Technicians often use technical Data to help diagnose components.
More often than not the data given for components is the resistance value.
I have a saying "resistance is futile".
This is because you need to disconnect any component to measure its resistance, this is a problem. We need to test under the conditions that the fault occurs.
So why is it, resistance is the only information given to technicians to test components?
The resistance is important information, using ohms law we can calculate the current in the circuit and test under loaded conditions using an amps clamp.
These inductive clamps can be used without interrupting the circuit so testing takes place under the same conditions as the fault occurs.
E.G. A typical petrol injector has a resistance of 14-16 Ohms.
The supply voltage is 12-14 Volts
Therefore the current draw should be in the range 1 - 0.75 Amps.
More often than not the data given for components is the resistance value.
I have a saying "resistance is futile".
This is because you need to disconnect any component to measure its resistance, this is a problem. We need to test under the conditions that the fault occurs.
So why is it, resistance is the only information given to technicians to test components?
The resistance is important information, using ohms law we can calculate the current in the circuit and test under loaded conditions using an amps clamp.
These inductive clamps can be used without interrupting the circuit so testing takes place under the same conditions as the fault occurs.
E.G. A typical petrol injector has a resistance of 14-16 Ohms.
The supply voltage is 12-14 Volts
Therefore the current draw should be in the range 1 - 0.75 Amps.
No comments:
Post a Comment