Section 4
MEASURING ELECTRICITY
MEASURING AC FREQUENCY
The generator's AC output frequency is proportional to Rotor speed. Generators equipped with a
Correct engine and Rotor speed is maintained by an engine speed governor. For models rated 60 Hertz, the governor is generally set to maintain a
MEASURING CURRENT
To read the current flow, in AMPERES, a
Current flowing through a conductor may be mea- sured safely and easily. A
Figure |
Figure 4-3. – A Line-Splitter
NOTE: If the physical size of the conductor or ammeter capacity does not permit all lines to be measured simultaneously, measure current flow in each individual line. Then, add the Individual readings.
MEASURING RESISTANCE
The
When testing Stator windings, keep in mind that the resistance of these windings is very low. Some meters are not capable of reading such a low resis- tance and will simply read “continuity”.
If proper procedures are used, the following condi- tions can be detected using a VOM:
❏A
❏Shorting together of any two parallel Stator wind- ings.
❏Shorting together of any two isolated Stator wind- ings.
❏An open condition in any Stator or Rotor winding.
Component testing may require a specific resistance value or a test for “infinity” or “continuity.” Infinity is an OPEN condition between two electrical points, which would read as no resistance on a VOM. Continuity is a closed condition between two electrical points, which would be indicated as very low resistance or “ZERO” on a VOM.
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