HITEC PMAC 3000 - Analog Output

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PMAC 3000 Page16
AnalogOutput
TheAnalogOutputisavailabletotheuserviatheBNCconnectorontherearofthePMAC3000.
SeeFigure1.Thecenterconductoristheanalogsignal,andtheoutershellistheanalogcommon.
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Theanalogoutputistied,viasoftware,directlytothesensorinput.Itis
ascaledreflectionofthe
liveloadonthesensorasapercentageofthesensorfullscalecapacity.
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TheoutputrangeoftheAnalogOutputisuserselectableintheMenutooneoffourranges.The
ranges are, +/‐10V, +/‐5V, 0‐10V and 0‐5V.See
Figure 13.In any case, these user selectable
rangedreflecttheoutputvalueoftheAnalogOutputwhenfullscaleloadisappliedtothesensor.
Theentire rangeofthe sensor,frompositivefullscale,tonegativefullscale,isaccountedfor.
Thismeansthatzeroloadonthesensorwillproduce0Voutputfor+/‐10Vand+/‐5Vranges,5V
forthe0‐10Vrange,and2.5Vforthe0‐5Vrange.Theanalogoutputusesthefull16bitsofthe
digitaltoanalogconverter(DAC)resolutiontoproducethe+/‐10Voutput.The+/‐5Vand
0‐10V
rangesareproducedusing15bitsofDACresolution.The0‐5Vrangeisproducedusing14bitsof
DACresolution.
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Figure13–AnalogOutputSettingsScreen
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TheAnalogOutputmaybeturnedoffbychoosingtheDisabledselectionontheAnalogOutput
Settings screen.Turning off the  Analog Output when not needed will increasebattery life by
about10%.
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TheAnalogOutputiselectricallyisolatedfromthePMAC3000.Whenmeasuringthisoutputwith
a data
acquisition system, it may be necessary to connect the signal common to a ground
referenceonthedataacquisitionsystemto insure that the commonmodeinput rangeof the
dataacquisitionsystemisnotviolated.
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