input capacitance of the test equipment it is
   being used with.
•  IEC 1010: Probes with the IEC 1010 category rating have been designed for safety.
•  Input Impedance: The total resistance and capacitance as measured at the tip of the probe. This specification is used to
   define the loading effect of a probe. At frequencies under 1MHz the input resistance of the probe will have the most
   influence. At higher frequencies the input capacitance will have the most influence.
•  Readout: Probes with this capability are compatible with readout function oscilloscopes that automatically detect and display
   the attenuation factor of the probe.
•  Rise Time: The time required for the leading edge of a pulse to rise from 10% to 90% of its final value.

Technical Notes

More about Test Products International (TPI)

Test Products International, Inc. (TPI) was incorporated in Oregon (USA) June 3, 1997 and purchased the assets of Test Probes, Inc. of San Diego, California. Test Probes, Inc. supplied oscilloscope probes and test leads to the electronics market. Soon thereafter, the product line was expanded to hand held test equipment and Safety Green was selected as the color for TPI instruments. Safety Green is easily recognizable and is a color that symbolizes safety, which is an important element of hand held electrical test equipment. This expansion also gained TPI access to additional market segments.

The TPI product line now includes digital multimeters (DMMs), digital clamp-on meters, gas products (combustion, combustible gas, and CO), portable oscilloscopes, digital manometers, IAQ instruments, thermometers, oscilloscope probes, coax cable connector kits, test lead sets, and BNC cables.

Test Products International Europe in the United Kingdom was founded in July 2001 and Test Products International Ltd. in Canada was founded in December 2002. These are wholly owned subsidiaries of Test Products International, Inc. offering the same product lines and services. This enables TPI to service its customers globally.
Test Products International (TPI)
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