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Sine wave

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Posted by mark Ransley on October 10, 2003, 1:28 pm
I have a generator 7500 generac. How do i check sign wave, what do i
need, What is sign wave  and what is good sign and how can it damage

Posted by Zathera on October 10, 2003, 3:06 pm

Do look at the sine wave your going to need an oscilloscope.  That is really
not necessary for the average guy. Because the sine wave looks different
during different loads and situations.

Get a meter (volt, ohm meter some times called a Vom) that reads hertz and
set the gen set with 20-50% load to 60 hz and you will be fine assuming that
your on North America. Europe is mostly 50hz.  This will be done with the
speed governer, check your manual for exactly how.

If the cycles are not close to what the electronics need then they can draw
more power. Clocks and items with clocks do not like hertz other that want
they expect.

Posted by Howard Epstein on October 14, 2003, 2:06 am
 A VOM will not set the frequency. An oscilloscope or frequency meter is
required.  If you calibrate the oscilloscope the frequency can be measured by
the time period (on the horizontal axis).  A time period is 1/F or 1/60 = 16.6

On another subject anybody know how to test the system board on a Generac
Generator ?


Howard Epstein

Zathera wrote:

Posted by mark Ransley on October 14, 2003, 2:07 am
 A -- Kill   A  Watt -- , will ,, at  radioshack, a monitoring devise  of
total  kwa , hrs  , watts  etc in memory,     made   to figure
appliance consumption.  per month  or longer

Posted by Steve Spence on October 16, 2003, 9:35 pm
 AC producing rotary generators produce sine wave of a certain frequency.
that frequency is determined by rpm. you will need a frequency counter to
tell if your governor is holding the generator at the correct frequency. The
poles of the generator determine the speed that the engine needs to run at
to provide a certain frequency. Most common are 2 pole and 4 pole. In the
USA, it's 60hz (3600 or 1800 rpm), in many other countries it's 50hz (3000
or 1500).

Some inverters produce a modified square wave that approximates sine wave,
others produce a square wave that can cause havoc with motors and some

Steve Spence

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