Omega 27, 25, 26, 24 manual Hold, Meter Mode Operation RTD, Thermistor & Ohms Set-Up

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6.Select display resolution with 0.1°/1° key. NOTE: Set-up is retained during power-off.

Hold:

Meter readings can be put on hold at any time by depressing the HOLD key. At this time, the HOLD annunciator turns on, the reading is frozen, and all keys (except ON/OFF and HOLD) are locked out. Depress the HOLD key again to return to real-time readings, and re-enable the keypad.

4.METER MODE OPERATION (RTD, Thermistor & Ohms) Set-Up:

1.Connect a sensor or unknown resistance to the instrument as shown in Figures 4, 5, or 6.

The 2-wire configuration is simplest, but includes lead-wire resistance in the measurement. 2-wire measurements are generally limited to high resistance sensors (e.g. 1000-ohm RTDs, 2252-ohm thermistors).

Figure 4. 2-Wire Resistance Measurement

Figure 5. 3-Wire Resistance Measurement

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Contents CL23A, 24, 25, 26 Omega.comTM Table of Contents Common Specifications General InformationTemperature Coefficient Page Unique Specifications Model CL23A/CL23ECModel CL24 Model CL25/CL25ECManual Addenda FeaturesModel CL27/CL27EC Safety Precautions Safety InformationUnpacking Your Unit Page Battery INSTALLATION/REPLACEMENT Battery InstallationMemory Backup Operation with Rechargeable BatteryDiagnostics and Error Messages Problem Likely CauseOperating Instructions Initial Turn onKeypad Meter Mode Operation Thermocouples Set-Up OPRMeter Mode Operation RTD, Thermistor & Ohms Set-Up HoldData Logging and Recall To Save Readings To Recall ReadingsTo Erase Data Locations Meter Mode Calibrator Mode Operation Thermocouples Set-UpCalibrator Mode Operation RTD, Thermistor & Ohms Set-Up CHANGE/ENTER, 2, 1, 2, 0, CHANGE/ENTERWire Resistance Simulation Storage and Recall of Calibrator Settings To Store OutputsTo Erase Set-Up Locations Calibrator Mode To Recall OutputsStep Function Ramp Function CL25 and CL27Service Information Calibration ProceduresThermocouple Calibration Test Equipment Required Ambient ConditionsPage Calibration Adjustments Meter-Mode Zero & Gain Adjustments Sensor Step Input Adjust ReadingCalibrator-Mode Zero & Gain Adjustments Sensor Output Adjust ReadingCalibration Setup, Copper Mode Resistance Calibration Test Equipment RequiredResistance Calibration Setup Calibration Adjustments Output Input Adjust Verify Reading Input Adjust Verify ReadingCalibration of Meter-Mode Resistance Functions RTD-Thermistor Sensor Unit StepCalibration Verification Model Software Revision Equipment RequiredPage Page Alloy Mode Verification Procedure for Thermocouple Functions Page Mechanical Parts Diagram Calibration Procedures Page Page Page Page Page USAWARRANTY/DISCLAIMER Temperature