Manual (pdf) - Artisan Scientific

More documents

Recommendations

Info

Measuring Temperature Using Thermocouples(HP E1344A/47A Modules Only)• Closing the AT and AT2 Tree Switches allows a multimeter connectedto the AT Tree Switch Terminals to measure the voltage of athermocouple or resistance of a thermistor connected to any channel.• Closing the RT and AT2 Tree Switches allows a multimeter connectedto the AT Tree Switch Terminals to measure the resistance of thethermistor on the terminal module.• Use the thermistor resistance to calculate the temperature of theterminal module to compensate thermocouple temperaturemeasurements (see “Comments” later in this section).Example: Setup forMeasuringThermocoupleTemperature Using anExternal MultimeterFigure 3-6 and the following commands show how to set up channel 01 of asingle module switchbox to measure temperature of a thermocouple usingan external multimeter. Execute:CLOS (@192,193)measure thermistor temperatureOPEN (@193)CLOS (@101,190)192 and 193 close the AT2 andRT tree switches.Use multimeter.Opens the RT Tree Switch.Closes channel 01 and the ATtree switch.measure thermocouple voltage; calculatecompensated thermocouple voltageUse multimeter.Figure 3-6. Temperature Measurement on Channel 01 Using a ThermocoupleChapter 3Using the Relay Multiplexer Modules 39Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
CommentsTemperature Measurements using Thermistors. This consists of 2-wireor 4-wire Ohms measurements. See “Connecting Switchbox Channels toTree Terminals for Making Measurements” on page 34 for making thosemeasurements.Measuring Temperature with the HP E1326/E1411 Multimeters. TheHP E1326/E1411 Multimeters can directly measure channels of single ormultiple multiplexer modules. The multimeter automatically calculates thecorrect temperature for the specific thermistor or thermocouple type used.For more information, see the HP E1326/E1411 Multimeter User’s Manual.Thermocouple Compensation using the Thermistor on theHP E1344A/47A Terminal Module. The temperature inside the terminalmodule can affect the temperature reading taken from a thermocouple. Usethe thermistor inside the terminal module to determine the temperatureinside the terminal module to compensate the thermocouple temperaturemeasurements. Do the following:1. Measure the resistance of the thermistor on the terminal module.Compute the temperature of the terminal module from the reading(T ref ).2. For values of resistance between 92.7 to 3.685e6, use the followingequations to calculate the temperature of the terminal module:T ref = temperature in degrees C.Thermos = the resistance of channel x93, the 5K ohmthermistor.A = 1.28463e-3B = .23625e-3C = 9.2697e-8W = LOG (Thermos)T ref = 1./(A+W*(B +C*W*W))-273.153. Measure the voltage on the thermocouple connected to a channel (V t ).4. Convert the thermistor temperature (T ref ) to the thermocouple voltage(V ref ). Use the temperature to voltage characteristics of thethermocouple measured in step 2 (different thermocouples havedifferent temperature-to-voltage characteristics).5. Compute the compensated voltage (V) by the formula:V = (V t - V ref ).6. Convert the compensated voltage (V) calculated in step 4 totemperature. This is the actual temperature measured by thethermocouple.40 Using the Relay Multiplexer Modules Chapter 3Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Page 2: ContentsHP E1343A/44A/45A/47A Relay
Page 5 and 6: 4 ContentsArtisan Technology Group
Page 7 and 8: Documentation HistoryAll Editions a
Page 9 and 10: Notes:8Artisan Technology Group - Q
Page 11 and 12: Artisan Technology Group - Quality
Page 13 and 14: The AT Tree Switch Terminals also c
Page 15 and 16: Programming the Multiplexer ModuleT
Page 17 and 18: Multiplexer ChannelAddressFor the 1
Page 19 and 20: Notes:18 Getting Started Chapter 1A
Page 21 and 22: Connecting Field WiringFigure 2-1 s
Page 23 and 24: Connecting the Analog BusFigure 2-2
Page 25 and 26: Using the Multiplexer Module with a
Page 27 and 28: Selecting the Interrupt PriorityThe
Page 29 and 30: Figure 2-5. Signal Conditioning Com
Page 31 and 32: Notes:30 Configuring the Relay Mult
Page 33 and 34: Connecting Switchbox Channels to Co
Page 35 and 36: Connecting Switchbox Channels to Tr
Page 37 and 38: Scanning a Range of Switchbox Chann
Page 39: Example: Making 2-WireOhms Measurem
Page 43 and 44: Figure 4-1. Scanning Commands42 Und
Page 45 and 46: Example: Scanning WithExternal Devi
Page 47 and 48: Using the Scan Complete BitYou can
Page 49 and 50: CommandSeparatorA colon (:) always
Page 51 and 52: ABORtThe ABORt subsystem stops a sc
Page 53 and 54: :COUNt?ARM:COUNt? [MIN|MAX] returns
Page 55 and 56: :MONitor[:STATe]ParametersDISPlay:M
Page 57 and 58: :CONTinuous?INITiate:CONTinuous? qu
Page 59 and 60: [ROUTe:]The [ROUTe:] subsystem cont
Page 61 and 62: OPEN?[ROUTe:]OPEN? returns the cur
Page 63 and 64: ExampleSelecting the 4-Wire Ohms Mo
Page 65 and 66: :OPERation[:EVENt]?STATus:OPERation
Page 67 and 68: :CPONSYSTem:CPON opens all channel
Page 69 and 70: TRIGgerThe TRIGger subsystem comman
Page 71 and 72: Scanning Using Bus TriggersTRIG:SOU
Page 73 and 74: Command Quick ReferenceThe followin
Page 75 and 76: HP E1345A/47A 16-Channel Relay Mult
Page 77 and 78: Notes:76 16-Channel Relay Multiplex
Page 79 and 80: Figure B-2. Multiplexer Registers w
Page 81 and 82: Embedded ComputerProgramming(C-Size
Page 83 and 84: Writing to theRegistersYou can writ
Page 89 and 90: switches, 11Closingchannels, 16-17,
Page 91 and 92:
error numbers, 85initial operation,
Page 93 and 94:
Switchboxcard numbers, 14-15configu
Page 95 and 96:
Notes:94 IndexArtisan Technology Gr
show all

Manual (pdf) - Artisan Scientific

Create successful ePaper yourself

Delete template?

Save as template?