TimeServers - RAF Instruments

Measurements Provided: Precision Time Codes
- IRIG-B 123 Amplitude Modulated (AM)
- NTP; Network Time Protocol
- 1PPS; Pulse per Second; TTL
- 10Mhz output; sine wave
Manufacturer or Builder of the Instrument: Meinburg

Operational Status:
- permanent infrastructure
General Description:
- The timeservers all take a GPS antenna in and produce a number of timing signals.
  - Network Time Protocol (NTP). Across the ethernet.
  - IRIG-B AM. Separate physical line with distribution box.
  - Pulse per second (1-PPs). Separate physical line with distribution box.
  - 10Mhz pulse signal
  - Some models may have RS-232 or Ethernet output.
Measurement Characteristics:
- Overall estimate of uncertainty:
- Response time:
- Precision: IRIG-B is single digit micro seconds, NTP is single digit milliseconds.
- Other measurement characteristics (comments on signal/noise, bias limits, etc):

Description of Software, Data Handling, and Data Flow:
- Software Components (data acquisition, display, processing, and analysis): Timing signals are used primarily by data acquisition computers and instruments to provide accurate time tagging of data.
- Data Processing Chain (from flight to archival): none.
QA Procedures and Needs:

Lead Contacts

Documentation

Operating Manual: Can be found in subversion http://svn.eol.ucar.edu/svn/raf/ManufacturerManuals/TimeServers
Descriptive Publications

Internal users: See http://wiki.eol.ucar.edu/rafscience/TimeServers (last edited 2012-12-10)