AccuBridge® 6010D

Automated Primary Resistance/Thermometry Bridge

  • Resistance and Temperature Applications
  • Range 0.001 Ω to 100 kΩ
  • Accuracy < 30 ppb
  • Ratio Self-Calibration
  • System Integration with Measurements International (MI) Matrix Scanners and High-Current Range Extenders
  • Make MI Your Partner in ISO 17025 Accreditation Through Coaching, System Design, Implementation, Calibration Services, Documentation Support and Ongoing Expert Support
Features & Benefits
Feature Benefit
DCCT based. Provides excellent stability and range linearity.
Fast reversal rates. Reversal rates as fast as 4 seconds without affecting bridge accuracy.
Extremely low uncertainty. Allows sub-ppm high current measurements.
Includes automation software. 6010D-SW allows complete control of all resistance measurements and parameters.
National and primary lab continuity. Used by all DOD, DOE, NMI’s and space organizations.
Up to 10,000 Amps! Can be expanded for shunt calibrations and DCCT’s.
Dual use operation. Use for resistor maintenance or measuring SPRT’s.

The AccuBridge® 6010D Resistance Bridge (furthermore 6010D) is the metrologist’s choice for primary lab level resistance measurements. Recognized as the world’s leading Automated Resistance/Thermometry Bridge, the 6010D is ideal for resistance measurements in both resistance metrology and temperature thermometer applications. With its innovative technology, the 6010D’s speed, measurement accuracy, and data handling capabilities make it the preferred primary resistance measurement system in National Measurement Institutes (NMIs) and other primary labs worldwide. The 6010D is designed for flexibility and ease of use.

Ratio Range and Accuracy

The AccuBridge® Direct Current Comparator (DCC) with its binary wound current comparator technology balances current with an effective resolution of 25-bit. It provides ratio measurements with an accuracy of better than 30 ppb. It covers a ratio range of from 14:1, with a linearity of better than 5 ppb. The 6010D can perform ratio measurements with resistances valued from 0.001 Ω to 100 kΩ. A line of optional high current range extenders permits measurements down to 1 μΩ for shunt resistance measurement applications.

Automated Resistance Operation

The 6010D Bridge itself can ratio a standard resistor to another resistor being tested. Optional 10-, 16- or 20-channel scanners can be used individually or together to connect to up to 80 channels of ratio measurement for up to 40 different test resistors to be calibrated.

The 6010D is perfectly suited for front panel operation or you can team it with MI’s 6010 SW Windows®-based operating software for fully automated measurements, history logging, graphing, and regression analysis. Stand-alone operation with the touch-sensitive display panel provides full-bridge capabilities to the operator. The ratio or direct resistance measurements can be made. Multiple measurements over time can be numerically displayed or graphically displayed to best fit your needs.

Automated Temperature Operation

Measurements International’s Accu-T-Cal™ SW is a software package for the automation of measurements and calibration of platinum resistance thermometers using the 6010D as the measurement device. Accu-T-Cal™ SW is based on over 15 years of experience and research of metrologists from the Laboratory of Metrology and Quality, Faculty of Electrical Engineering, University of Ljubljana (UL-FE/LMK).  All measured data is available in a graphical and tabular format and is automatically saved for detailed analysis and calibration report generation.

The AccuBridge® Family of Bridges

The 6010D is a high-performance model MI Bridge. One of a family of bridges where there are various bridges optimized for different tasks, from measuring Quantum Hall Resistance (QHR) standards over a smaller range of resistance but with excellent uncertainties, to others which are a better fit for other labs with a broader range of measurements but with larger uncertainties. There are three different bridge designs that use different measurement methods to measure over 21 orders of magnitude of resistance, from 1 μΩ to 10 PΩ. The AccuBridge® family offers the best line of bridges available for measuring the widest range of resistance.

The 6010D measures both ratio and absolute values. You select functions using the menu on the large touch-screen display. For absolute measurements, you enter the value and related uncertainty of the standard resistor using the display’s keypad. You enter the measurement functions such as current through the unknown resistor, settle time, number of measurements, and number of statistics the same way.

You can verify the calibration accuracy by performing an interchange measurement at any ratio. The interchange technique works at all ratios from 14:1.

The 6010D’s low-noise, touch-screen display is interactive with the measurements, as shown in the screen images in Software. When a reading is complete, the average value and uncertainty (based on the number for statistics) are displayed. All uncertainty calculations are 2 sigma level.


Windows®-Based Operating Software

Measurements International’s AccuBridge® 6010 SW Windows®-based software features measurement automation, report generation, historical analysis, and tracking and correcting for resistor drift rates. When you combine the 6010D with an MI IEEE-controlled 9400 Standard Resistor Oil Bath or 9300A Air Bath, you can automatically perform alpha and beta calculations on resistors under test.

The Summary screen displays data for both ratio or resistance
The Summary screen displays data for both ratio or resistance

The Measurement Info screen displays the measurement parameters
The Measurement Info screen displays the measurement parameters

You can export all data directly to Excel® for various test patterns or mainframe applications. External atmospheric pressure, humidity, and temperature indicators are optional, and the entire system can be enclosed in a 4 or 5 ft (1224 to 1530 mm) rack. Resistor baths (oil or air), instrument controllers, printers, system software, IEEE-488 interface, installation, and training are available for complete system packages.

The 6010 SW features both a standards ID file (Rs) and an unknown resistor ID (Rx) file for storing the resistor information and data to help protect the standard resistor data from being overwritten. The 6010 SW software provides the ultimate programmability and control for all your resistors and temperature calibrations.

The range of the 6010D can be extended with our 6011D series of Range Extenders and 6100 series of Power Supplies. Our Range Extenders include the 6011/150 A and 6011/300 A modules, see figure 1, where connections are made on the front of the rack using cables or braided cables. The 6011D/150 A range can be extended further to 1 μΩ with our model 6013M 400 A Range Extender, model 6012M 1000 A Range Extender, model 6012M 2000 A Range Extender, or model 6014M 3000 A Range Extender, see figure 2. For these shunt systems, the connections are made on the side of the rack using copper plates. Copper plates ensure no losses in the cables. Copper extender plates are available for connecting the shunts directly to the system. Controllers may also be added directly to the system.

System & Rack Menu Computer Screenshot
System & Rack Menu

Resistor ID Menu
Resistor ID Menu

Program ID Menu

Measurement Menu

History Menu Computer Screenshot
History Menu

Measurement Options Computer Screenshot
Measurement Options

Self-calibration ratio bridge where the ratio accuracies
can be verified at
anytime using the
interchange technique
method for 1:1 ratio
measurements with
the following equation
re=(Ra-1/Rb)/2. Uncertainties follow GUM at 2 sigma level (95 %) along with degrees of freedom.
Range Accuracy With Range Extender
10 µΩ to 100 µΩ N/A < 0.5 × 10-6
100 µΩ to 1 mΩ N/A < 0.4 × 10-6
1 mΩ to 10 mΩ < 5.0 × 10-6 < 0.3 × 10-6
10 mΩ to 100 mΩ < 0.5 × 10-6 < 0.2 × 10-6
100 mΩ to 1 Ω < 0.03 × 10-6 < 0.2 × 10-6
1:1 Ratio Accuracy 10:1 Ratio Accuracy
0.1 Ω to 0.1 Ω < 0.1 × 10-6 0.1 Ω to 1 Ω < 0.03 × 10-6
1 Ω to 1 Ω < 0.03 × 10-6 1 Ω to 10 Ω < 0.03 × 10-6
10 Ω to 10 Ω < 0.03 × 10-6 10 Ω to 25 Ω < 0.03 × 10-6
25 Ω to 25 Ω < 0.03 × 10-6 10 Ω to 100 Ω < 0.03 × 10-6
100 Ω to 100 Ω < 0.03 × 10-6 100 Ω to 1 kΩ < 0.03 × 10-6
1 kΩ to 1 kΩ < 0.03 × 10-6 1 kΩ to 10 kΩ < 0.03 × 10-6
10 kΩ to 10 kΩ < 0.1 × 10-6 10 kΩ to 100 kΩ < 0.1 × 10-6

General Specifications

Measurement Mode 4-wire
Linearity < 0.005 ppm
Temperature Coefficient < 0.01 ppm/°C
Test Current Range 10 µA to 200 mA (Internal) with 24.9 V Compliance
Test Current Accuracy 100 ppm +10 µA (Full-range)
Test Current Resolution 1 µA
Automatic Current Reversal 4 to 1000 Seconds
Interface IEEE-488
Operating Line Voltage 100 V, 120 V, 220 V, 240 Vac ± 10 % 1-Phase
Display Touch-screen display (no external keyboard), resolution 0.001 ppm
Touch-Screen Menu Operation The touch-screen menu operations are the same as the software and provide key measurement functions such as display resolution; filtering; display of ohms or ratio, or both; viewing of data graphical or statistical, or both; doubling of power by √2, or dividing of power by 1/√2. These functions are both manual and automated.
Measurement Setup Measurement setup parameters include internal current outputs to 200 mA extended current outputs to 150 A or higher. Measurement setups are identical for manual as well as software operation.
Display Operation The display is a 7″-touch-screen display for entering the measurement setup parameters and displaying the data in real-time graphically, statistically, or both. The touch-screen can be used to save all data to the front panel USB.
Free Running The bridge is capable of free running in order to trim potentiometers, decade boxes and other resistive adjustments.
Terminals Tellurium-copper gold plated binding posts.
USB USB features data storage and software upgrades.
Operating Temperature 23 ± 5 °C.

Note 1: Linearity of the bridge can be verified at any time using the built-in calibration function

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