Fluke 53, 51, 54, 52 service manual Reference Junction Calibration

Page 19

Thermometer

Calibration and Offset Adjustment

11.To ignore the calibration changes, use K or N, and select “ CAL Abrt” and press

E.

12.Proceed to Reference Junction Calibration.

Reference Junction Calibration

Note

This procedure is described using an ice bath and a K-type thermocouple. It can be performed in °C, °F, or K with any thermocouple and a known, accurate temperature between 0 °C (+32 °F) and +50 °C (+122 °F).

Note

It is important that the temperature of the thermocouple and the internal temperature of the thermometer (the reference junction) have stabilized.

To calibrate the reference junction, follow these steps:

1.Prepare an ice bath (described earlier in this section).

2.Referring to Figure 2, connect the equipment to T1 using K-type thermocouple wire and a K-type thermocouple connector. Allow the setup to thermally stabilize at least 5 minutes after inserting the thermocouple connector into the thermometer.

3.Turn the thermometer on and select the thermocouple type using the D, K, N, and Ebuttons.

4.Enter calibration mode (refer to the “A/D Calibration” section, step 2).

5.Using K or N, select CAL rEF and press E.

6.Press K or N until the upper display matches the known temperature.

Note

Once adjusted, do not change units (°C, °F, or K) until the thermometer is in measurement mode.

7.Press the E button.

8.“ CAL donE”appears then press E to store the calibration in memory.

9.To ignore the calibration changes, use the K or N, and select “ CAL Abrt” and press E.

Using the Offset to Adjust for Variation Between Thermocouples

Use the offset option in the thermometer SETUP mode to adjust the thermometer's readings for errors of a specific thermocouple. Use the following procedure:

1.Plug the thermocouple into the thermometer input then allow the setup to thermally stabilize at least 5 minutes.

2.Place the thermocouple in a known, stable temperature environment (such as an ice bath, lag bath, or a dry well calibrator).

3.Allow the readings to stabilize.

4.In SETUP, change the offset until the primary display reading matches the bath temperature. (See "Changing Setup Options” in the 51/52 Series II Users Manual, and the 53/54 Series II Users Manual.)

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Contents 51, 52, 53, 54 Series Limited Warranty & Limitation of Liability Table of Contents 51, 52, 53, 54 Series List of Tables 51, 52, 53, 54 Series List of Figures 51, 52, 53, 54 Series Introduction 51, 52, 53, 54 SeriesInternational Electrical Symbols Used in this Manual Service CentersInternational Symbols Precautions and Safety InformationThermometer Safety Information WWarningElectrical SpecificationsGeneral Specifications EnvironmentalPerformance Tests Performance Test and Calibration Required Test EquipmentDisplay Test Keypad Test Wide Range Performance Test ProcedureIce Bath Test Verification of IR Communications Port Fluke 53 TemperatureCalibration Calibration and Offset AdjustmentMenu on the display changes to CAL A-d Reference Junction Calibration Cleaning the Thermometer Basic MaintenanceChanging the Batteries Disassembly Disassembly and ReassemblyReinstalling the LCD Assembly ReassemblyNumber Replaceable Parts Fluke Part Qty Description Model Replaceable PartsModel Number NumberQty Fluke Part Number Replaceable Parts DescriptionExploded View Model 54 is Shown 51, 52, 53, 54 Series Index 51, 52, 53, 54 Series
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51, 52, 53, 54 specifications

The Fluke 51 is a high-precision digital thermometer designed for industrial and laboratory applications, offering accurate temperature measurements across a wide range of environments. With its robust build and advanced features, the Fluke 51 is a tool of choice for field technicians and engineers.

The Fluke 51 boasts an impressive temperature measurement range, typically from -200°C to 1372°C (-328°F to 2500°F), making it suitable for various applications, including HVAC, food processing, and scientific experimentation. One of its standout characteristics is its thermocouple compatibility, supporting multiple thermocouple types such as J, K, T, E, N, R, S, and B. This versatility allows users to select the appropriate sensor for their specific temperature requirements, enhancing measurement accuracy.

A key feature of the Fluke 51 is its fast response time, allowing users to obtain readings within seconds, which is essential for time-sensitive applications. The device is equipped with a large, easy-to-read LCD display that shows clear numerical values, ensuring users can read measurements from a distance or in difficult lighting conditions. Additionally, the display includes a hold function, enabling users to freeze the reading for easier observation.

In terms of data management, the Fluke 51 provides the option to store and recall temperature readings, facilitating efficient documentation and analysis. Its rugged design, resistant to dust and moisture, makes it suitable for use in demanding environments, ensuring durability and longevity.

The Fluke 51 is powered by standard AA batteries, giving it an extended operational lifespan. It also features a low battery indicator, helping users to manage power effectively and avoid unexpected downtime. The device is compact and lightweight, fitting comfortably in the hand and allowing for easy transport.

Another important aspect is its user-friendly interface, which includes intuitive buttons for quick navigation through settings and options. This design consideration enhances usability, allowing even novice users to operate the thermometer efficiently.

In summary, the Fluke 51 digital thermometer combines precision, durability, and ease of use, making it an essential tool in various professional settings. With its wide temperature range, thermocouple compatibility, fast response time, and robust design, the Fluke 51 is positioned as a reliable instrument for accurate temperature measurements wherever the task may take you.
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