Omega Vehicle Security OM-550 manual

4.14.5 MATCHING AND SCALING A VOLTAGE TRANSDUCER

EXAMPLE: Given a 20 - 90 % RH (Relative Humidity) transducer with a 0 - 10 VDC output at a maximum current of 3 mA.

Program the OM-550 to indicate 20.00 %RH to 90.00 %RH (that is, to indicate %RH with 0.01% resolution).

If a ±10 Voltage Probe is being used, begin with step 3, below. (This probe is already matched to the OM-550).

1.First, find the Matching resistors: I = 1/2 maximum current

=0.003 / 2

=0.0015 Amps

R1	= 2 / I	R2 =	(V - 2) / I
=	2 / 0.0015	=	(10 - 2) / 0.0015
=	1333 Ω	=	5333 Ω
2. Check:
V=	(R1 + R2) * I	V =	R2 * I
=	(1333+5333)*1.5 mA	=	1333*1.5 mA
=	9.999	=	1.9995
=	10	=	2

With these matching resistors the OM-550 will see a max 2 VDC at the Transducer max output of 10 VDC.

OM-550

u35u

Image 40

Omega Vehicle Security OM-550 manual Matching and Scaling a Voltage Transducer

Contents

Table of Contents Date Time Introduction ∙ The OM-550 Datalogger may be referred to as Logger Operator Safety Information Product Usage Warnings For protection of the OM-550 itself, observe the following Unpacking OM-550 Features FeaturesOM-550 features Activity LED & Horn Keypad ∙ ON-OFF ∙ RUN ∙ PROG/EXIT ∙ Stop∙ OK ∙ Optional Connectors Channel ConnectorsApplication Printer Window To remove the Viewing Window Battery Cover Thermal PaperDC Jack Serial Data Port Gain Adjust Tilt Stand Power Supplies Inputs Voltage Transducer InputsProbes Probe SET Thermocouple Inputs Type Programmed Features Data Cache Statistics LOW Battery Operation POWER-SAVE ModeBattery Check Power Connection Battery Installation Connecting the AC Power Adapter Connecting the DC Power Cable Paper Installation Data Port Connection PIN Adapter Programming ∙ Programming outline 1. Select Channel Programming Keys Print Formatting Position Temperature Channels Voltage Channels Math PSEUDO-CHANNEL This Interval Overrun can be avoided in two ways LOG IntervalNot Printing Operation AT Full Cache Recording Time Temperature Units Rejection Frequency Calibration Mode To return to Normal mode Tadjust Voltage Input Scaling Matching Transducers to the OM-550Matching a Voltage Transducer R1 = 2 R2 = V-2 = 2.0000 VDC = R1 Matching a Current TransducerR1 = 2 Data Scaling mX + b calculation Matching and Scaling a Voltage Transducer VDC Matching and Scaling a Current Transducer Example U38u Unit Labels Operation Programmed Information Log Interval Time Temperature Units Enter a Tadjust value, or press OK to finish programming U44u Manual Reset programs the OM-550 as follows Appendix a Calibration ∙ Manual Reset∙ Performing a Manual Reset ∙ Calibration Procedure Setup ∙ Voltage Adjustment Procedure ∙ Thermocouple Adjustment Procedure ∙ Exiting CAL Mode To return to normal operation Voltage Measurement Inputs Appendix B SpecificationsAccuracy Printer Paper LifeDigital Interface RS-232 Conversion POWER/CURRENT Requirements Battery LifePhysical Dimensions Connectors OM-550 DOS Software Table of Contents How to Use This Manual Introduction Fonts Used in this Manual CPU, RAM, Hardware Printer Software Installation ∙ Hard Drive Installation Starting the Program To start the program Master Menu Reading Data from the OM-550 Load Existing LOG Files To load a LOG file Modify Software Configuration U6u List Data on Monitor To list data Print Data on Printer Save Text FileTo print data To save data as text Edit Plot Labels To edit a plot label HOT Plot Status BAR Magnify Tool To Magnify a portion of the Data Graph Magnify MAP Magnified Area Axis Labels Channel Data To select a channel to graph To link plot lines Channels 4 & 5 After Linking Data Graph ∙ X-Data Cursors ∙ Data Plots∙ X-Cursor Data Table Help Menu To activate the Help menu To list log files List Existing LOG Files on PrinterTo quit Appendix a KEY Functions