AccuBridge® Model 6242DXS Automated Resistance Bridge

  • Resistance and Temperature Applications
  • Range 0.001 Ω to 1 GΩ
  • Voltage to 1000 V
  • Improved Accuracy and Uncertainty
  • Best Accuracy of < 0.015 ppm
  • System Integration with Measurements International (MI) Matrix Scanners and High Current Range Extenders Industry Proven Design and Performance
Features & Benefits

Since its inception in 1987, Measurements International (MI) has been providing customers with the best in resistance measuring equipment.

The NEW 6242DXS is the latest release from MI and based on proven technology within the market and National Metrology Institutes. Since the release of the 6242D bridge over 5 years ago, MI has been able to fully study and understand the full performance characteristics of the unit. The 6242DXS is a special, hand-selected unit with performance enhancements that provide customers with the very best in specifications in the market while maintaining the ability of a 100:1 maximum ratio and capability up to 1 GΩ. Other competitive units can provide high specifications on paper only without proven accuracies. As the world leader in Resistance Metrology, MI continues to set the standard for measurement.

We Believe it is the Best Practice to Ask Your National Metrology Institute (NMI) or Other NMI’s About Resistance Bridge Technology and Who They Recommend!

The AccuBridge® Family of Bridges

The 6242DXS complements the existing line of Resistance Bridges from MI and offers an economical solution for customers who require the highest level accuracies within one unit. And, of course, the original 6242D unit is upgradable to the 6242DXS if needed – offering customers even more solutions for the requirement they have.

When purchasing high-level Metrology Equipment, it is best practice to have it calibrated by an Accredited Laboratory who can verify the specifications. If you are purchasing with only manufacture calibration, make sure to verify the accredited scope of uncertainty first!

The 6242DXS is a high-performance model MI Bridge. It is one of a family of bridges where there are various bridges optimized for different tasks. From measuring Quantum Hall Resistance Standards (QHR) 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. Three different bridge designs 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.

Ratio Range and Accuracy

The 6242DXS DCC with its binary wound current comparator technology balances the current ratio with an effective resolution of 25-bit. It provides ratio measurements with an accuracy of better than 100 ppb with a linearity of better than 5 ppb. The 6242DXS can perform ratio measurements (Rx/Rs) with resistances valued from 0.001 Ω to 1 GΩ range. A line of optional high current range extenders permits measurements down to 1 μΩ for shunt resistance or direct-current current transformer (DCCT) measurement applications.

Automated Resistance Operation

The 6242DXS Bridge itself can ratio a standard resistor with another resistor being tested. Optional 10-, 16- or 20-channel scanners can be used individually or together to connect to up to 40-channels of ratio measurement for up to 40 different test resistors.

The 6242DXS is perfectly suited for front panel operation, or you can team it with MI’s 6242DXS-SW Windows®-based operating software for fully automated measurements, history logging, graphing, and regression analysis. Front panel operation with the 6242DXS’ 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.


The 6242DXS measures both ratio and absolute values. You select functions using the menu on the 6242DXS’ large touch screen display. For absolute measurements, you enter the value and related uncertainty of the standard resistor using the display 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.

The 6242DXS’s low-noise, touch-screen display is interactive with the measurements, as shown in the screen images below. 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.

Summary Tab
The Summary tab displays current measurement data

Table Tab
The Table tab displays a chronological list of measurement data

Graph Tab
The Graph tab displays a graphical representation of the data

Measurement Info Tab
The Measurement Information tab displays measurement parameters

Measurements International provides world-class expertise in DC resistance metrology to National Measurement Institutes (NMIs) primary, and calibration laboratories who need to achieve the lowest possible traceable uncertainty in their measurements and calibration equipment. As your accreditation and global support partner, MI helps ensure your competitive advantage by offering leading product knowledge and applications expertise through coaching, system design, implementation, calibration services, and ongoing expert support.

At MI, it’s not only about the equipment and science; it’s about what you can do
and the ease with which you can do it.

Automatic current reversal ensures that DC offsets and thermals are cancelled out during the measurement. The 6242DXS has a standard (Rs) input and an unknown (Rx) input for measuring the ratio of the two resistors. All resistor connections are made using 4-terminal connections. Calibration verification can be made by performing an interchange measurement at any ratio. The interchange technique works at all ratios.

6242 Windows® Based Operating Software

Measurements International’s 6242DXS-SW Windows®-based operating software features measurements automation, report generation, historical analysis, and tracking and correcting for resistor drift rates.

When you combine the 6242DXS 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.

You can export all data directly to Excel for various test patterns or mainframe applications. Resistor baths (oil or air), instrument controllers, printers, system software, IEEE-488 interface, installation, and training are available for complete system packages.

When you use the 6242DXS in conjunction with our 6011 series of Range Extenders and 6150A Power Supplies, you can extend its range. Our Range Extenders include the 6011D/150 A and 6011D/300 A modules. The range can be extended further to 1 μΩ with our model 6013M/400 A Range Extender, model 6012M/2000 A Range Extender, or model 6014M/3000 A Range Extender.

Nominal Value
Rx Resistance Value
Ratio Specification 6242DXS
1 Ω 0.1 Ω to 1 Ω 1 Ω 10 Ω 100 Ω
0.2 ppm 0.03 ppm 0.03 ppm 0.1 ppm
10 Ω 1 Ω to 10 Ω 10 Ω 100 Ω 1000 Ω
0.1 ppm 0.015 ppm 0.03 ppm 0.1 ppm
100 Ω 10 Ω to 100 Ω 100 Ω 1 kΩ 10 kΩ
0.1 ppm 0.015 ppm 0.03 ppm 0.03 ppm
1 kΩ 100 Ω to 1 kΩ 1 kΩ 10 kΩ 100 kΩ
0.1 ppm 0.015 ppm 0.03 ppm 0.8 ppm
10 kΩ 1 kΩ to 10 kΩ 10 kΩ 100 kΩ 1 MΩ
0.1 ppm 0.1 ppm 0.05 ppm 2.5 ppm
100 kΩ 10 kΩ to 100 kΩ 100 kΩ 1 MΩ 10 MΩ
0.25 ppm 0.5 ppm 0.3 ppm 5 ppm
1 MΩ 100 kΩ to 1 MΩ 1 MΩ 10 MΩ 100 MΩ
1 ppm 1 ppm 2 ppm 8 ppm
10 MΩ 1 MΩ to 10 MΩ 10 MΩ 100 MΩ
3 ppm 2 ppm 7 ppm
100 MΩ 10 MΩ to 100 MΩ 100 MΩ 1 GΩ
7 ppm 8 ppm 8 ppm


Test Current Specification Test Voltage
Usable Range 10 µA ~ 150 mA Vdc Range
(±1 mA Compliance)
0 ~ 1000 Vdc
Resolution (µA) 1 µA Resolution (V) ~ 4 V
Accuracy Error (%) ± 100 ppm ± 10 µA Accuracy Error (%) ± 0.2 % of full-scale
voltage output


Resistance Ratio Range 0.001:1, 0.01:1, 1:1, 10:1, 100:1 Test Voltage Range 1 V to 1000 V
Linearity ± 0.01 ppm Current Reversal 4 to 1000 seconds
Resolution ± 0.0001 ppm of full-scale Time to Stated
Accuracy (warm-up)
< 1 minute
Input Channels 2 (expandable to 40 with 4220A Matrix Scanner) Temperature
±< 1 minute
Configuration 4-Terminal Mode of Operation Front panel control or
automatic (IEEE-488)
Test Current Range 1 μA to 150 mA Operating Environment 15 – 34 °C, 10 to 90 % RH
Extended Test
Current Option
150 mA to 3000 A Warranty 2 Year Parts & Labour

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