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VERSON 1.0 TPR 2009
Safety Ohmmeter
C003.02.03/ 16
VERSON 1.0 TPR 2009
Objective
You will be able to demonstrate an understanding of Avionic circuit testing with
regards to the safety ohmmeter.
C003.02.03/ 16
VERSON 1.0 TPR 2009
AGISAFETY OHM METER 1661 RANGE (ohms)
200m
2
20 200
2k
20kWarning: Do not connect to powered circuit
BASEEFA No: Ex 91C2167
EEx ib C T4
Ex
MOD. RECORD
ON
LIGHT
LEAD 1 LEAD 2
NSN 6625-99-751-1000 Serial 00AG-516
1 2 3 4 5 6
OFFSET
C1
P1
C1
P1
Safety Ohmmeter
C003.02.03/ 17
VERSON 1.0 TPR 2009
Bonding Testing
Bonding means ‘to tie’, ‘connect’, ‘join together’ or to ‘form a single unit’
C003.02.03/ 17
VERSON 1.0 TPR 2009
Safety Ohmmeter
Pre-Use Checks
C003.02.03/ 18
VERSON 1.0 TPR 2009
BatteryAircraft
structureAircraft structure
ON OFF
Earthing & Bonding
The metal airframe is used as the ‘negative return path’ for aircraft electrical circuits.
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VERSON 1.0 TPR 2009
Earth Points
C003.02.03/ 17
VERSON 1.0 TPR 2009
Objective
You will be able to demonstrate an understanding of Avionic circuit testing with
regards to the safety ohmmeter.
C003.02.03/ 16
VERSON 1.0 TPR 2009
Summary
What do we mean by the term bonding in terms on aircraft electrical systems?
It is the interconnection of conducting parts of an aircraft to ensure the safe distribution of electrical charges and currents.
VERSON 1.0 TPR 2009
Summary
What electrical quantity does a Safety Ohmmeter measure?
Resistance – (primarily very low resistance).
What are the two functions of the Safety Ohmmeter?
Perform aircraft electrical bonding checks
Perform resistance checks on sensitive electronic circuitry
VERSON 1.0 TPR 2009
Summary
The Airframe should form a Low Resistance path to allow it to:
Be safely used as an “earth return system” under normal and fault conditions.
Ensure that electro static charges cannot build up between adjacent panels.
Minimize the damage to the aircraft structure and components in the event of a lightning strike.
VERSON 1.0 TPR 2009
Any Questions?
