New Fluke 1594A/1595A Super-Thermometers deliver primary-lab precision and productivity

Ratio self-calibration ensures accuracy

Sydney, July 12, 2010  – Fluke Corporation, a global leader in electronic test and measurement technology, has introduced the new 1594A/1595A Super-Thermometers from Hart Scientific, designed to combine accuracy, value and innovative features for calibration of SPRTs, PRTs and thermistors.

The Fluke 1594A and 1595A Super-Thermometers are accurate enough for the primary lab, providing accuracy as good as 0.06 ppm (0.000015 °C), and economical enough for the secondary lab. Metrologists can feel confident that every measurement made with the Super-Thermometer falls within expected limits, easily verified at any time.

Other features include:

Ratio self-calibration for confidence in every measurement

The 1594A and 1595A feature patent-pending “ratio self-calibration” that enables users to test the accuracy or calibrate the resistance ratio linearity of the Super-Thermometer’s measurement circuit – regularly, easily, and without requiring any external devices or special training.

Metrologists can verify accuracy and performance automatically in about 30 minutes, at the touch of a button. Although unlikely, measurement circuit defects would be detected and reported automatically. No other temperature measurement instrument on the market more fully empowers the metrologist to determine and improve instrument performance.

Calibrate internal reference resistors, quickly and easily

Users can also calibrate the Super-Thermometer’s internal reference resistors using the resistance calibration function and an external standard resistor. The Super-Thermometer assists with the calibration through an easy-to-use setup utility. Once the calibration is complete, the Super-Thermometer reports the results to the display and provides the option to write the results to a USB memory device. You can also choose whether or not to adjust the calibration parameters of the internal reference resistor by pressing the password-protected adjust resistor function key.

Low measurement noise

Measurement noise is caused by electrical noise and other random errors that can negatively influence measurement accuracy. New patent-pending design innovations incorporated into the Super-Thermometer reduce measurement noise and interference to levels that are unprecedented for a digital thermometry bridge. In a typical temperature calibration application, uncertainty due to measurement noise is as low as 0.00002 °C.

Fast measurement speed

Super-Thermometers offer speeds as fast as one second per measurement (full accuracy with a two second sample rate). This means users can complete tests in less time, track temperature changes more accurately, and even evaluate thermal response in sensors. When measuring fixed-point temperatures that require the highest levels of accuracy and lowest levels of noise, users have complete control to change the measurement speed to meet their requirements.

Product availability

The Fluke 1594A and 1595A Super-Thermometers are now available. For more information on Fluke tools and applications, or to find the location of your nearest distributor, contact Dennis Juniper at Fluke Australia, Locked Box 5004, Baulkham Hills, NSW 2153, call (03) 9633-0444, fax (03) 9012-4107, or e-mail Visit Fluke’s web site at



About Fluke

Fluke Corporation is a leader in precision calibration instrumentation and software for electrical, temperature, pressure, flow, and RF measurements. Calibration products from Fluke and its Hart Scientific and DH Instruments Divisions are found in calibration facilities around the world, including National Metrology Institutes, that demand the highest levels of performance and reliability, backed by state of the art metrology and uncompromising support. They are relied on by quality engineers, calibration technicians, and metrologists to instill confidence in the measurements that are critical to their organisations for quality, safety, reliability, and cost. In the past five years, Fluke tools won more than 50 industry awards, including Test and Measurement World Best in Test, Control Engineering Engineer’s Choice, and Plant Engineering Product of the Year. Fluke is a registered trademark of Fluke Corporation in the United States and/or other countries. The names of actual companies and products mentioned herein may be the trademarks of their respective owners.