Differential Time Domain Reflectometer DTDR-65

Overview & Features

Differential Time Domain Reflectometer DTDR-65  (e.g. for impedance controlled PCBs)

  • 2 differential step generators
  • 2 real-thru sampling modules
  • TDR Step rise time < 65ps (10%-90%)
  • TDR step amplitudes: Uout = 150mV (@50Ohm)
  • Analog input bandwidth ≈ 10GHz
  • Extremely low jitter < 500fs
  • Channel-to-channel skew < 2ps
  • Fully integrated ESD protection module (optional)
  • Lab- & production applications
  • Dimensions 221x210x74mm3, weight 2800g
  • High temperature stability from 0°C to 40°C
  • No external components
  • USB-interface 
    (further interfaces upon request)
  • Further accessories you find here

Product Specification

Outstanding Temperature Stability & Jitter-Performance

The Sequid DTDR-65 is optimized for an extremely stable operation. Due to sophisticated time base generation techniques in combination with proprietary correction algorithms the DTDR-65 (see also STDR-65) features a vertical and horizontal stability, which is usually reserved for the high-price segment: the random jitter is Jrms<500fs and the amplitude noise below Vrms<500µV. Furthermore, the DTDR-65 grants this stability over a wide temperature range without the need for recurring calibrations, making it absolutely unique.

Software & Plug-ins

Beyond the traditional TDR technique the DTDR-65 provides further functionalities (available as software modules) as e.g. differential impedance measurements, fault detection & localization, dielectric constant of prepregs & cores, scattering parameter measurements (S11) and dielectric measurements (εr — see also dielectric spectroscopy page) up to the GHz frequency range. Thus the DTDR-65 can be used in a wide variety of applications.

The following software modules are available for the DTDR-65:

  • Spatial differential impedance control (incl. standard DTDR)
  • Spatial single-ended impedance control (incl. standard TDR)
  • Differential and single-ended S11-scattering parameter measurements up to 10GHz (magnitude, phase, Smith-Chart, VSWR)
  • Single-ended S-parameter measurements up to 10GHz (magnitude, phase, Smith-Chart, VSWR)
  • Fault detection & localization*
  • Single-ended transmission measurements (TDT only)
  • Measurement of dielectric constant of prepregs & cores
  • Frequency dependent measurement of dielectric constant of prepregs & cores (10MHz to 5GHz)
  • Complex permittivity measurements (real, imaginary, Cole-Cole)

*Further information about the topic automated fault detection & localization you obtain from the Sequid high frequency experts. Please contact us directly, we will be pleased to assist you.

Interfaces & Libraries

To support automatic measurements in the lab and in an industrial environment, Sequid offers extensive software support. In addition to the standard delivered graphical user software to perform measurement series and to control the instrument, specially adapted software libraries are provided upon request, enabling the user to integrate the DTDR-65 completely in existing test setups within the accustomed software environment.

Fields of Application

  • Differential line impedance measurement (PCB's, cables, connectors)
  • Differential and single-ended TDR applications
  • Return loss (RL) and insertion loss (IL) measurements
  • High frequency S-Parameter measurements
  • Fault detection & localization
  • εr-measurement of prepregs & cores
  • Moisture measurement
  • Testing of electrical connections
  • Dielectric spectroscopy


Further Information

Further information about TDR, impedance control, fault detection, & localization and dielectric spectroscopy can be found in our download area.