Time Domain Reflectometer (TDR) Cable Tester - MOHR CT100

Industry's Highest Resolution Portable Time-Domain Reflectometers

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.

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)
  • Much faster and easier to use than 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
     (80 μm [760 fs] cursor resolution, 6-digit VoP)
  • Industry's fastest intermittent fault detection
     (250 KSPS, 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, poor-quality cables and connectors.
  • CATV, Power, Telephony
  • Naval / Marine
  • Aerospace / Aviation
  • Wireless Infrastructure
  • PCB Characterization
  • TDR Sensor Applications (Soil Moisture, Geophysics)
  • Remote monitoring applications

The Mohr CT100/CT100B was chosen as the replacement for the Tektronix 1502/1502B/1502C by the U.S. Navy.

The CT100 series are the only portable TDR cable testers exceeding all of the Tektronix® 1502/1502B/1502C TDR specifications. See comparison.

Key Software features -- see CT100 Series Features

  • Two independent cursors simplify differential impedance, return loss, and distance-to-fault measurements.
  • 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 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.

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; use is unlimited with external battery packs.
  • Integrated 10/100 Ethernet connectivity.
  • Available USB peripherals: mouse, keyboard, flash drive, barcode reader.

Standard Accessories (included with instrument)

  • CT100B Operator's Manual
  • CT Viewer™ 2 TDR Waveform Analysis Software Package
  • CT Viewer 2 User Guide
  • Rugged Soft-Sided Carrying Case
    • Room for calibration accessories, manuals, and optional small form-factor keyboard.
  • Calibration 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

Optional Accessories

  • Small Form-Factor Keyboard
    • This popular, recommended accessory simplifies data entry and fits in the instrument's carrying case.
  • Hard Carrying Case
    • Give your instrument the utmost environmental protection with this customized Pelican™ case. Replaces the standard soft-sided carrying case.
  • BNC RF Adapter Kit
    • Precision BNC RF adapters offer direct high-bandwidth coupling for testing most coaxial cables and interconnects: BNC-BNC, N-N, SMA-SMA, BNC-N, SMA-BNC, SMA-N, and SMA-TNC. Comes in a rugged plastic case. Ideal for use with the CT100.
  • SMA RF Adapter Kit
    • Precision SMA RF adapters offer direct high-bandwidth coupling for testing most coaxial cables and interconnects: SMA-SMA, SMA-BNC, SMA-N, and SMA-TNC. Comes in a rugged plastic case. Ideal for use with the CT100HF.
  • NEW! MIL-STD-1553B Data Bus TRB Adapter Kit
    • High-bandwidth controlled-impedance adapter kit for testing TRB(triaxial BNC)-terminated cables including aerospace MIL-STD-1553B twinax cables. Comes in a military-grade environmentally-resistant plastic case. Ideal for use with the CT100 for troubleshooting and maintenance of aging aircraft cable harnesses.
  • Impedance Matching Adapter Kit
    • Useful for specialized applications requiring precision impedance matching to the cable / device-under-test (DUT).
    • Adapter 50 Ω to 75 Ω CT100-AC-I5075
    • Adapter 50 Ω to 93 Ω CT100-AC-I5093
    • Adapter 50 Ω to 125 Ω CT100-AC-I50125


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: -10°C to +55°C (typ. -10°C to +60°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 CT100/CT100HF Automated Metallic TDR Cable Tester Datasheet (1/22/13).

Application Notes

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

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

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

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

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.