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SECTION 1 INTRODUCTION
INTRODUCTION
Short circuits and loading problems are a common cause of faults in both Manufacturing and Service.
These faults may range from a low resistance short, such as a solder bridge, to a defective component
loading down a bus line in a microprocessor system.
Different methods are required to locate different types of short.
TONEOHM 950 operating modes
The TONEOHM 950 has five operating modes to enable the user to physically locate any type of short
circuit without lifting components, cutting tracks or otherwise damaging the board under test:
Track Resistance Milliohmmeter for locating low resistance shorts.
Track Current Measures current flowing in a track without breaking the circuit. Used for
stuck bus or device loading problems.
Current Tracer Non-contact current tracing where access to tracks or components is
difficult.
Track Voltage Enables current flow to be traced by measuring the voltage drop caused
by the current flowing in a track. Used when tracing loading faults on very
low resistance tracks.
Plane Shorts Used on multilayer boards to locate shorts between a track and plane, or
between two planes.
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