The Fluke Calibration 1529 is a high-precision, four-channel reference thermometer designed for professional temperature measurement, laboratory calibration and industrial temperature metrology. Also known as the Fluke Calibration 1529 Chub-E4, this versatile instrument combines excellent measurement accuracy, flexible sensor compatibility and integrated data logging capabilities in one compact thermometer readout.
The Fluke Calibration 1529 supports platinum resistance thermometers (PRTs), resistance temperature detectors (RTDs), precision thermistors and thermocouples. Depending on the selected configuration, the instrument provides four measurement channels for resistance-based temperature sensors, four thermocouple channels or a combination of both technologies.
With a readout accuracy of up to ±0.0025 °C when measuring precision thermistors, the Fluke Calibration 1529 offers excellent performance for demanding temperature measurement applications.
The instrument supports PRT measurements from −189 °C to +960 °C, thermistor measurements from −50 °C to +150 °C and thermocouple measurements from −270 °C to +1800 °C.
One of the most important advantages of the Fluke Calibration 1529 is its ability to measure up to four temperature sensors simultaneously.
This makes the instrument particularly suitable for temperature comparison calibration, reference measurements, temperature stability monitoring and laboratory applications requiring multiple measurement channels.
The integrated data logger stores up to 8,000 measurements with date and time stamps. An illuminated graphical display allows users to monitor several temperature readings and measurement parameters.
With RS-232 communication, optional IEEE-488 connectivity and compatibility with Fluke LogWare II and MET/TEMP II software, the Fluke Calibration 1529 can also be integrated into automated temperature calibration systems.
At europascal, the Fluke Calibration 1529 provides a professional solution for high-accuracy temperature measurements and reference thermometer applications.
europascal supports customers with temperature calibration equipment, reference thermometers and professional calibration services.
For reliable measurement results and metrological traceability, visit the europascal Calibration Service.
Your Benefits at a Glance
- High-precision four-channel reference thermometer
- Measurement of up to four temperature sensors
- Readout accuracy down to ±0.0025 °C with thermistors
- PRT readout accuracy of ±0.006 °C at 0 °C
- Compatible with platinum resistance thermometers
- Compatible with industrial RTDs
- Compatible with precision thermistors
- Compatible with thermocouples
- Three available input configurations
- PRT temperature range from −189 °C to +960 °C
- Thermistor temperature range from −50 °C to +150 °C
- Thermocouple temperature range from −270 °C to +1800 °C
- Integrated data logger
- Storage of up to 8,000 measurements
- Date and time stamps
- Storage of 100 individual measurements
- Fourteen selectable logging intervals
- Fast measurement mode with up to ten readings per second
- Illuminated graphical LCD
- Display of eight user-selected measurement fields
- Configurable measurement averaging
- ITS-90 temperature conversion
- Callendar-Van Dusen temperature conversion
- Steinhart-Hart thermistor conversion
- Internal and external thermocouple reference junction compensation
- RS-232 communication interface
- Optional IEEE-488 interface
- Compatible with Fluke LogWare II
- Compatible with MET/TEMP II
- Rechargeable NiMH battery
- Typical battery operation of eight hours
- Suitable for laboratory and field calibration
- Professional calibration support from europascal
Four Independent Temperature Measurement Channels
The Fluke Calibration 1529 features four measurement channels.
Depending on the selected model, the channels can be configured for different temperature sensor technologies.
Three configurations are available.
Fluke Calibration 1529
The standard configuration provides:
Two PRT/thermistor channels and two thermocouple channels.
This configuration is particularly useful when resistance thermometers and thermocouples must be measured within the same calibration system.
Fluke Calibration 1529-R
The 1529-R provides:
Four PRT/thermistor channels.
This configuration is ideal for temperature calibration laboratories using precision resistance thermometers and thermistors.
Fluke Calibration 1529-T
The 1529-T provides:
Four thermocouple channels.
This configuration is particularly suitable for industrial thermocouple measurements and high-temperature calibration applications.
The input configuration must be selected when ordering the instrument.
High-Precision Temperature Measurement
The Fluke Calibration 1529 is designed for demanding temperature measurement applications.
Its precision measurement circuitry provides excellent accuracy for resistance thermometers, thermistors and thermocouples.
The manufacturer specifies the following readout accuracies for selected measurement conditions:
PRT at 0 °C: ±0.006 °C
Thermistor at 25 °C: ±0.0025 °C
Type J thermocouple at 600 °C: ±0.35 °C with internal reference junction compensation
These values refer to the thermometer readout and do not include the measurement uncertainty of the connected temperature sensor.
The total uncertainty of a complete temperature measurement system also depends on the sensor calibration, stability, self-heating and measurement conditions.
This distinction is particularly important for accredited temperature calibration laboratories.
Platinum Resistance Thermometer Measurement
The Fluke Calibration 1529 supports precision platinum resistance thermometers.
PRTs are widely used in temperature metrology because of their excellent stability and reproducibility.
The instrument supports temperature measurements from:
−189 °C to +960 °C
The resistance measurement range is:
0 Ω to 400 Ω
The Fluke Calibration 1529 supports several temperature conversion methods, including:
- ITS-90
- IEC 751
- Callendar-Van Dusen
These methods allow the measured resistance to be converted into temperature according to the selected sensor characteristic.
The ITS-90 conversion is particularly useful for calibrated reference thermometers.
PRT Measurement Accuracy
The Fluke Calibration 1529 provides excellent readout accuracy for platinum resistance thermometers.
Typical manufacturer specifications include:
| Temperature | PRT Readout Accuracy |
|---|---|
| −100 °C | ±0.004 °C |
| 0 °C | ±0.006 °C |
| 100 °C | ±0.009 °C |
| 200 °C | ±0.012 °C |
| 400 °C | ±0.018 °C |
| 600 °C | ±0.024 °C |
These specifications refer to the thermometer readout under the manufacturer’s defined conditions.
The actual measurement uncertainty depends on the connected PRT and its calibration.
Precision Thermistor Measurement
The Fluke Calibration 1529 also supports precision thermistors.
Thermistors are temperature-dependent resistors that provide excellent sensitivity over relatively limited temperature ranges.
The supported temperature range is:
−50 °C to +150 °C
The resistance measurement range extends to:
500 kΩ
The manufacturer specifies a readout accuracy of:
±0.0025 °C at 25 °C
The instrument supports Steinhart-Hart temperature conversion and the YSI-400 characteristic.
This allows different precision thermistor types to be used.
Thermistor Measurement Accuracy
The Fluke Calibration 1529 provides excellent accuracy when measuring precision thermistors.
Typical manufacturer specifications include:
| Temperature | Thermistor Readout Accuracy |
|---|---|
| 0 °C | ±0.0025 °C |
| 25 °C | ±0.0025 °C |
| 50 °C | ±0.004 °C |
| 75 °C | ±0.010 °C |
| 100 °C | ±0.025 °C |
These values demonstrate the excellent measurement performance available with precision thermistors.
Thermistors are particularly suitable for accurate reference temperature measurements near room temperature.
Steinhart-Hart Temperature Conversion
The Fluke Calibration 1529 supports the Steinhart-Hart equation.
This equation describes the nonlinear relationship between thermistor resistance and temperature.
A common form is:
1/T = A + B × ln(R) + C × [ln(R)]³
Where:
- T = Absolute temperature in kelvin
- R = Thermistor resistance
- A, B and C = Sensor-specific coefficients
The coefficients are determined during sensor calibration.
By entering the appropriate coefficients, the Fluke Calibration 1529 can calculate temperature according to the characteristics of the connected thermistor.
This improves measurement accuracy compared with using a generic sensor characteristic.
Thermocouple Temperature Measurement
The Fluke Calibration 1529 supports several thermocouple types.
Standard supported types include:
- Type B
- Type E
- Type J
- Type K
- Type N
- Type R
- Type S
- Type T
- Au-Pt thermocouples
Additional thermocouple characteristics, including types C and U, can be supported using appropriate configurations.
The thermocouple measurement range extends from:
−270 °C to +1800 °C
The actual temperature range depends on the selected thermocouple type.
The instrument measures the thermoelectric voltage and converts it into temperature according to the selected characteristic.
Internal and External Reference Junction Compensation
Accurate thermocouple measurements require consideration of the reference junction temperature.
The Fluke Calibration 1529 supports:
Internal reference junction compensation
and
External reference junction compensation
Internal compensation uses the instrument’s reference junction temperature measurement.
External compensation allows a separately established reference junction temperature to be used.
This provides additional flexibility for laboratory thermocouple measurements.
The manufacturer specifies an internal reference junction contribution of approximately:
±0.25 °C
The choice of reference junction compensation method influences the achievable measurement accuracy.
High-Accuracy Resistance Measurement
The Fluke Calibration 1529 provides precision resistance measurement for PRTs, RTDs and thermistors.
For PRT measurements, the manufacturer specifies:
0 Ω to 20 Ω: ±0.0005 Ω
20 Ω to 400 Ω: ±25 ppm of reading
For thermistors, the specified resistance measurement ranges include:
| Resistance Range | Accuracy |
|---|---|
| 0 Ω to 5 kΩ | ±0.5 Ω |
| 5 kΩ to 200 kΩ | ±100 ppm of reading |
| 200 kΩ to 500 kΩ | ±300 ppm of reading |
These specifications describe the measurement accuracy of the instrument.
The corresponding temperature accuracy depends on the resistance-temperature characteristic of the connected sensor.
Four-Wire Resistance Measurement
The Fluke Calibration 1529 supports two-, three- and four-wire connections for resistance-based temperature sensors.
Four-wire measurement is particularly useful for precision temperature metrology.
In a four-wire configuration, the current-carrying and voltage-sensing connections are separated.
This minimizes the influence of connecting lead resistance.
Four-wire measurement is therefore preferred for high-accuracy reference temperature measurements.
The Fluke Calibration 1529 uses a reversing excitation current of:
1 mA for PRT measurements
This helps reduce the influence of thermoelectric offset voltages.
Integrated Data Logger
The Fluke Calibration 1529 includes an integrated data logger.
The instrument can store up to:
8,000 measurements
Recorded measurements include date and time information.
This makes the instrument suitable for temperature stability monitoring and laboratory measurement documentation.
The instrument also supports storage of:
100 individual measurements
Measurement data can be organized into logging sessions.
Each session can be assigned an identifying label.
This simplifies the organization and evaluation of recorded temperature measurements.
Fourteen Selectable Logging Intervals
The Fluke Calibration 1529 supports fourteen selectable logging intervals.
Available intervals include:
- 0.1 seconds
- 0.2 seconds
- 0.5 seconds
- 1 second
- 2 seconds
- 5 seconds
- 10 seconds
- 30 seconds
- 60 seconds
- 2 minutes
- 5 minutes
- 10 minutes
- 30 minutes
- 60 minutes
This flexibility allows the instrument to be adapted to different measurement applications.
Short intervals are suitable for monitoring rapid temperature changes.
Longer intervals are useful for extended temperature stability measurements.
Fast Measurement Mode
The Fluke Calibration 1529 provides a fast measurement mode.
The manufacturer specifies measurement rates of up to:
10 readings per second
This mode is available for measurements on one channel.
For simultaneous measurements of multiple channels, measurement intervals of one second or longer are supported.
Fast measurement mode is particularly useful when observing relatively rapid temperature changes.
For high-accuracy measurements, the influence of operating conditions and measurement speed must be considered.
Simultaneous Temperature Comparison
The four-channel design makes the Fluke Calibration 1529 particularly useful for temperature comparison measurements.
For example, one channel can be connected to a calibrated reference thermometer.
The remaining channels can be connected to temperature sensors under test.
All sensors can be placed in the same temperature source.
The difference between the indication of a device under test and the reference temperature can be calculated as:
ΔT = T_DUT − T_REF
Where:
- ΔT = Temperature indication difference
- T_DUT = Temperature indicated by the device under test
- T_REF = Reference temperature
This method is commonly used for temperature comparison calibration.
The overall measurement uncertainty must consider the reference thermometer, temperature source, immersion conditions and other relevant contributions.
Temperature Calibration Baths
The Fluke Calibration 1529 is particularly suitable for use with liquid calibration baths.
A calibrated reference thermometer can be connected to one channel.
Additional temperature sensors can be connected to the remaining channels.
All sensors are immersed in the calibration bath.
The thermometer readout measures the temperatures simultaneously.
This allows several temperature sensors to be compared with the reference thermometer.
The integrated data logger can also record temperature changes during the calibration procedure.
Dry-Block Temperature Calibration
The Fluke Calibration 1529 can also be used with dry-block temperature calibrators.
A calibrated reference temperature probe is inserted into a suitable calibration insert.
Additional temperature sensors can be measured using the remaining channels.
This allows several sensors to be evaluated during the same calibration procedure.
The Fluke Calibration 1529 measures temperature but does not generate a physical temperature.
Graphical Display
The Fluke Calibration 1529 features an illuminated graphical LCD.
The manufacturer specifies a display size of:
33 × 127 mm
The display allows users to view temperature measurements and additional measurement parameters.
Up to eight user-selected data fields can be displayed.
This provides a convenient overview of multiple measurement channels.
Supported display units include:
- °C
- °F
- K
- Ω
- kΩ
- mV
Measurement Averaging
The Fluke Calibration 1529 provides configurable measurement averaging.
The instrument can calculate a moving average of the most recent:
2 to 10 readings
The number of readings can be selected by the user.
Measurement averaging can reduce the influence of random fluctuations in the displayed measurement values.
This is particularly useful when monitoring stable temperature conditions.
RS-232 Communication
The Fluke Calibration 1529 includes an RS-232 communication interface.
The interface allows the instrument to communicate with a computer or automated calibration system.
Measurement data can be transferred for analysis and documentation.
Remote control functions allow the thermometer readout to be integrated into computer-controlled measurement applications.
Optional IEEE-488 Interface
An optional IEEE-488 interface is available for the Fluke Calibration 1529.
IEEE-488, also known as GPIB, is widely used in automated laboratory measurement systems.
The interface allows the thermometer readout to be integrated into computer-controlled calibration systems.
This is particularly useful when several measurement instruments must be controlled through a central computer.
Fluke LogWare II Software
The Fluke Calibration 1529 is compatible with Fluke LogWare II software.
LogWare II supports computer-based temperature monitoring and data acquisition.
The software can record measurements from all four channels.
Typical functions include:
- Temperature data acquisition
- Measurement logging
- Graphical temperature trends
- Statistical evaluation
- Alarm functions
- Automated measurement recording
- Measurement documentation
When measurements are recorded directly to a computer, the amount of stored data is not restricted to the instrument’s internal memory capacity.
MET/TEMP II Calibration Software
The Fluke Calibration 1529 is also compatible with MET/TEMP II temperature calibration software.
MET/TEMP II supports automated temperature calibration procedures.
The software allows compatible reference thermometers and temperature sources to be integrated into a calibration system.
With the Fluke Calibration 1529, one channel can be used for a reference thermometer while up to three additional channels measure sensors under test.
This provides an efficient solution for automated temperature comparison calibration.
Rechargeable Battery Operation
The Fluke Calibration 1529 includes a rechargeable NiMH battery.
The manufacturer specifies a typical battery operating time of:
8 hours
This value applies to operation without the display backlight.
The battery can be recharged using the external power supply.
The typical charging time is approximately:
3 hours
Battery operation makes the instrument suitable for mobile calibration applications.
Compact Laboratory Design
The Fluke Calibration 1529 combines laboratory measurement performance with a relatively compact design.
The manufacturer specifies the following dimensions:
102 × 191 × 208 mm
The weight is approximately:
2 kg
The instrument can be used on laboratory benches or transported to different measurement locations.
An optional carrying case is available for additional protection during transport.
Technical Highlights
| Feature | Fluke Calibration 1529 |
|---|---|
| Product type | Four-Channel Reference Thermometer |
| Manufacturer | Fluke Calibration |
| Product series | Chub-E4 |
| Measurement channels | 4 |
| Supported sensors | PRT, RTD, Thermistor, Thermocouple |
| Input configurations | 2 PRT/thermistor + 2 TC; 4 PRT/thermistor; 4 TC |
| PRT temperature range | −189 °C to +960 °C |
| Thermistor temperature range | −50 °C to +150 °C |
| Thermocouple temperature range | −270 °C to +1800 °C |
| PRT accuracy at 0 °C | ±0.006 °C |
| Thermistor accuracy at 25 °C | ±0.0025 °C |
| PRT resolution | 0.001 °C |
| Thermistor resolution | 0.0001 °C |
| Thermocouple resolution | 0.001–0.01 °C |
| PRT resistance range | 0–400 Ω |
| Thermistor resistance range | 0–500 kΩ |
| Thermocouple voltage range | −10 to +100 mV |
| PRT excitation current | 1 mA, reversing |
| Thermistor excitation current | 2 µA or 10 µA |
| Resistance connections | 2-, 3- and 4-wire |
| Data logging memory | 8,000 measurements |
| Individual measurement memory | 100 readings |
| Logging intervals | 0.1 seconds to 60 minutes |
| Fast measurement rate | Up to 10 readings per second on one channel |
| Display | Backlit graphical LCD |
| Display dimensions | 33 × 127 mm |
| Communication | RS-232 |
| Optional communication | IEEE-488 |
| Compatible software | Fluke LogWare II, MET/TEMP II |
| Operating ambient temperature | 16–30 °C |
| Battery | Rechargeable NiMH |
| Typical battery operation | 8 hours without backlight |
| Charging time | Approximately 3 hours |
| AC power supply | 100–240 V AC, 50–60 Hz |
| Dimensions | 102 × 191 × 208 mm |
| Weight | Approximately 2 kg |
Available Models
Fluke Calibration 1529
Four-channel reference thermometer with two PRT/thermistor inputs and two thermocouple inputs.
Fluke Calibration 1529-R
Four-channel reference thermometer with four PRT/thermistor inputs.
Fluke Calibration 1529-T
Four-channel reference thermometer with four thermocouple inputs.
The required configuration must be selected when ordering.
Fluke Calibration 1524 vs. Fluke Calibration 1529
The Fluke Calibration 1524 and 1529 are both precision thermometer readouts.
However, they are designed for different applications.
| Feature | Fluke Calibration 1524 | Fluke Calibration 1529 |
|---|---|---|
| Measurement channels | 2 | 4 |
| Sensor compatibility | PRT, RTD, Thermistor, TC | Depends on input configuration |
| Best thermistor readout accuracy | ±0.002 °C | ±0.0025 °C |
| Data logging memory | 15,000 measurements | 8,000 measurements |
| Portable operation | Yes | Yes |
| Graphical display | Yes | Yes |
| RS-232 interface | Yes | Yes |
| IEEE-488 option | No | Yes |
| MET/TEMP II integration | Application-dependent | Yes |
| Typical application | Portable reference measurements | Multi-channel laboratory calibration |
The Fluke Calibration 1524 is particularly suitable for portable temperature measurements with two sensors.
The Fluke Calibration 1529 is ideal for laboratory applications requiring four measurement channels and flexible sensor configurations.
Typical Applications
The Fluke Calibration 1529 is suitable for:
- Reference temperature measurements
- Temperature calibration laboratories
- Multi-channel temperature measurement
- PRT temperature measurement
- Pt100 temperature measurement
- RTD temperature measurement
- Precision thermistor measurement
- Thermocouple measurement
- Temperature comparison calibration
- Temperature calibration bath monitoring
- Dry-block temperature calibration
- Temperature stability measurements
- Temperature data logging
- Automated temperature calibration
- Temperature trend monitoring
- Industrial temperature measurement
- Quality assurance
- Research laboratories
- Pharmaceutical laboratories
- Production testing
- Temperature metrology
Calibration by europascal
Regular calibration is essential for maintaining reliable temperature measurement results.
europascal provides professional calibration services for temperature measuring instruments and reference temperature measurement systems.
The Fluke Calibration 1529 can be calibrated to verify its resistance and voltage measurement functions.
When combined with calibrated temperature probes, the instrument can be used as part of a traceable reference temperature measurement system.
The four measurement channels allow several temperature sensors to be measured during the same calibration procedure.
For professional calibration and metrological traceability, visit the europascal Calibration Service.
europascal also supports customers with the selection of suitable reference temperature probes and temperature calibration equipment.
Why Choose the Fluke Calibration 1529?
The Fluke Calibration 1529 combines high measurement accuracy, flexible sensor compatibility and advanced data logging capabilities in a compact four-channel reference thermometer.
Its four measurement channels allow several temperature sensors to be measured simultaneously.
Three available input configurations provide flexibility for PRTs, thermistors and thermocouples.
Readout accuracy down to ±0.0025 °C with precision thermistors makes the instrument suitable for demanding temperature measurement applications.
The integrated data logger stores up to 8,000 measurements with date and time stamps.
The graphical display allows users to monitor several measurement channels and additional measurement parameters.
RS-232 communication and optional IEEE-488 connectivity support integration into automated laboratory systems.
Compatibility with Fluke LogWare II and MET/TEMP II software further extends the instrument’s functionality.
Rechargeable battery operation and compact dimensions make the instrument suitable for laboratory and mobile applications.
For professional users requiring a versatile four-channel reference thermometer, the Fluke Calibration 1529 provides an excellent combination of accuracy, flexibility and measurement efficiency.
europascal supports customers with temperature calibration equipment, reference thermometers and professional calibration services.
