Cross Hole Analyzer (CHAMP-Q)

Evaluation of concrete quality in deep foundations by the Crosshole Sonic Logging method (CSL)

  • Allows for four probes (six profiles) to be pulled at once for ease and efficiency of data collection
  • Assesses concrete quality and consistency of drilled shafts and other cast-in-place concrete structures
  • Performs real-time analysis on site, as well as data transfer with CHA-W reporting software for additional analysis
  • Available in a 2-channel or a 4-channel system
  • Offers PDI-TOMO, 3-D tomographic software for superior tomographic results of questionable areas

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  • Description
  • Technical Specifications
  • Reference Materials
  • Downloads

The Cross Hole Analyzer determines the quality and consistency of the concrete of drilled shafts, slurry walls, bored piles, cast-in-situ piles and other types of concrete foundations via CSL testing. PDI’s Cross Hole Analyzer (CHAMP-Q) is ideal for testing four probes (six profiles) in just one pull, saving time and money. CHAMP-Q has color coded wires for easy identification of probe receiving/transmitting. The CHAMP-Q meets or exceeds the specifications of ASTM D6760 and several other crosshole sonic logging codes and standards.

Test the entire shaft with CHAMP-Q
Once a shaft is prepared with PVC or steel tubes during construction, transceivers are lowered into the access tubes and probe one will transmit a high frequency signal that travels through the concrete and is detected by the other probes which are acting as receivers. This action is repeated with the other probes being automatically configured as transmitters sequentially allowing up to six profiles to be scanned with a single pull. As these sensors are raised and/or lowered along the length of the foundation, the CHAMP-Q displays and records the strength of the received signal, as well as the time from signal emission to signal arrival as a function of depth.

In CSL testing, scanning various tube combinations for the entire shaft allows evaluation of concrete quality and defect location along the length and by quadrant. With the CHAMP-Q, the user can pull four cables at once, each color coded for easy identification, and via a newly designed, space efficient tri-pod.

The CHAMP-Q Main Unit is portable, light and rugged featuring:

  • Fast and accurate field measurements
  • Large sun light readable color LCD touch screen that is highly visible in all lighting conditions.
    • Optimized data entry for real time analysis onsite (waterfall diagram)
    •  Replaceable battery and USB ports for quick and easy data transfer

CHAMP’s CHA-W Data Processing Software provides powerful tools for data analysis such as:

  • Ability to simultaneously review six data profiles
  • History mapping of already collected data
  • First Arrival Time (FAT) detection
  • Easy defect identification
  • Two methods of signal strength evaluation (energy or amplitude)

CHA-W reporting tools comprise of user customized graphs and tables:

  • Sonic Map – Signal strength versus time and depth in traditional waterfall diagram
  • First Arrival Time – Signal travel time from transmitter to receiver, versus depth
  • Wave-speed Plot – Wave-speed (an indicator of concrete strength) versus depth
  • Wave–speed Table – Wave-speeds, means and standard deviations
  • Energy or Amplitude Plot – Signal strength versus depth
  • Defect location graphically (horizontal redline) and in table format


CHAMP-Q Technical Specifications


CHAMP-Q_Technical Spec Sheet

Main Unit


Size: 320 X 250 X 68 mm (12.6 x 9.8 x 2.7 in)
Weight: 5 Kg (11 lbs.)
Temperature range: 0 to 40°C (32 to 104° F) operating; -20 to 65°C (-4 to 149° F) storage
Display: 26.4 cm (10.4 in), sunlight readable, resolution 1024 X 768
Built in capacitive touch screen
Video Outputs: HDMI
Power: 4-hour continuous data collection with internal 12V battery
Charging Time: 6-hour maximum


Microsoft Windows® 10 or higher Operating System
Minimum of 128 GB SSD internal drive
Ethernet port
4 USB ports
12-bit analog to digital (A/D) converter
Sampling rate: 500 kHz, 1 MHz and 2 MHz; user selectable (equivalent measuring accuracy 2μs, 1μs and 0.5μs)
Scan rate: 32 scans/seconds
Record size: 250, 500 and 1000 points; user selectable
User adjustable gain, trigger level, and transmit power level


Operates in English, Metric or SI Units
Furnished with CHA-W software
Full one-year warranty
Technical manual provided in PDF form on a USB Drive



Size: 245 mm length x 25.4 mm diameter (9.5 in length x 1 in diameter)
Element: ceramic
Housing: nickel plated brass
Independent depth encoder for each probe
Maximum measuring distance (probe separation): 3 m (9.8 ft)


Pressure tested to 175 m (575 ft)
Receiver: tuned to 45 KHz nominal
Transmitter frequency (nominal): 45 KHz
Transmitter voltage: 800 volts


Cable material: heavy duty polyurethane outer jacket
Cable length: 60, 100 or 150 m (196, 328, 492 ft)
Cables spooled over tripod (standard) or with the pile encoder

Purchase of CHAMP system includes technical support