How to Choose the Best Test Probe 

Electrical test probes are used to create a temporary connection between an electrical circuit under test and a measuring instrument, often a digital Multimeter. There are several types of test probes and this short article identifies the different types of test probes, as well as offering guidance on what test probe connector suits your specific application.

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1 - What are Test Probes?

2 - Test Probe Safety and CAT Ratings?

3 - How to Choose your Test Probe

4 - How to Choose your Fused Test Probes

5 - Understand new Test Probe IEC Standards

1 - What Are Test Probes?

Test probes are a useful tool box accessory for any electrical testing or measurement purposes. Test probes can enable the operator to measure; voltage, current, resistances, temperatures and signals. There are many types of probes designed for specific measurement tests and situations, popular types of test probes include;

• Point/Needle/Lantern Tip Point Probes ' Commonly seen as the standard test probe. The needle point tip enables the operator to precisely locate the correct location for testing. Some needle point test probes can pierce cable insulation for testing without causing damage. Connections can also be made through banana connectors for a swift and secure connection (known as back-pinning ' read full article for more information.)
• Hook/Pincer Style Probes ' Test probes with hooks, pincers or grabber style connectors. These probes create a hands-free temporary connection to the component or wire under test with ease. Frequently used in automotive diagnostics and other electrical sectors where the connection point is inaccessible or hand-free connection is essential
• Fused Test Probes ' Feature a built-in fuse within the test probe that provides an additional layer of protection to the individual connecting to a circuit and undertaking an electrical measurement. Fused test probes are used in many high-voltage applications. For more information > Why use Fused Test Probes or Leads?

2 - Test Probe Safety and CAT Rating

Choosing the 'best' probe is about matching your requirements with the test probe specification. It's similar to buying a car, buying a two-seater convertible isn't appropriate if you're a tradesman that needs a van to travel tools and materials.

Assessing the electrical circuits and intended application is a good place to start before buying test probes. The CAT rating concept is linked to the distance you are from the source of the supply. The closer to the source, the higher the CAT Rating you need to perform any electrical testing. Using Fluke's guide on CAT Ratings is a useful point of reference;

Measurement Category Description Examples CAT IV

Three-phase at utility connection, any outdoor conductors

Limited only by the utility transformer feeding the circuit

''50 kA short circuit current

• The "origin of installation"'where low-voltage connection (service entrenc cables) is made to utility power.
• Electricity meters, primary overcurrent protection equipment.
• Outside and service entrance, service drop from pole to building, run between meter and panel
• Overhead line to detached building, underground line to well pump.

CAT III

Three-phase distribution, including single-phase commercial lighting

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'50 kA short circuit current

• Equipment in fixed installations, such as switchgear and polyphase motors.
• Bus and feeders in industrial plants.
• Feeders and short branch circuits, devices fed directly from distribution panels.
• Lighting systems in larger buildings.
• Appliance outlets with short connections to service entrance

CAT II

Single-phase receptacle connected loads.

'10 kA short circuit current.

• Appliances, portable tools, and other household and similar loads.
• Outlet and long branch circuits.
• Outlets at more than 10 meters (30 feet) from CAT III source.
• Outlets at more than 20 meters (60 feet) from CAT IV source.

3 - How to Choose Your Unfused Test Probe?

Once you've identified and assessed the CAT Rating required for your application you can narrow your test probe search. Remember the length of the test probe tip (exposed metal) typically signifies the CAT Rating. The shorter the tip the less likely of an accidental arc (CAT II ' 19mm Test Probe Tip - CAT III and IV ' 4mm Test Probe Tip).  

CAT II V

Test probes suitable for; appliances, portable tools, and other household items;

CAT III V / CAT IV 600V

Test probes suitable for; three-phase distribution, including single-phase commercial lighting

CAT IV V

Test probes suitable for three-phase at utility connection and any outdoor conductors

4 - How to Choose your Fused Test Probe

Fused Test Probes protect the operator from harm. Electrical Test Instruments like digital multimeters are protected internally by high intensity fuses and clearance distances appropriate to the installation category and voltage ratings of an instrument. The fused test probes are sold with a specific fuse installed. The test probes are printed with the voltage and current related to the specifications of the chosen fuse and according to EN / IEC -031:. The current value is the fuse rated current. The voltage value is the voltage of the probe plus fuse combination.

CAT II V - Fused Test Probes

Test probes suitable for; appliances, portable tools, and other household items. There are many fuses available with different voltage and Amp ratings. Ensuring your fuse ratings are suitable for your circuit or appliance is essential before connecting and running measurement tests. 

CAT III V / CAT IV 600V

 Test probes suitable for; three-phase distribution, including single-phase commercial lighting

5 - Test Probes Updated IEC Standards

Whether you're using an oscilloscope or a Multimeter, having the correct probe is important not only for measuring, but for the safety of the test.

The latest standards BS EN -031: came into force July . It specifies safety requirements for hand-held and hand-manipulated probe assemblies and their related accessories. The amended safety standard was enforced to offer test probe operators improved safety when electrical testing.

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