Time Domain Reflectometer (TDR) Cable Analyzer - MOHR CT100B

CT100B TDR Cable Analyzer

High-Resolution TDR with Frequency-Domain Analysis!

CT100B Features/Improvements

  • New multicore CPU up to 300 times faster than the CT100
  • 16 times more RAM memory than the CT100
  • Subpixel sampling --> every cable fault is visible at every scale
  • Arbitrary length waveforms up to 1.5 million points
  • Calibrated S-parameter measurements
    • Real-time frequency domain measurements
    • Return loss (S11)
    • Cable loss / insertion loss (S21)
    • S11 Between Cursors time-windows the feature of interest
    • Smith charts to simplify complex impedance matching problems
    • Normalized TDR traces with adjustable rise time
  • Optimized menu system to simply common tasks such as connecting to CT Viewer and scanning cables.
  • New on-screen help library.

Limitless Applications

  • Tests all types of cable and connectors
    • Coaxial cable
    • Twisted-pair cable
    • Multiconductor cable (e.g. MIL-STD-1553B, MIL-STD-38999)
  • 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.
  • Aging Aircraft
  • CATV, Power, Telephony
  • Naval / Marine
  • Wireless Infrastructure
  • PCB Characterization
  • Soil Moisture, Geophysics

Other Great TDR Features

  • Two independent cursors simplify differential impedance, return loss, and distance-to-fault measurements.
  • Layer-Peeling reduces TDR waveform impedance errors caused by multiple reflections.
  • ZTrace nonlinear transform displays impedance waveform in Ohms.
  • Intermittent Fault Detection displays probability density or min/max envelope with impedance-at-cursor.
  • Enhanced Calibration provides the industry's best impedance accuracy.
  • AutoFit button fits any cable to the screen automatically.
  • Configuration library makes repeat measurements as easy as a press of a button.
  • 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.

Ergonomics and Ease of Use

  • 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

  • CT100B-BNC, 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-SMA, 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 CT100B-SMA featuring the fastest TDR system risetime, ideal for testing high-frequency cables and interconnects.

Standard Accessories (included with instrument)

  • CT Viewer 2 TDR Waveform Analysis Software Package
  • CT100B Operator's Manual
  • CT Viewer 2 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.
  • 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
  • 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.

Key Specifications

  • Industry's only high-resolution portable TDR - resolves connector detail (<1 cm)
     (At least 8-10x sharper spatial resolution than competing TDR instruments [<200 ps rise time*]; catch subtle changes before they cause system failure)
  • Industry's only portable TDR with frequency-domain measurements (return loss [S11], cable loss [S21])
  • Much faster and easier to use than VNA with much 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 TDR exceeding all Tektronix® 1502C TDR specifications

High-resolution TDR comparison of SMA and BNC connectors.

High-Resolution TDR. Confidently characterize normal cables and connectors so that you can identify impedance abnormalities early. The BNC (black) and SMA (red) connectors show approximately 0.8 Ω and 0.4 Ω excess impedance, respectively.

Subpixel sampling ensures that every detectable cable fault is visible at every horizontal scale.

Subpixel Sampling. Subpixel sampling ensures that every detectable cable fault is visible at every horizontal scale. The figure shows effect of subpixel sampling on an 820 ft. (250 m) cable with highlighted 8 Ω fault detected using subpixel sampling.

TDR S11 Return Loss plot showing 2.4 GHz WiFi patch antenna with 21.5 dB return loss from 2.3-2.7 GHz.

S-Parameter Frequency Domain Measurements. The figure shows S11 Return Loss plot (orange) and TDR waveform(red) of a 2.4 GHz WiFi patch antenna, showing average return loss of 21.5 dB from 2.3-2.7 GHz.

S11 return loss between cursors de-embeds / time-windows the feature of interest.

S11 Return Loss Between Cursors. The CT100B TDR provides the unique ability to time-window or de-embed the feature of interest such as a connector or cable fault increasing measurement accuracy. In this case the figure shows cursors selecting an SMA connector with corresponding time-windowed S11 return loss plot.

Smith Chart Display of Frequency-Domain Data

Smith Chart Display of Frequency-Domain Data. Use Smith charts to simplify complex impedance matching tasks. Measure complex impedance at the cursor position. The figure shows Smith chart of a 200 Ω terminator with cursor at 0.0 MHz.

Intermittent / Transient Fault Detection

Intermittent / Transient Fault Detection. Use the CT100B's Envelope mode to capture transient faults down to 2 ms temporal resolution. The figure shows intermittent fault detection with left cursor at the fault location.

MOHR CT100B vs. Tektronix® 1502C

SpecificationMOHR CT100BTektronix® 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, FFT, S-paramters, many otherssmooth
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 CT100B TDR Cable Analyzer Datasheet (6/13/16).

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]