Page 196 - Electromechanical Devices and Components Illustrated Sourcebook

158 Electromechanical Devices & Components Illustrated Sourcebook

Thumb Nut Polarity Tab
Clamping Block
Wire Connection
Brass Washers Dual Dual
Insulating Board
To Circuit
Grounding 90°
Wire Lug
Brass Screw
Brass Nut
Combination Stackable
Figure 9-30 Screw Tight Binding Post
Standard Standard
Figure 9-32 Banana Plugs
(F) Banana Socket

Thumb Nut
BNC Connectors
Connection Shoulder Test Probe Connection
BNC stands for Bayonet Neill Concelman after the man who
designed the connector in the 1940s. It was originally devel-
Insulating Board
oped as a miniature version of the type CRF (type “C” radio
frequency) connector. Over the years it has become the fun-
Brass Washers
Brass Nut
damental connector for test equipment and instrumentation. It
Stud provides excellent RF characteristics, a 500-VDC rating and
particularly good shielding from stray electrical signals. It
Solder Post does not, however, have a very good current-carrying capabil-
Figure 9-31 Combination Binding Post with Banana Socket ity. The connector set has male and female sides and is mated
by pushing the male connector onto the female and rotating
the collar one quarter turn. The collar provides a tactile feed-
back when the locking point is achieved. Figure 9-33 shows a
solder post. These units are very inexpensive and are, defi- few BNC configurations and adaptors. Because the BNC
nitely, the preferred choice for binding posts. connector is so common, adaptors are readily available for
almost every standard connector made.

Instrument and Test Connectors

The two most common connectors in the test and instrumen-
tation world are the banana plug and the BNC connector. Tee Female × Female
These two connectors are found on nearly every piece of test
equipment and on most instrumentation. They both provide a
broad operational range, coupled with extremely durable con- 90°
struction, at a very low cost per unit.
RCA

Banana Plugs Male × Male Banana

Banana plugs are primarily a single conductor plug and jack Alligator Clip
arrangement that provide a high-current, low-resistance con- Rear Leads
Mount
nection in an easy-to-connect package. Figure 9-32 shows a
few banana plug and jack arrangements. Most banana plugs
have a no-solder wire connection that is optimized for stan- Flange Mount Cable
dard test lead wire. Most jacks are supplied with an integral
solder post. Grounding jacks are all metal construction. Dual
Stud Mount Female × Male
banana plugs are set up on 0.75 inch centers and the plug will
carry a polarity tab, as shown. Figure 9-33 BNC Connectors and Adapters