The output waveform of this inverter is a modified sinewave (see page 12)
NOTE: A sine wave rises and falls smoothly (at a slope) and also crosses 0V instantly at
a slope. A modified sinewave rises and falls abruptly (no slope) and also sits at the 0V
level for sometime before crossing over abruptly (no slope). Thus, any appliance that
uses a control circuitry that is required to sense a slope and/or instant zero crossing will
not operate correctly with a modified sinewave. Examples of such appliances are given
below:
• Some models of appliances that have built-in clocks, such as clock radios,
alarm clocks, coffee makers, breadmakers, VCR and microwave ovens may
not keep time correctly.
• Most devices with variable speed such as electric drills may work irrationally
when operating with modified sinewave. The variable speed control may not
work, and the unit may work only at full speed.
CAUTION:
CERTAIN BATTERY CHARGERS FOR CORDLESS BATTERY OPERATED TOOLS,
FLASHLIGHTS, VIDEO CAMERAS AND LAPTOP COMPUTERS MAY GET EXCES-
SIVELY HOT AFTER 10 TO 15 MINUTE OF USE. THESE CHARGERS SHOULD NOT
BE POWERED FROM THIS WAVEFORM.
POWERING TELEVISION AND AUDIO EQUIPMENT
Although the inverter is shielded and filtered to minimize signal interference, some
interference with your television picture may be unavoidable, especially with weak
signals. However, here are some suggestions that may improve the reception.
1. First, make certain that the television antenna produces a clear signal under normal
operating conditions (i.e., at home plugged into a standard 117 AC wall outlet). Also,
ensure that the antenna cable is properly shielded and of good quality.
2. Change the relative positions of the inverter, antenna cables and television power
cord.
3. Isolate the television, its power cord and antenna cables from the 24 volt power
source by running an extension cord from the inverter to the television set.
4. Coil the television power cord and the input cables running from the 24 volt power
source to the inverter.
5. Attach a "Ferrite Data Line Filter" to the television power cord. More than one filter
may be required. These filters are available at most electronic supply stores includ-
ing Radio Shack.
Note :
Inexpensive sound systems may emit a "buzzing" sound when operated with the
inverter. This is due to inadequate filters in the sound system. There is no solution to
this problem short of purchasing a sound system with a higher quality power supply.
APPLIANCES THAT MAY NOT OPERATE
CORRECTLY ON MODIFIED SINEWAVE
Page 11
