Lake Shore 234 User Manual
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Contents
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Lake Shore Model 234/234D User’s ManualService 5-55.4 CALIBRATIONThe section covers Required Test Equipment in Paragraph 5.4.1, ReferenceCalibration procedure is provided in Paragraph 5.4.2. Finally, the calibrationprocedure is provided in Paragraph 5.4.3. See Figure 5-3 for the Model 234PCB layout. Allow 5 minutes warm-up before performing any calibrationprocedures. The following resistance ranges are implemented on the Model234 Temperature Transmitter:Approximate Internal InternalSensor Reference Sensor A/D VoltageScale Resistance Resistance Voltage Reading0 1 – 6 Ω 10 Ω 5 mV 0.15 to 1.0 V1 4.5 – 12.5 Ω 100 Ω 5 mV 0.8 to 2.2 V2 9 – 60 Ω 100 Ω 10 mV 0.35 to 2.2 V3 45 – 125 Ω 1 kΩ 5 mV 0.8 to 2.2 V4 90 – 360 Ω 1 kΩ 10 mV 0.55 to 2.2 V5 290 – 1.25 kΩ 3.16 kΩ 10 mV 0.55 to 2.2 V6 900 – 3.6 kΩ 10 kΩ 10 mV 0.55 to 2.2 V7 2.9 k – 12.5 kΩ 31.6 kΩ 10 mV 0.55 to 2.2 V8 9 k – 36 kΩ 100 kΩ 10 mV 0.55 to 2.2 V9 29 k – 300 kΩ 316 kΩ 10 mV 0.21 to 2.2 VScale changing depends on the forward A/D voltage reading. The lower andupper range in resistance is approximately subject to variations in gains andoffsets.Note the sensor voltage continually switches between positive and negativevalues to obtain the forward and reverse readings. Thus, the sensor and A/Dvoltage cannot be read reliably with a DC voltmeter.Calibration results in a forward A/D reading of approximately 0.65 or 2 voltsat the time of calibration (See table below). This allows for over-rangingdependent on variation in gains and offsets. The reference resistance andapproximate A/D voltages used for each value of calibration resistance isshown below.InternalCalibration Reference ApproximateResistance Resistance A/D Voltage1 Ω 10 Ω 1.0 V10 Ω 100 Ω 2.0 V100 Ω 1 kΩ 2.0 V1 kΩ 3.16 kΩ 0.65 V1 kΩ 10 kΩ 2.0 V10 kΩ 31.6 kΩ 0.65 V10 kΩ 100 kΩ 2.0 V100 kΩ 316 kΩ 0.65 V |
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