Lake Shore 370 User Manual
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Contents
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Lake Shore Model 370 AC Resistance Bridge User’s Manual5.1.3 CalCurve™The CalCurve service provides the user with a convenient way get the temperature response curve from Lake Shorecalibrated sensors into instruments like the Model 370. It can be performed at the factory when calibrated sensors andinstruments are ordered together. The factory installed CalCurve option is Model 8001-370 and should be ordered with acalibrated sensor. A CalCurve can be done in the field when additional or replacement sensors are installed. Curve datais loaded into some type of non-volatile memory that is installed into the instrument by the user. In the case of the Model370, the curve is loaded into a non-volatile memory, which can be installed into the instrument. The field installedversion is a Model 8002-05-370 and should be ordered with a calibrated sensor. Customers that have a PC-compatiblecomputer with an RS-232C or IEEE-488 interface have another option. The Model 8000 is included with the calibratedsensor and can be loaded by the user. Lake Shore offers a free curve loading program that is compatible with Model8000 CalCurves.5.2 FRONT PANEL CURVE ENTRY OPERATIONSThere are three operations associated with front panel curve entry: Edit curve, Copy curve and Erase curve as detailedbelow. Similar operations are available over computer interface.Edit Curve Edit allows the user to enter or edit a curve at any user curve location. Refer to Paragraph 5.2.1Erase Curve Erase allows the user to delete a curve from any user curve location. Refer to Paragraph 5.2.2Copy Curve Copy allows the user to copy a curve from any location to any othercurve location. Refer to Paragraph 5.2.35.2.1 Edit CurveThe Edit Curve operation is used to enter a new curve or edit an existing user curve. Any user curves (1 to 20) can bechanged. Entering the identification parameters associated with the curve is as important as entering the breakpoints.Curve header parameters are listed in Table 5-1. Typical parameters for common sensors are listed in Table 5-2. Readthis section completely and gather all necessary data before beginning the process.NOTE: If the curve you wish to enter has similar parameters to an existing curve, first copy the similar curve(as described in Paragraph 5.2.3) to a new location, then edit the curve to the desired parameters.Table 5-1. Curve Header ParametersNameThe curve name cannot be changed from the front panel. Curve names can only be entered over thecomputer interface (up to 15 characters). The default curve name is User Curve xx, where xx is thecurve number.SerialNumberSpecific sensors serial numbers (up to 10 characters). The serial number field accepts both numbers andletters over computer interface, but the instrument front panel enters only numbers. The default is blank.CurveFormatThe instrument must know the data format of the curve breakpoints. Different sensor types use differentdata formats. The sensor inputs require one of the formats below. The range and resolution specified arenot always available at the same time. Practical range and resolution depend on the sensor type.Sensor Units Sensor UnitsFormat Description Full Scale Range Maximum ResolutionΩ/K Resistance vs. Kelvin 10 k (Ω) 0.001 (Ω)log R/K log Resistance vs. Kelvin 7 (log R) 0.00001 (log R)SetpointLimitA setpoint temperature limit can be included with every curve. When controlling in temperature, thesetpoint cannot exceed the limit entered with the curve for the control sensor. The default is 375 K. Setto 9999 K if no limit is required.TemperatureCoefficientThe instrument derives the temperature coefficient from the first two breakpoints. If set improperly,check the first 2 breakpoints. A positive coefficient indicates the sensor signal increases with increasingtemperature. A negative coefficient indicates the sensor signal decreases with increasing temperature.5-2 Advanced Operation |
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