How to Check a Resistor
In order to test a resistor, it is important to first disconnect one lead from the circuit .. it won't matter which one., Next, obtain an electrical meter capable of measuring resistance., You will next need to determine the rated value of the...
Step-by-Step Guide
-
Step 1: In order to test a resistor
This is typically called an ohm-meter, and is almost always a function of a standard multi-meter. , With the colored band variety, you will need to look up each colored band and determine its meaning.
The first two bands will be single digit numbers, followed by the third band which is a multiplier.
The fourth band will be an accuracy rating for the device.
For example: band1=1 band2=0 band3 = x100 band4 = 5%; would mean 1000ohms +- 5%.
The ceramic and wire varieties will often be labeled in ink with a value.
The carbon/metal variable resistors will not usually have a stated value labeled, but you can look for a smooth transition as adjustment is made to the wiper position. ,, It should be near the given value and within the tolerance range. , -
Step 2: it is important to first disconnect one lead from the circuit .. it won't matter which one.
-
Step 3: obtain an electrical meter capable of measuring resistance.
-
Step 4: You will next need to determine the rated value of the resistor.
-
Step 5: Set your meter to an appropriate range(nearest value higher than the expected measurement)
-
Step 6: and connect the leads(polarity will not matter).
-
Step 7: Compare your reading with the value determined above.
-
Step 8: If it is
-
Step 9: its likely good - otherwise not.
Detailed Guide
This is typically called an ohm-meter, and is almost always a function of a standard multi-meter. , With the colored band variety, you will need to look up each colored band and determine its meaning.
The first two bands will be single digit numbers, followed by the third band which is a multiplier.
The fourth band will be an accuracy rating for the device.
For example: band1=1 band2=0 band3 = x100 band4 = 5%; would mean 1000ohms +- 5%.
The ceramic and wire varieties will often be labeled in ink with a value.
The carbon/metal variable resistors will not usually have a stated value labeled, but you can look for a smooth transition as adjustment is made to the wiper position. ,, It should be near the given value and within the tolerance range. ,
About the Author
Dorothy Green
A passionate writer with expertise in practical skills topics. Loves sharing practical knowledge.
Rate This Guide
How helpful was this guide? Click to rate: