Phone: 801-763-1600
Fax: 801-763-1010
Phone (toll free): 800-438-4278
E-mail: info@hartscientific.com

1594A and 1595A Super-Thermometer Bridge

• Features
• Specifications
• Ordering Information
• Download a full feature brochure and manuals

Super-Thermometer Features at a glance

• Calibrate SPRTs, PRTs, RTDs and thermistors (0 Ω to 500 kΩ)
• Accuracy as good as 0.06 ppm (0.000015 °C)
• “Ratio Self-Calibration” verifies and calibrates resistance ratio accuracy
• Automatic zero-power measurements calculate thermometer probe self-heating
• Temperature-controlled internal reference resistors
• Calibrated sensing current lowers overall instrument uncertainty
• Four input channels on the front panel accept sensors under test or external references
• Two dedicated external reference input channels on the rear panel
• Standby current reduces transient effects when scanning between channels
• Channel Select keys turn measurement mode on or off at the touch of a button
• Sample rates as fast as one second
• USB data transfer and computer control
• Remote view and device control via Ethernet
• Compatible with MET/TEMP II automated calibration software and LogWare II multi-channel, real-time data acquisition software

The Fluke 1594A and 1595A Super-Thermometers from Hart Scientific combine the accuracy of complex and expensive thermometry bridges with innovative features that simplify measurement processes and provide excellent value.

Thermometry bridge accuracy combined with time-saving features

With temperature-controlled internal reference resistors, six input channels, a large graphical display, and a multitude of temperature-specific measurement functions, calibrating SPRTs, PRTs and thermistors (0 Ω to 500 kΩ) has never been so easy and economical. And with the built-in Ratio Self-Calibration function, you can verify or calibrate the Super-Thermometer's ratio accuracy in-house with the press of a button—no other single thermometry bridge can do so much, so well!

Resistance ratio or absolute resistance measurements: the choice is yours

When your goal is to achieve the highest measurement accuracy possible, you will most likely make a resistance ratio measurement (Rx/Rs). The measurement accuracy of the 1595A over typical thermometry ratios (0.25 to 4.0) is as good as or better than 0.2 ppm. And for ratios near unity (0.95 to 1.05), the resistance ratio accuracy of the 1595A is as good as 0.06 ppm. You get the linearity of a traditional resistance bridge with an instrument that is easier to use and a much better value.

Although a ratio measurement can produce the most accurate results, it may not always be the most convenient measurement method. Using the temperature-controlled internal reference resistors, the Super-Thermometer can convert an absolute resistance measurement to a temperature unit and display the result in degrees Celsius or Fahrenheit, Kelvin or Ohms. Each Super-Thermometer includes internal reference resistors of 1 Ω, 10 Ω, 25 Ω, 100 Ω and 10 kΩ that support a variety of PRTs, RTDs and thermistors.

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. Under similar measurement parameters, the noise level of the Super-Thermometer can be as low as a traditional, and much more expensive, resistance bridge.

Unprecedented measurement speed

Super-Thermometers offer speeds as fast as one second per measurement (full accuracy with a two-second sample period). You can complete your tests in less time, track temperature changes more accurately, and even evaluate thermal response in sensors.

Ratio Self-Calibration

• Automatically test or calibrate the Super-Thermometer’s resistance ratio linearity without expensive external equipment
• Detect possible equipment failures before they affect your measurements
• No special operator training required. Complete the test in approximately 30 minutes
• Extend the interval between calibration cycles

Verify ratio accuracy in-house with Ratio Self-Calibration

The 1594A and 1595A feature patent-pending “Ratio Self-Calibration” that enables you 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. The Super-Thermometer performs the Ratio Self-Calibration by automatically combining and switching between the internal temperature-controlled reference resistors to create a resistance voltage divider network. Replacing Rx and Rs with the resistance voltage divider allows the Super-Thermometer to complete a series of eight resistance ratio tests, from which linearity errors are calculated and accuracy relative to specifications can be verified.

Now you can verify accuracy and performance automatically in about thirty minutes, at the touch of a button. No other temperature measurement instrument on the market more fully empowers the metrologist to verify and maintain instrument performance.

Features by the numbers

1. Four front panel input channels feature Hart's DWF, gold-plated, tellurium-copper terminal connectors. These patent-pending terminals are set on a 55° angle, preventing large probe connectors from shorting to adjacent terminals. Configuragble standby current for each input channel minimizes self-heating transients when scanning between channels.

2. A Channel Select key is positioned above each of the four input channels. Pressing any of the four keys will activate or deactivate a channel for measurement and change its color to indicate measurement mode. You can see what mode each channel is in at a glance.

3. The power-standby key lets you turn off the display and disable the front panel keys without disabling power to the internal reference resistor oven. This allows you to use the Super-Thermometer immediately after coming out of standby mode—eliminating the 30-minute resistor oven stabilization time.

4. Log time-and-date-stamped measurements from any channel to a USB memory device connected to the front panel USB input. You can also include useful information, such as ratio, resistance, mean, and standard deviation, with each recorded measurement. Read or write probe definitions, reference resistor definitions, or Super-Thermometer configurations to or from a USB memory device. Store up to 80,000 measurements (about 6 MB) or probe definitions and thermometer configurations to the Super-Thermometer's internal memory for future recall.

5. Graph multiple channels simultaneously. Four statistics fields can be configured to display: mean, standard deviation, standard error of the mean, statistical sample size (n), maximum, minimum, spread and delta (difference between Rx and a user-defined reference value or measurement).

6. Two rear panel imput channels are designated for external reference resistor inputs. With a total of six input channels, you may not have to invest in a multiplexer.

7. The Super-Thermometer comes with USB control, RS-232 serial interface and IEEE-488 parallel communications interface. View and control the Super-Thermometer's display remotely from the web by connecting to the internet via the Ethernet RJ45 jack. Or connect the Super-Thermometer to a standard VGA monitor and view the display from across the lab. Also included is a 2590 multiplexer input for those who may already own the former multiplexer.

Ordering Information

Models

Accessories

Probe Adapters

Standard Resistors*

Software

Calibration Options

Downloads

Right click one of the following links and “Save Target As ...” to download a 12 page brochure with more information or a product User's Guide in Acrobat (.pdf)  format.

• Twelve page brochure with complete ordering information:1594A/1959A Super-Thermometers
• User's Guide, English: 159X____ugeng0000.pdf
• User's Guide, Chinese: 159X____ugchi0000.pdf
• User's Guide, French: 159X____ugfre0000.pdf
• User's Guide, German: 159X____ugger0000.pdf
• User's Guide, Spanish: 159X____ugspa0000.pdf
• User's Guide, Japanese: 159X____ugjpn0000.pdf
• User's Guide, Russian: 159X____ugrus0000.pdf
• Technical Guide, English: 159X____tgeng0100.pdf