This slide show will help you to understand Test Probe.

2. • A test probe is a physical device used to connect electronic test equipment to a
device under test (DUT).
• Spring contact probes are typically made of a plunger, a barrel and a spring.
• All components must be manufactured with the type of precision, which is demanded
by the micro-electronics industry.
• All barrels are usually tin or gold plated. A small hole in the bottom permits the
barrels to be thoroughly cleaned during manufacturing and ensures continuous
wetting in the plating process.
• The Barrel accommodates the plunger and the spring.
• The actual measurement signal flows via the barrel to the Receptacle.
• To improve the smooth movement, after gold plating the barrel is treated with a very

3. • The Spring provides the necessary contact pressure, and this even after
several hundred thousand strokes (testing cycles).
• The specified spring-forces are reached with the recommended working
stroke and are subject to a tolerance range of +/- 10 –15%; this being due
to the parameter restrictions when designing and manufacturing springs
for such small components.
• For easy measurement of the spring forces, common spring-force
measuring gauges are used.
• The Plunger with the contacting zone is available in a large choice of tip-
styles.
• It must provide the smallest possible contact resistance between the Test
Probe and test point, to ensure that measurement results are not
distorted.
• The most common plunger materials are Steel and BeCu-both of which are
hardened. For very passive tip-styles brass is also used.

4. TEST
PROBES/PIN/POINTS
ICT/FCT
probes for
test fixtures
Short Travel
Probes
Interface
Probes
Probes with
rolling ball
Pneumatic
Probes
Threaded
Probes
High Current
Probes
Switch
Probes
Push Back
Probes
Radio
Frequency
Probes

5. Concave Conical Head 90° Conical Shaft 30° Conical Shaft 60° Conical Shaft 90°
4 point Crown Shaft Flat Head Flat Shaft Half Crown Half Moon
Hexagonal Head 90°Rigid Needle Head 15°Serrated head Spherical head Triangular head 45°

6. • Versatility of mounting and profile
• Blind mate
• Extremely high density
• Low, consistent resistance
• Reliable contact when exposed to shock, vibration, and acceleration
• Consistent performance, first stroke, every stroke
• Million-cycle mechanical lifetimes

7. • In medical equipment’s
• For aerospace applications
• In consumer electronics
• In automotive industries
• For military applications

8. • Author Nalin P. Sheth, MBA Harvard, is Managing Director of
Champion Electronics Pvt. Ltd., Pune,411026, India.
• Champion Electronics is serving electronics industry all over the
world from 1975.
• Contact Details :
• Email : sales@champelec.com
• Ph: +91-8928502180.
• Website : www.champelec.com