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2 Introduction and specifications
2.1 Introduction
The Hart Scientific family of Super-Thermometers long ago established the standard for easy-to-use, precision
temperature measurement instrumentation. Laboratories worldwide have selected the Super-Thermometer not
only for the assurance of achieving high-quality results, but also for the innovative features that increase pro-
ductivity in the lab. The Hart Scientific 1594A and 1595A Super-Thermometers continue this legacy adding
new patent pending measurement technology and features that truly are best in class. Below is a summary of
key capabilities and features.
Typical 1595A accuracy 0.2 ppm (0.05 mK), 1594A accuracy 0.8 ppm (0.2 mK)
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Sample rates as fast as 1 second
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Measures SPRTs, HTPRTs, PRTs, and thermistors
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Four input channels on the front panel accept most probe terminations with the patented DWF, gold-
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plated, tellurium-copper, quick-connect terminals
Configurable standby current for each input channel minimizes self-heating transients when scanning
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between channels
Two input channels on the back panel, dedicated for external standard resistors, keep the front panel
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inputs free for Reference Thermometers or Standard Resistors and UUTs
Channel Select Keys above each input channel change color to indicate whether a channel is actively
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measuring, in standby, or inactive—pressing a channel key activates the selected channel
Temperature-controlled internal reference resistors allow for traceable temperature and absolute
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resistance measurements in ambient conditions from 15 °C to 30 °C
Patent pending, Ratio Self-Calibration performs a linearity check or calibration of the Super-
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Thermometer ratio accuracy without the need of any external equipment
Automated Zero-Power Measurement allows for determination and/or cancellation of a thermometer's
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self-heating error
Updated computer interface with USB control, RS-232, and IEEE-488 included as standard
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Ethernet connection allows for remote view of the Super-Thermometer's display from a web browser
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USB memory device on the front panel to accommodate data logging, transfer of probe parameters, and
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storage and retrieval of Super-Thermometer user configurations
VGA output allows the Super-Thermometer's screen to be displayed on a VGA monitor
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Selectable operating language: English, Chinese, Japanese, Spanish, French, German, or Russian
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Intuitive User Interface makes the Super-Thermometer easy to configure and use right out of the box
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2.2 Specifications
2.2.1
General
Current best practices in metrology require uncertainty analyses to be in compliance with the ISO Guide to the
Expression of Uncertainty in Measurement (often referred to as the "GUM"). For convenience, the specifica-
tions in this section are listed in k = 2 (95%) coverage and in k = 3 (99%) coverage to allow the user to easily
apply the specifications in an uncertainty analysis.
The following specifications apply after the standard warm-up period of 30 minutes. The Super-Thermometer
is designed to measure with accuracy and stability without the need for internal auto-cal or zeroing routines.
To realize the full potential of measurement ability, accepted metrology practices such as the use of proper
wiring should be adhered to. In addition, it is important to ensure that the instrument is correctly set up.
The specifications are divided into three categories: primary specifications, ancillary specifications, and gen-
eral specifications.
Introductionandspecifications
Specifications
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