6242D Resistance Bridge

Since its inception in 1987, MI has been providing customers with the best in resistance measuring equipment. As the original manufacturer of the Automated Direct Current Comparator (DCC) Resistance Bridge, MI has been the industry leader in providing the highest level of automated resistance bridges and turnkey systems to metrology laboratories worldwide. The 6242D Resistance Bridge is ideal for those laboratories involved in both resistance and temperature measurements that do not require the accuracy level of a national laboratory. There is no point in paying primary dollars for an application that doesn’t require primary specifications.

The AccuBridge® 6242D is ideal for measurements in both resistance metrology and temperature thermometer applications. With its innovative technology, the AccuBridge® 6242D’s speed, measurement accuracy, and data handling capabilities, make it the preferred primary resistance measurement system in primary and calibration labs worldwide. The 6242D is designed for flexibility and ease of use.

Ratio Range & Accuracy-

The AccuBridge® Direct Current Comparator with its binary wound current comparator technology balances current ratio with effective resolution of 25 bits. It provides ratio measurements with an accuracy to better than 10 parts in 10-8 with a linearity of better than 5 parts in 10-9. The 6242D can perform ratio measurements (Rx/Rs) with resistances valued from 0.001 ohm to 100 Mohms (or to optional 1Gohm Range).

A line of optional high current range extenders permits measurements down to 1 micro ohm for shunt resistance or DCCT measurement applications.

Full Featured Standalone or Automated Resistance Operation

The 6242D Bridge itself can ratio a standard resistor to an unknown 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. See the 4200 Series technical data sheet.

The 6242D is perfectly suited for stand-alone operations or you can team it with MI’s AccuBridge® 6242SW Windows®-based Operating Software for fully automated measurements, history logging, graphing, and regression analysis. Standalone operation with the 6242D’s touch sensitive display panel provides full bridge capabilities to the operator. Ratio or direct resistance measurements can be made. Multiple measurements over time can be numerically displayed or graphically displayed to best fit the user’s needs.

The AccuBridge® family of bridges

The 6242D is a secondary performance model of an MI Bridge. One of a family of bridges where there are various bridges optimized for different tasks; from measuring Quantum Hall Resistance standards over a smaller range of resistance. There are three different bridge designs which use different measurement methods to measure over 21 orders of magnitude of resistance, from 1 micro ohm to 10 Peta ohms. The Accubridge family offers the best line of bridges available for measuring the widest range of resistance.

The 6242D is a completely redesigned Resistance Bridge using the new AccuBridge® Bridge technology from Measurements International in providing lower uncertainties, faster measurement rates and more operational capability. It incorporates the most technological advanced design and measurement features of any resistance bridge directed at the Primary or Secondary market.

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

As a stand-alone device, the AccuBridge® 6242D measures both ratio and absolute values. You select functions using the menu on the 6242D’s large touch screen display. For absolute measurements, you enter the value and related uncertainty of the standard resistor (Rs) 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.

  • Range 0.001Ω to 100MΩ
  • Optional Range to 1G
  • 7” touch screen and USB
  • Accuracy < 10 x 10-8 for 1:1 ratios
  • < 10 x 10-8 for 10:1 ratios up to 10KΩ
  • Optional Accuracy < 5 x 10-8 for 10:1 ratios up to 10KΩ
  • Optional Accuracy < 5 x 10-8 for 1:1 ratios up to 10KΩ
  • < 7 x 10-6 at 100MΩ
  • Linearity < 5 x 10-9
  • Binary wound current comparator
  • Manual and Automatic Operation
  • Full system solutions and full system integration with 4200 series of Matrix Scanners and 6011 Range Extenders