| The "D" Cell test determines armature
winding resistance in ohms of your motor. It is perfect for
beginning enthusiasts with limited budgets, basic electrical equipment
and surplus motors without specification sheets.
Because the armature resistance is very low the
measurement cannot be done with your conventional ohm meter so we
devised this test to be done with a 5, 10, or 20 amps Full Scale Amp
meter. This can be the Amp setting on some Multi-Meters or a
cheapie automotive or surplus meter under $10.00. A brand
new fresh Alkaline "D" Cell battery and a method of rigidly mechanically
locking the shaft of the motor so it does not rotate is also required.
Do not use your fingers.
To make the test:
1. Lock the shaft
2. Briefly for 1-3 seconds connect the motor, battery and
meter together in series.
3. Quickly read the Amp meter. The "D" cell is very
quickly discharged in this test and after 5 or 10 seconds will not yield
accurate results.
The resistance could be calculated from the Amperes
and 1.5 volts of the "D" cell using ohms law but VANTEC has saved
you the trouble and even factored in sneaky variables such as the
batteries internal resistance. The
Competitive 'bot Selection Guide is calibrated in "D"
cell Amps read as is the RDFR speed control brochure
SELECTOR CHART. |
