Skip to content
tegam ®

AC Ratio Decade Transformers


AC Ratio Standard, 7 Decades

AC ratio decade transformers are critical tools for precise calibration and testing of electrical equipment. Engineered to provide accurate voltage and current ratios across a range of values, they offer unparalleled accuracy and linearity calibrating and verifying electrical parameters. With ratios selectable through rotary switches, they enable precise simulation of a large variety of values.



  • Resolution 0.1 ppm
  • Terminal linearity 0.9 ppm
  • Bandwidth 50 Hz to 20 kHz
  • Ratio range from -0.0111111 to +1.1111110


  • Parallel switches reduce contact resistance
  • Switch Resistors virtually eliminate switch transients
  • 1 year warranty
  • Assembled in USA


Basic Accuracy/Linearity: 0.00009%
Frequency Range: 50 Hz to 20 kHz
Ratio Range: -0.0111111 to +1.1111110
Resolution (°C): 1 x 10⁻⁷

Stock Check

Model Number
Basic Accuracy/Linearity Frequency Range Ratio Range Resolution Buy
DT72B Active, Contact Us
AC Ratio Standard, 7 Decades
0.00009% 50 Hz to 20 kHz  -0.0111111 to +1.1111110 1 x 10⁻⁷ Buy



Our worldwide service centers provide fast cycle times, use only AE-qualified parts, and follow the original product's specifications and test procedures for the highest quality repair or calibration.

Agreement Term Options

Calibration and Alignment

Advanced Energy has the tools and processes to ensure your equipment continues to meet its original specifications.  Our products are calibrated at global AE service sites with proprietary technology designed to exceed industry standards​.

Agreement Term Options

24/5 Support Available

Get Expert Advice From Our Engineers

We are committed to providing excellent customer service and technical support to our customers. With live chat and phone support, you can reach out to a qualified engineer for help at any time.
Get Support Now