Lake Shore 234 User Manual
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Contents
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Lake Shore Model 234/234D User’s ManualInstallation 2-52.4.1 CalCurve™CalCurve (formerly called Precision Option) is the easiest way to combinethe performance of a Lake Shore calibrated sensor with the Model 234. IfCalCurve is present, Place the T/R switch in the T position. See Paragraph3.1 for output current temperature ranges.The factory stores the optional Model 8001-234 CalCurve in the unit if it isordered with the unit. The Curve EPROM (see Figure 5-4) is labeled with thesensor serial number. See Chapter 5 for Curve EPROM field installation.The optional Model 8001-234 CalCurve data is stored in a temperatureversus log of resistance breakpoint table. The log of resistance is uniformlyspaced over three regions: log(R) of 0 to 2.98 is spaced every 0.02; log(R) of3.0 to 3.96 is spaced every 0.04; and log(R) of 4.0 to 5.6 is spaced every0.1. Six temperature digits are stored to the 1 mK place. A summary of curvebreakpoints, sensor resistance, log of resistance, and maximum temperatureerror comes with each CalCurve. See Chapter 4 for Curve programming orverifying curve data via the serial interface.2.5 POWER CONNECTIONSA +5 VDC supply in the VME rack or an external power supply powers theModel 234. Regulate the voltage to within ±0.25 VDC. Each Model 234draws up to 500 mA from the supply (750 mA for the Model 234D). Theexternal power supply connector must be S-760 or S-765 Switchcraft (orequivalent) plug (0.218 inch O.D., accepts 0.08 inch diameter pin) with+5 VDC on the sleeve and return on the center pin.A wall plug-in power supply Model 2007-XX +5 VDC Regulated PowerSupply can be used with the Model 234. Power Supply input is based onlocal power requirements as follows:MODEL INPUT POWER2007-122007-22120 V 60 Hz. power source230 V 50 Hz. power sourceCAUTION: Never ground both the sensor and the 4–20 mA output.Ground either the sensor, or the output, but not both.The Model 2308-10 VMEbus rackmount case has a built-in power supply foruse with up to twelve Model 234s. The built-in power supply has a universalinput: 85 to 265 VAC, 47 to 440 Hz, 60 watts. |
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