Jaw Design; Body Design - AEMC 3711 User Manual

Ground Resistance Tester Models 3711 and 3731

Jaw Design

The probe head, or jaw, is a key component in the measurement and
overall product performance. Considerable research and development
were dedicated to ensuring its performance, reliability and versatility.
The large jaw has an inner opening diameter of 1.25" (32mm) permitting
use on tight ground conductors on poles and in manholes. The large
opening accommodates not only ground rods, but larger ground
conductors (up to 1000 kcmil) typically found in telecommunication or
railroad applications.
The inner jaw is composed of two independent and individually shielded
magnetic cores permitting the injection of a test signal and accurate
return signal measurement without noise interference or cross talk
common to separate probe instruments.
Thorough mechanical design, including small winglets, ensures repetitive
jaw alignment for accuracy and prevents undesirable insertions into the
jaw spring assembly.

Body Design

The ergonomic body design permits one-handed operation. The guard
provides additional strength, and prevents the hand from slipping or
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coming into contact with conductors under test. The Lexan (or
equivalent polycarbonate) body construction provides strength. The LCD
lens cover may be easily replaced if scratched. The sealed push-buttons
directly access all test functions and are easily operated even with
gloved hands.
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Lexan is a registered trademark of General Electric Corporation.
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