Analog I/O Functionality
Resolution & Aliasing
Analog to Digital
Digital to Analog
Digital I/O Functionality
Digital Inputs
Digital outputs
Pulse I/O
Analog Signal Transmission
Analog Signal Types
Noise & Grounding
Wire & Cable Options
Digital Signal Transmission
The OSI Network Model
Physical Layer Options
Network Topologies
Fieldbus & Device Networks
Data Aquisition Hardware
Selecting a System
Standalone Components
Communication Devices
Presentation & Analysis
Development Considerations
Component Architectures
Off-the-Shelf Offerings
Recording, Printing, and Storage
Definitions and Classifications
Trend Recorders
Data Loggers
Videographic Recorders
Information Resources
List of Figures
Acronyms at a Glance
Data Tables
Transactions Home

Videographic Recorders
Evidence of the many benefits of videographic, or paperless, recorders are the large number of suppliers that now offer these types of instruments. Some are relative newcomers to the recorder field, utilizing their expertise in electronic technology to meet user needs. One example is the recent offering of a circular chart videographic recorder with a 10-inch screen display-equivalent in size to the common paper chart versions.
  Display technology has been getting better and better in sharpness of detail, with a wide range of bright colors, similar to the proven quality of a newer PC. Some models offer the flexibility of plotting records horizontally or vertically. A common screen size on such recorders is small-on the order of 76 mm wide by 38 mm high (3 in. x 1.5 in.).

Magnetic storage media, on PCMCIA card or floppy disk, allow
videographic recorders to download data for archival storage.

  Some suppliers offer a 5-inch wide display area or larger. Most are designed for panel mounting and come in a size as small as 1/4 DIN. In addition to displaying trend records or bar graphs, the instruments can be configured at will to provide large digital displays of the measurements in engineering units or small digital readings along with the trend curves.
  These recorders have some form of storage media-either a 3-1/2 inch floppy disk or a PCMCIA card-which continuously stores all the measurement inputs as well as the recorder configuration. From such stored data, an operator can use a touchscreen or membrane keypad to provide such display functions as: a split screen (two trend windows), zooming, faceplate displays, alarm summaries, and selected trends (such as six out of up to 24 inputs).
  The recorder's disk or card can be removed and used to download all its accumulated data to a PC that has the necessary software. An engineer can bring up any of the stored data for review and analysis, zooming in on a desired time, say, of a process upset (as well as just before and just after the event).
  Videographic recorders may include a serial port that permits data to be sent, for example, over an RS-422/485 communication network directly to a PC or DCS with suitable software. This can be two-way communication. Thus, an operator at a PC in a control room could monitor the recorder readings in real-time, call for specific data, and even reconfigure the recorder.

  References and Further Reading
  The Data Acquisition Systems Handbook, Omega Press LLC, 1997.
  New Horizons in Data Acquisition and Computer Interfaces, Omega Press LLC, 1997.
  Omega® Universal Guide to Data Acquisition and Computer Interfaces, Omega Press LLC, 1997.
  "Boards, Recorders, and Software Ease Data Acquisition, Temperature Recording Tasks," Peter Cleaveland, I&CS, August, 1997.
  Dictionary of Measurement and Control: Guidelines for Quality, Safety, and Productivity, 3rd ed., ISA, 1995.
  "DSO-Digital Storage Oscilloscopes," T. Lecklider, et al, Measurements & Control, October, 1996.
  Encyclopedia of Instrumentation and Control, Douglas M.Considine, McGraw-Hill, 1971.
  Instrument Engineers' Handbook, Third Edition, Bela G. Liptak, Chilton, 1995.
  Instrumentation Catalogue, Measurement and Automation, National Instruments, 1998.
  "Melding Markets Via Evolution," M.P. Minneman and W. H. Manning, InTech, February, 1997.
  "Monitoring and Data Collection Improved by Videographic Recorder," Water Engineering & Management, November, 1995.
  "New Breed of Industrial Process Recorder," Collen Baker, Measurements & Control, September, 1996.
  "Oscilloscopes-DSO Versus Analog," Richard Parish, Measurements & Control, September, 1997.
  "Paperless Recorders Meet Expanding Information Needs," Greg Kleinert, I&CS, March 1995.
  "Paperless: The Trend in Recording," John Ham, InTech, June 1996.
  "Portable Multifunction Paperless Data Loggers," Ed Palko, Plant Engineering, September, 1995.
  "Power Analysis with a DSO," Kevin J. Cassidy, Measurements & Control, October, 1997.
  Process/Industrial Instruments and Controls Handbook, Fourth ed., Douglas M. Considine, McGraw-Hill, 1993.
  "Process Recorders Keep Getting More Flexible and Capable," Control Engineering, September, 1996.
  "Recent DSO Developments," Charles Holtom. Measurements & Control, October, 1996.
  "Regulators Embrace Paperless Recorders," Phil Shook, Control, April 1995.
  "Smarter, Faster, Data Logging Systems," Steve Lekas, Sensors, October, 1997.
  "Videographic Recorders," Brian Mattox and Patrick Bridge, Measurements & Control, September, 1997.
  "X-Y Recorders," Measurements & Control, October, 1997.

Top of Page  Next Chapter: Information Resources