CT100 Automated Metallic Time Domain Reflectometer (TDR) Cable Tester

CT100 Series Metallic TDR Cable Testers

Next-gen Time-Domain Reflectometers replace the Tektronix® 1502C

The new CT100 and CT100HF are the industry's highest-resolution portable metallic TDRs, designed for testing all coaxial and twisted-pair cables and interconnects used in modern microwave/RF and digital systems. These are the only portable instruments that exceed all TDR specifications of the Tektronix® 1502C Metallic TDR Cable Tester, while providing next-generation improvements in TDR analysis, data storage, connectivity, and ergonomics.

CT100 Series TDRs feature 8-10x sharper spatial resolution and 100-1000x better Distance-to-Fault (DTF) resolution than competing TDR instruments, and have multi-GHz bandwidth similar to competing FDR (Frequency-Domain Reflectometer) instruments with similar or better cable fault sensitivity and orders-of-magnitude better DTF precision.

These instruments' unique combination of fast system risetime, high-resolution timebase, and precision 16-bit impedance measurements allow you to identify and correct subtle changes in cable and connector performance before system failure. Some of the CT100 Series' innovative features are described below. Also, please read CT100 Series Features for more information.


  • Test all common coaxial and twisted-pair cable types, and many other types of cable and wire.
  • Detect and precisely locate opens, shorts, kinks, taps, shield damage, thermal damage, sunlight/UV damage, water ingress, loosened or corroded interconnects, poor-quality cables and connectors, and anything else that affects system performance.
  • CATV, Power, Telephony
  • Naval / Marine
  • Aerospace / Aviation
  • Wireless Infrastructure
  • PCB Characterization
  • TDR Sensor Applications (Soil Moisture, Geophysics)
  • Remote monitoring applications

TDR Specifications

  • Step-rise, as low as 60 ps risetime (20-80%, CT100HF)
  • Test frequencies extend to > 8.3 GHz (CT100HF)
  • 500 Hz framerate to capture transient faults.
  • 75 µm (0.003 in) horizontal cursor resolution (VoP 0.66)
  • 16-bit sampling for precision impedance measurements

Key features -- see CT 100 Series Features

  • NEW! -- Layer-Peeling dynamic deconvolution transform helps correct for impedance errors caused by multiple reflections.
  • NEW! -- ZTrace nonlinear transform displays impedance waveform in Ohms.
  • NEW! -- Intermittent Fault Detection displays probability density or min/max envelope with impedance-at-cursor.
  • NEW! -- Enhanced Calibration provides the industry's best impedance accuracy.
  • Now in beta status! -- FFT Math Package for estimating frequency-specific return loss/VSWR, insertion loss, cable loss, S11/S22 S-parameters.
  • Live LAN/WAN/Internet streaming and remote control of any CT100 Series TDR. Leverage real-time engineering oversight from thousands of miles away.
  • AutoFit button fits any cable to the screen automatically.
  • 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.
  • Configuration library makes repeat measurements as easy as a press of a button.
  • Download your TDR data to a PC and review it later with the included CT Viewer software.

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.
  • USB peripherals include mouse, keyboard, flash drive, barcode reader.

General TDR Options

  • CT100, 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.
  • CT100S, stainless-steel SMA test port
    • CT100 TDR configured with SMA test port assembly. Represents a balance of performance and electrical overstress protection for field applications where SMA test port is desired.
  • CT100HF, stainless-steel SMA test port
    • Higher-bandwidth version of the CT100S 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.

Standard Accessories (included with instrument)

  • CT Viewer TDR Waveform Analysis Software Package
  • CT100/CT100HF Operator's Manual
  • CT Viewer User Guide
  • Rugged Soft-Sided Carrying Case
    • Plenty of 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.
  • Impedance Matching Adapter Kit
    • Not necessary for routine testing of non-50 Ω coaxial cable, but 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
  • External Battery Pack (2700 mAh)
    • Coming soon. Indefinitely extend the battery life of your instrument with hot-swappable NiMH battery packs. Rugged clamshell construction securely fastens to the top of the instrument.

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.

Mohr CT100 vs. Tektronix® 1502C

SpecificationMohr CT100Tektronix® 1502C
Risetime, ps* (20-80%)100 (CT100)
60 (CT100HF)
Pulse amplitude
(into 50Ω load)
300 mV300 mV
Sequential sampling rate2 - 250 kHz12.5 kHz
Sampling resolution16 bits12 bits
TDR frame rate500 fps25 fps
Horizontal scale0.003 - 200 ft/div
(0.001 - 50 m/div)
0.1 - 200 ft/div
(0.03 - 50 m/div)
Horizontal range0 - 30,000 ft
(0 - 9 km)
0 - 2000 ft
(0 - 0.6 km)
Horizontal resolution0.003 in (0.075 mm)0.05 in (1.2 mm)
Vertical scale0.5 - 500 mρ/div0.5 - 500 mρ/div
Battery life> 6h> 5h
Battery recharge< 3h< 20 h
I/O optionsUSB host/client
10/100 Ethernet
Thermal printer
optional RS-232, Ethernet
Data storageThousands of tracesTemporarily store single trace
Network integration10/100 Mb EthernetNone
Display4.3" 480x272 backlit color TFT-LCD4.7" 256x130 backlit mono LCD
TDR trace displayUnlimited2 traces
TDR digital filteringsmooth, subtract, derivatives, FFTsmooth
Unit Weight4.7 lb (2.2 kg)23 lb (10 kg)
* Typical system risetimes as measured at the reflected rise.

Testable cable length may be limited by cable signal attenuation characteristics. Typical twisted-pair and coaxial cables are evaluable to at least 10,000 ft (3.0 km).

The CT100 can operate for an unlimited period with optional hot-swappable external rechargeable battery packs.


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