Industry's Highest Resolution Portable Time-Domain Reflectometers

Time Domain Reflectometer (TDR) Cable Tester - MOHR CT100

CT100B with a self-grounding BNC test port

  • Electrically rugged, multipurpose metallic TDR designed for high-resolution testing of a wide range of coaxial and twisted-pair cable types and lengths -- in the field, on the manufacturing floor, or in the lab. Exceeds all Tektronix® 1502C TDR specifications.

CT100B with a stainless-steel SMA test port

  • Improved data signal quality with slightly less electrical overstress protection than the standard CT100B.

CT100HF with a stainless-steel SMA test port

  • Higher-bandwidth version of the CT100 featuring the fastest TDR system risetime, ideal for testing high-frequency cables and interconnects with resolution and precision previously restricted to unwieldly bench-top TDR instruments.

Key TDR Specifications

  • The only portable TDR able to resolve connector detail (<1 cm)
     (At least 8-10x sharper spatial resolution than competing TDR instruments; catch subtle changes before they cause system failure.) High-resolution TDR compared to competitor.

    High-Resolution TDR. The CT100B's high resolution shows connector details that lesser devices completely miss.

  • Much faster and easier to use than a VNA, similar broadband fault sensitivity with orders-of-magnitude better distance-to-fault precision and accuracy
    (NO range/resolution/bandwidth tradeoffs, NO calibration drift)
  • Industry's most accurate impedance measurements
     (16-bit ADC, advanced calibration features)
  • Industry's most accurate cable length measurements
     (25 μm [0.76 ps] cursor resolution)
  • Industry's fastest intermittent fault detection
     (250,000 samples per second, 500 Hz continuous full waveform capture)
  • Industry's only portable TDR exceeding all Tektronix® 1502C TDR specifications


  • Tests all coaxial, twisted-pair, and multi-conductor (e.g. MIL-STD-1553B, MIL-STD-38999) cable types.
  • Detects subtle partial faults, opens, shorts, kinks, taps, shield damage, thermal damage, sunlight/UV damage, water ingress, loosened or corroded interconnects, and poor-quality cables and connectors.
  • CATV, Power, Telephony
  • Naval / Marine
  • Aerospace / Aviation
  • Wireless Infrastructure
  • PCB Impedance Measurements
  • TDR Sensor Applications (Soil Moisture, Geophysics)
  • Remote monitoring applications
  • Tank Farms

Key Software features

  • Two independent cursors simplify differential impedance, return loss, and distance-to-fault measurements. Dual Cursors Simplify Differential Measurements

    Dual-Cursors make comparisons simple. Note the 41.1 Ω difference between the reading of the nominal 50 Ω and 90 Ω cable segments.

  • Save thousands of TDR traces that you can later zoom in/out on, and compare or subtract from live or previously saved traces.
  • Live LAN/WAN/Internet streaming and remote control of any CT100 Series TDR. Leverage real-time engineering oversight from thousands of miles away.
  • Download your TDR data to a PC and review it later with the included CT Viewer 2 software.
  • Layer-Peeling reduces TDR waveform impedance errors caused by multiple reflections.
  • Transform impedance waveform to display in Ohms or VSWR as well as millirho.
  • Intermittent Fault Detection displays probability density or min/max envelope with impedance-at-cursor.
  • Enhanced Calibration provides the industry's best impedance accuracy.
  • FFT Math Package for estimating frequency-specific return loss/VSWR, insertion loss, cable loss, S11/S22 S-parameters.
  • AutoFit button scales the display settings to fit the attached cable.
  • Configuration library makes repeat measurements as easy as a press of a button.

The Mohr CT100/CT100B was chosen as the replacement for the Tektronix 1502/1502B/1502C by the U.S. Navy. The CT100 series TDRs are the only portable TDR cable testers exceeding all of the Tektronix® 1502/1502B/1502C TDR specifications. See comparison.

Designed to be easy to use, as well as accurate

  • Bright 4.3" color TFT-LCD display is easy to read in any environment.
  • Intuitive multifunction key panels simplify TDR use.
  • Lightweight and portable, operates for a full shift without recharging.
  • Integrated 10/100 Ethernet connectivity.
  • Available USB peripherals: mouse, keyboard, flash drive, barcode reader.

Standard Accessories Included with Instrument

  • DVD containing CT Viewer 2™ Software Package
  • CT Viewer 2™ Quick User Guide
  • External AC Power Adapter
  • Rugged Soft-Sided Carrying Case
    • Room for calibration accessories, manuals, and optional small form-factor keyboard.
  • Calibration Verification Pack
    • Precision coaxial test cable and BNC/SMA adapters necessary for verifying TDR instrument calibration and performance.
  • NIST-Traceable Calibration Certificate
  • Standard 12-Month Limited Warranty

MOHR CT100B Standard Package

What's in the box?

Optional Accessories

Impedance Matching Adapter Kit
  • Useful for specialized applications requiring precision impedance matching to the cable / device-under-test (DUT).
BNC Adapter Kit
  • Precision BNC adapters offer direct high-bandwidth coupling for testing most coaxial cables and interconnects
MIL-STD-1553B Data Bus TRB Adapter Kit
  • High-bandwidth controlled-impedance adapter kit for testing TRB(triaxial BNC)-terminated cables such as aerospace MIL-STD-1553B twinax cables
Small Form-Factor Keyboard
  • This popular, recommended accessory simplifies data entry and fits in the instrument's carrying case.

Click here to see the complete list of optional accessories.


4.3(H) x 11.5(W) x 6.9(L) in.
(10.9 x 29.2 x 17.5 cm)


5.1 lbs. (2.3 kg), with cover
4.7 lbs. (2.2 kg), without cover


Operating Temperature: 0°C to +50°C
Non-operating Temperature: -20°C to +60°C


CE compliance logo
Complies with all applicable EU directives, as specified by the Declaration of Conformity supplied with the instrument.

Complies with Canadian ICES-003.

EMC: MIL-PRF-28800F. MIL-STD-461F RE102, CE102. IEC 61000
Shock/Vibration: MIL-PRF-28800F (Class 3)
Temperature/Humidity: MIL-PRF-28800F (Class 3)
Explosive Atm.: MIL-STD-810G 511.5 Procedure 1 (+55°C, 0-4600 m)


pdf icon CT100B Series TDR Cable Analyzers Datasheet

Application Notes

TDR vs. FDR: Distance to Fault (HTML) pdf icon [PDF]

TDR for Microwave/RF and Digital Cables (HTML) pdf icon [PDF]

pdf icon Mohr CT100 TDR and CT Viewer™ Cable and Interconnect Quality Control Example: Interconnect Impedance Profile and Electrical Length Variation in 50 Ohm SMA and BNC Cables

pdf icon AN-2016-1 1553B Data Bus Cable Fault Detection Through Multiple Transformer Couplings

pdf icon AN-2016-2 1553B Data Bus Cable Compression Damage Detection Through Transformer Couplings

How to purchase or rent

For purchasing and rental options, please visit our How to Buy page. For eligible purchasers, the CT100 is NSN listed: (7Z) 6625-01-579-6793.