AccuBridge® 6020T Series

  • Best Accuracy ± 0.015 ppm from 1 Ω to 10 kΩ
  • Quick Measure Mode Under 20 Seconds to First Reading
  • Current Reversal Rate of 2 Seconds
  • Measurement Rates as Fast as 0.1 Seconds
  • ADCC Technology
  • Proprietary Comparator Design
  • 0.01 Ω to 100 kΩ Range
  • Linearity < 0.005 ppm
  • IEEE-488 and Manual Operation
  • Accu-T-Cal™ Application Software For Calibrating PRTs Designed by NMI
  • 6-Channel Front Panel with Keep Warm Currents!
  • Keep Warm Current 1 mA
  • Smaller Design for Improved Quality and Performance
Features & Benefits

The AccuBridge® 6020T Thermometry Bridge (furthermore 6020T) is the metrologist’s choice for primary lab level thermometry measurements. With its innovative technology, the 6020T’s speed, measurement accuracy, and data handling capabilities make it the preferred primary thermometry measurement system in National Measurement Institutes (NMIs) and other primary labs worldwide. The 6020T was designed for flexibility and ease of use. The 6020T features increased ampere-turn (AT) sensitivity with more turns on both the master and slave windings and a voltage feedback circuit to improve on the linearity error of the nanovolt amplifier. Also improved is the ratio from the previous 1.5:1 ratio to the new ratio range covering from 0.1 up to a maximum ratio of 5 allowing customers to meet all of their requirements. MI customers now have unmatched features and functionality to support its world-class measurement uncertainty capability.

Quick Measure Mode Provides Customers with the Ability to Have the First Reading Within 20 Seconds from Pressing Start; current reversal rates improved to 2 seconds with measurement sample times as low as 0.1 seconds!

Only MI offers a DC Bridge with these improvements that can meet specifications!

For years customers have been asking for MI to extend the measurement features of the DC Comparator Bridge to replace existing AC technology. MI has finally not only answered these requests with the release of the 6020T, but taken them to the next level.

The 6020T features a Quick Measure mode which allows the bridge to balance faster thus improving the first measurement reading which is displayed within less than 20 seconds from pressing Start!

Next, we focused on the current reversal time. Customers have been requesting that a DC Comparator Bridge meets that again of AC Bridges. We accomplished this with the improved reversal rate function of 2 seconds! MI is the only DC Comparator Bridge that has improved with these features and still meets stated specifications!

Measurement Info Graph


We at MI understand budget limitations for customers and take that into account when designing new products. That is why the 6020T-Base and 6020T-Premium models both equipped with a six-channel front panel design which incorporates a 1 mA keep warm current. No other DCC Bridge manufacturer offers both bridge and scanner in one unit!

If more than 6 connections are required 10-, 16- or 20-channel scanners are available to connect up to 40 test resistors or PRT’s. Please see the model 4210T and 4220T for options. The 4210T, 4220T series of scanners from MI come standard with the “keep warm” current option.

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 to better than 15 ppb (Premium model). It covers a ratio range of 0.1 to a maximum ratio of 5, with a linearity of better than 5 ppb.

The 6020T is perfectly suited for front panel operation (via touch screen) enabling USB single measurement logging. Otherwise, you can team it with MI’s Accu-T-Cal™ application 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. Multiple measurements over time can be numerically displayed or graphically displayed to fit your needs best.


The 6020T is designed in two separate models for users’ specification requirements or budget. The 6020T is available in two models, Base and Premium. The Base version is upgradable at any time to Premium!

The operation of the 6020T Bridges is simple and easy to use. You select functions using the menu on the large touch-screen display. For absolute measurements, 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, the number of measurements, and the number of statistics the same way. The 6020T’s low-noise, touch screen display is interactive with the measurements. When a reading is complete, the average value and uncertainty (based on the number of statistics) are displayed. All uncertainty calculations are 2σ level. 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.

Automated Temperature Operation

Measurements International’s Accu-T-Cal™ is a software package for the automation of measurements and calibrations of platinum resistance thermometers at primary and secondary levels. Accu-T-Cal™ SW is based on over 15 years of experience and research of metrologists from the Laboratory of Metrology and Quality at the Faculty of Electrical Engineering of the University of Ljubljana (UL-FE/LMK).

UL-FE/LMK is the holder of the National Standard for Thermodynamic Temperature in Slovenia.

Accu-T-Cal™ SW has built-in drivers for all Measurements International Temperature and Resistance Bridges as well as the MIL scanners, allowing them to configure multiple PRT’s to be calibrated. Communication with all equipment uses the IEEE-488 bus that comes standard with all MIL equipment.

An intuitive user interface allows configuring the hardware, standard PRT’s as well as DUT’s. The entered parameters are stored for future use or later measurement data analysis.

The SW includes a list of the ITS90 fixed-point cell parameters for use when configuring new measurements.

For more information, please visit and access the Accu-T-Cal™ SW data sheet.

Software 2

Software 4

Measurement Graph

Measurement Info

2 Models To Choose From

We at MI understand budget limitations for customers and take that into account when designing new products. That is why the 6020T-Base and 6020T-Premium models both equipped with a six-channel front panel design which incorporates a 1 mA keep warm current. No other DCC Bridge manufacturer offers both bridge and scanner in one unit!

How to Select

Model 6020T – Premium
Current Reversal Minimum (s) 2
Sample Rate Minimum (s) 0.1
RS value (Ω) Accuracy of Ratio* (× 10-6)
1:1 5:1 1:5
0.1 to < 1 0.015 0.015 0.02
1 to < 10 0.015 0.015 0.02
10 to < 100 0.015 0.015 0.02
1 k to < 10 k 0.015 0.015 0.02
10 k to < 100 k 0.1 0.1 0.2
* Ratio define as (RPRT / RS)


Model 6020T – Base
Current Reversal Minimum (s) 2
Sample Rate Minimum (s) 0.1
RS value (Ω) Accuracy of Ratio* (× 10-6)
1:1 14:1
0.1 to < 1 0.07 0.07
1 to < 10 0.07 0.07
10 to < 100 0.07 0.07
1 k to < 10 k 0.07 0.07
10 k to < 100 k 0.15 0.15
* Ratio define as (RPRT / RS)


Measurement Mode 4-wire
Linearity < 0.005 ppm of full-scale
Operating Conditions 10 °C to 35 °C, 10 % to 90 % RH non-condensing
Test Current Range 1 μA to 200 mA
Test Current Resolution 18-bit
Interface IEEE-488
Display Touch-screen display (no external keyboard), resolution 0.001 ppm

Information Request

  • Please fill in the details below to receive more information on this product

    * = Required Fields