Samlexpower SAM-250-12 Owner's Manual - Section 2 |
4 | SAMLEX AMERICA INC.
SAMLEX AMERICA INC. | 5
SECTION 2 |
Introduction
SECTION 2 |
Introduction
TheoutputwaveformoftheinverterisaModifiedSineWave.InaModifiedSineWave,
thevoltagewaveformconsistsofrectangularpulsesthatapproximatesinewavepulses
of a Pure Sine Wave. The voltage rises and falls abruptly at a particular phase angle and
sits at 0 Volts for some time before changing its polarity. In a Pure Sine Wave, the voltage
rises and falls smoothly with respect to phase angle and the voltage changes its polarity
instantly when it crosses 0 Volts.
!
caution!
certain devices (few examples given below) may malfunction when powered from modi-
fied Sine Wave. check with the manufacturer of the device for suitability of powering
with modified Sine Wave:
• Devicesutilizingzerovoltagecrossingfortimingcontrol:Someclocksusedin
consumer electronic items (will not keep accurate time)
• DevicesusingmodulationofRFsignalsonAClinesduringzerocrossing
e.g. X-10 System for Home Automation
• DevicesutilizingTriacbasedphasecontrolfortransformerlessvoltagestep
down e.g.:
• Smallbatterychargersforhandtools,flashlights,night-lights,shaversetc.
• Variablemotorspeedcontrolinhandtools
• Lightdimmers
• Temperaturecontrollerse.g.TemperatureControlledElectricBlankets
• Devicesusinghighcapacitancebasedvoltagemultipliersforgeneratinghigh
voltage (will create very high surge currents) e.g.:
• PhotographicStrobeLights
• LaserPrinters
measuring modified Sine-Wave Voltage with a “true rms” Voltmeter
Asmentionedabove,ModifiedSineWavevoltageisatypeofsquarewavethathasanRMS
(root Mean Square) value of 115 VAC in this inverter. A general-purpose AC voltmeter is
calibratedtoaccuratelymeasuretheRMSvalueofaPureSineWaveandNOTofaModified
SineWave.Ifthisgeneral-purposevoltmeterisusedtomeasureModifiedSineWavevolt-
age, it will indicate a lower value (96 VAC to 104 VAC). for accurately measuring the voltage
ofaModifiedSineWave,useavoltmeterwhichisdesignedtomeasure“TrueRMSValues”
like fluke 87, fluke 8060A, fluke 77 / 99, beckman 4410 etc.