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HARDWARE FEATURES

•Engineered frame hardware with finishes designed to withstand harsh outdoor conditions.

•Redundant instrumentation (inclinometer and contacting front-arm) optimizes measured profile.

•Contacting front arm apparatus (unique to CS8800) preserves very short wavelength surface features.

•Adjustable outrigger support wheel for stability and balance.

•Wide true-round tires for ideal measurement footprint.
  •Durable urethane tires stay in-round longer and wear slowly.

•Internal Lithium-Ion battery specified for long duty cycle (>10 hours of testing).
  •Gauge displays battery charge level.

•Modular design for in-field replacement of core components.
  •Modular parts reduce downtime and reduce support.

•Data collection electronics fabricated in ISO 9001 facility.

•Fast, simple assembly (only handle and computer need to be attached).

•Hardware collapses into reusable container for shipping and storage.

•Front and rear lighting for safety and visibility.

•Panasonic Toughbook 19 military specification operator interface computer.  MS-Windows 7 Professional operating system and touch screen controls allow for fast operator training and easy field operation.

•On-site assistance available worldwide for first time set-up, calibration, operator training and follow-on support.

•Low resolution GPS with coordinates integrated with profile stations (chainage) and Google Earth images of profiled areas (optional).

•Survey resolution data and output formats supported with optional integration with RTK corrected GPS or total stations/laser devices.

•High resolution three-dimensional texture measurement with optional line laser (LMI/Selcom RoLine or equivalent).

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SOFTWARE FEATURES

•Easy Windows software operates on touch-screen Toughbook computer (Windows 7 Pro operating system).

•Computer instructed routines for system calibration, data collection, analysis and reporting.

•Real time display of incrementing stations (chainage), device speed, elevation change and profile trace.

•Walking speed data collection allows faster testing than other devices.  (Best results with slower speeds on rough or coarse textured surfaces).

•Default sampling Interval = 1 inch/25mm.
  • Outputs data equivalent to ASTM E950 Class I profiling device.

•Reports IRI, PRI/PI, HRI, MRI, RN, Floor Flatness/Floor Levelness indices, and exact dimensions of localized roughness.

•Instantaneous test results and on-screen viewing of profile traces and reports.

•Multiple profile trace reporting allows side-by-side presentation of parallel profile traces (patented by SSI) with ride index results averaged.
  • Multiple trace output facilitates assessment of roughness laterally across surface.

•Open (one-way) or closed loop data collection methods.
  • Add new data to existing files.

•Stores surface profile (longitudinal or transverse) and elevation data for output in numerous formats.

•Multiple data output formats supported [ERD/PPF for ProVal, Excel (CSV or supplied templates), and PDF images].

•Profile data can be viewed on-screen in field or office, transferred electronically or printed in hard copy.

•Raw data can be reanalyzed repeatedly with different parameters (e.g. English or Metric units, different profile indices, localized roughness templates, data filtering methods).

•SSI Validation Engine software for comparing same surface profiles (for ongoing assessment of CS8800 performance).

•Encrypted raw data assures security and integrity of profile data.

•Software updates by Internet download (self-executing updates overwrite prior versions).

•Guaranteed to meet or exceed industry specifications and test methods.

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TECHNICAL SPECIFICATIONS*

•World Bank Class 1 Instrument.
•Equivalent to ASTME950 Class 1 Profiling Device.

•Data Outputs & Reporting

•Reports: IRI, MRI, HRI, PRI, RN, CA Bridge, FF/FL (Floor Flatness/Floor Levelness), and localized roughness (adjustable bump/dip templates or by IRI thresholds). 
•Outputs: PDF, Excel, ERD/PPF (compatible with ProVal) and raw strip trace.

•Working Surfaces

•All pavement types and textures. 
•Surfaces should be firm and relatively free of stones or debris.  Moisture or dust on surface will not distort measurements.

•Operating Speed

•0.0 to 3 mph (0 to 5 kph).  Walking pace, visual/audible warning for excessive speed.  (Note: slower speed recommended for best results on rougher or coarse textured surfaces, and for preserving accurate changes in elevation).

•Localized Roughness

•Adjustable template for reporting localized roughness by length and height of defect areas.  Bump  and dip areas shown by station (chainage) and location of maximum peak or trough amplitude.
• IRI based reporting of localized roughness.

•Sampling Interval

•Default: 1 inch (25.4 mm).
•Configurable sampling interval supported for custom applications.

•Core Measurements

•True profile; height and slope versus distance.

•Measurement Units

•English/Metric (user-selectable; data is rewriteable to change in units).

•Distance Measurement Accuracy

•+/- 0.025%.

•Height Measurement Precision

•±0.0025mm (±0001 inch) per 254 mm (12 inch) wheel-base.

•Profile Accuracy

•±0.381 mm (±0.015 inch) per 45.7 meters (50 yards).

•IRI Accuracy

•±0 .05 m/km (± 3.0 inches/mile).

•Correlation with Survey Generated IRI

•0.985 cross-correlation achieved on 10 repeat same surface collections (0.1 mile / 161 m test surface marked with paint dots for consistent device tracking). 

•Wavelength Measuring Limits

•~0.45 meters (1.5 feet) to undetermined upper limit (beyond any relevant or useful wavelength).

•Maximum Grade Measurement

•1 in 4.7 or 12 degrees.

•Minimum Path Curvature

•No worse than 15 meters (16 yard) radius.

•Warm Up Time

•~10 minutes or less.

•Power Supply

•12V Lithium-Ion main system battery designed for duration of 10 or more hours of testing time.  Battery duration decreases when Toughbook computer powered from main battery instead of internal battery.

•Weight

•~40 lb/18 kg (without Toughbook computer, battery or reusable storage case).

•34.5” (L) x 18.0” (W) x 12.125” (H) (collapsed, 36.5” with handle extended).

•Temperature

•Operating: 15-140⁰F (-10-60⁰C) (subject to temperature induced irregular surface conditions).  Storage:-50-170⁰F (-30-75⁰C).

•Data Storage

•Typical notebook PC hard drive (160-320GB) has capacity for ~300,000 miles (480,000 km) of raw profile data.  Profile data transferable through industry standard storage media (DVD/flash or portable memory, email etc.) 

•SSI encrypted re-writeable proprietary format.  Export routines supplied for ERD, PPF (ProVal), PRO, ProScan, Excel, and PDF images of profile reports and traces.

•Operator Interface Computer

•Military specification Toughbook 19 with daylight readable Touch-Screen.

•Operator Interface Software

•Microsoft Windows 7 Professional applications for calibration, data collection and analysis.  Feature rich software.  License supplied for Desktop computer use. 

•Optional color sheet-feed or encased thermal printer (with power assisted paper take-up) available.  Supported print driver configurations include wired (USB) and wireless (802.11 and Bluetooth).

* Specifications subject to change without notice.
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OPERATOR INTERFACE COMPUTER

Toughbook 19

Typical Configuration:
Intel Core i5-2520M 2.50GHz processor  with vPro
10.1" TF+XGA Dual Touch Screen with Tilt/Swivel
320GB Shock Mounted Removable Hard Drive
4GB RAM (expandable to 8GB)
Intel WiFi (802.11 a/b/g/n), Bluetooth
Multiple Ports (DB-9, USB, Ethernet, SD Memory Card)
Windows 7 Professional
Toughbook Preferred

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PROOF OF PERFORMANCE

CS8800 DATA REPEATABILITY, ACCURACY & CROSS-CORRELATION

The SSI CS8800 Walking Profiler system has the proven ability to generate highly accurate and closely repeatable surface profile data. The graphs below were generated based on comparison of CS8800 walking profile data consisting of repeat data collections from the same surface. The images below report results from six same surface data collections(1) along a 541 foot (165 meter)  concrete surface. (2)  Four categories of performance are presented: (1) Proof of Accuracy, (2) Proof of Repeatability, (3) Cross-Correlation of CS8800 Data, and (4) IRI Test Result Comparisons. 

1. Proof of Accuracy  Figures 1 and 2 below show a comparison of same surface data from the CS8800 compared to independent survey data.  The accuracy comparison shown in Figure 1 depicts an excellent point-to-point comparison between the various individual collections, with no absolute difference greater than 34 mils.  Figure 2 shows a close up comparison of CS8800 data (the blue trace) overlaid on the reference survey profile with exact precision.  On a running point-by-point comparison, the accumulated difference between the CS8800 system’s profile and the survey profile is 23.8 mils (0.0238 inches).  This degree of accuracy exceeds the requirements of the most stringent DOT certification requirements. Prior to delivering any CS8800 profiling system to an end user, SSI’s verifies that the collection system compares against an independent reference profile with an equal or greater degree of accuracy than is required by agency specifications or equipment certification requirements.

Figure 1:▲SSI CS8800 Profiling System Accuracy Results▲

Figure 2:▲SSI CS8800 Profiling System:  Proof of Accuracy vs. Survey Data▲

2. Proof of Repeatability  SSI’s CS8800 Walking Profiler system is proven to also generate highly repeatable profile data.  A repeatability comparison between the six same surface CS8800 runs is shown in Figure 3.  There is excellent point-to-point repeatability between the various individual collections, with a repeatability statistic of 99%

Figure 3:▲SSI CS8800 Profiling System:  Repeatability of Same Surface Collections▲

3. Cross-Correlation of CS8800 Data An increasingly popular method of comparing same surface data from profiling devices is to compute a cross-correlation score rating the agreement between the multiple profiles. The CS8800 has demonstrated the ability for very high cross-correlation scores. Waveband correlation between six same surface data collections is shown in the table below in Figure 4. For purposes of this analysis, the wavebands of interest are: (1) IRI waveband; (2) Long (25-125 feet); (3) Medium (5-25 feet); and (4) Short (1-5 feet). 

Figure 4:▲SSI CS8800 Profiling System:  Cross-Correlation of Same Surface Data▲

The waveband correlation is 99% or higher in all wavebands except the short waveband, which achieved an impressive 93%. 

4. Comparison of Same Surface Ride Statistics  Figure 5 shows the IRI (International Roughness Index) values for six same surface data collections with the CS8800. The IRI values are tightly clustered, with no run differing from another by more than 1.6 inches/mile on an SSI proving ground surface with a roughness content of about 215 inches per mile (3400 mm/km).

Figure 5:▲SSI CS8800 Profiling System:  Same Surface IRI Comparison▲

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Notes:

¹Runs 4-6 were collected one day later and with a separate CS8800 device than was used to collect Runs 1-3.

²Analyses generated using a maximum 5 inch (127 mm) shift profile offset shift and 200 foot (61 m) Moving Average High Pass Filter.

³The performance of the CS8800 and other surface profiling devices is affected by variables such as device tracking, operating speed and the magnitude of roughness and texture attributes on the test surface.

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