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 Germany, PTB (PhysikalischTechnische Bundesanstalt)    Complete CMCs in Time and Frequency for Germany (.PDF file)
  
Time scale difference. Local clock vs UTC(PTB), 1 s to 1 s   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 2   Time interval measurement   Pulse amplitude: > 1 V   Fractional part of modulo 1 second difference, integer part can be provided also. Approved on 21 April 2005   Internal NMI service identifier: PTB/1 
 Time scale difference. Local clock vs UTCs, 1 s to 1 s   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 40   Time interval measurement   Pulse amplitude: > 1 V   Prediction time: 20 days   Fractional part of modulo 1 second difference, integer part can be provided also. Comparison against predicted UTC. Approved on 21 April 2005   Internal NMI service identifier: PTB/2 
 Time scale difference. Local clock vs UTC, 1 s to 1 s   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 5   Time interval measurement, post processed   Pulse amplitude: > 1 V   Fractional part of modulo 1 second difference, integer part can be provided also. Approved on 21 April 2005   Internal NMI service identifier: PTB/3 
 Time scale difference. Remote clock vs UTC(PTB), 1 s to 1 s   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 10   GPS single channel common view   Averaging time: 1 day   Fractional part of modulo 1 second difference, integer part can be provided also. Approved on 21 April 2005   Internal NMI service identifier: PTB/4 
 Time scale difference. Remote clock vs UTC, 1 s to 1 s   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 42   GPS single channel common view   Averaging time: 1 day   Prediction time: 20 days   Fractional part of modulo 1 second difference, integer part can be provided also. Comparison against predicted UTC. Approved on 21 April 2005   Internal NMI service identifier: PTB/5 
 Time scale difference. Remote clock vs UTC, 1 s to 1 s   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 10   GPS single channel common view measurement, post processed   Averaging time: 1 day   Fractional part of modulo 1 second difference, integer part can be provided also. Approved on 21 April 2005   Internal NMI service identifier: PTB/6 
 Frequency. General frequency source, 0.5 GHz to 26.5 GHz   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in Hz: 2   Direct frequency measurement   Averaging time: > 1 h   Approved on 21 April 2005   Internal NMI service identifier: PTB/20 
 Time interval. Period source, 1E08 s to 1 s   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ps: 200   Time interval counter   Slewing rate: 0.5 V/ns   Uncertainty based on counter specifications. Approved on 21 April 2005   Internal NMI service identifier: PTB/21 
 Time interval. Time difference source, 1E08 s to 1 s   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 2   Double channel time interval counter   Slewing rate: 0.5 V/ns   Uncertainty based on counter specifications; double channel. Approved on 21 April 2005   Internal NMI service identifier: PTB/22 
 Time interval. Pulse width source, 1E08 s to 1 s   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ps: 200   Single channel time interval counter   Slewing rate: 0.5 V/ns   Uncertainty based on counter specifications. Approved on 21 April 2005   Internal NMI service identifier: PTB/23 
 Time interval. Time difference meter, 1E08 s to 1 s   Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 2   Time interval measurement   Slewing rate: 0.5 V/ns   Signals supplied locally. Approved on 21 April 2005   Internal NMI service identifier: PTB/24 
 Frequency. Local frequency standard, 5 MHz   Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 3.5E14   Phase time measurement   Averaging time: 1 day   Approved on 21 April 2005   Internal NMI service identifier: PTB/7 
 Frequency. Local frequency standard, 5 MHz   Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 3E13   Phase time measurement   Averaging time: 1000 s   Approved on 21 April 2005   Internal NMI service identifier: PTB/8 
 Frequency. Local frequency standard, 10 MHz   Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 3.5E14   Phase time measurement   Averaging time: 1 day   Approved on 21 April 2005   Internal NMI service identifier: PTB/9 
 Frequency. Local frequency standard, 10 MHz   Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 3E13   Phase time measurement   Averaging time: 1000 s   Approved on 21 April 2005   Internal NMI service identifier: PTB/10 
 Frequency. Local frequency standard, 5 MHz   Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 4E13   Frequency difference multiplication   Averaging time: 1 s   Relative frequency difference: < 1E11   Frequency instability measurement. Approved on 21 April 2005   Internal NMI service identifier: PTB/11 
 Frequency. Local frequency standard, 100 MHz   Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 4E13   Frequency difference multiplication   Averaging time: 1 s   Relative frequency difference: < 1E11   Frequency instability measurement. Approved on 21 April 2005   Internal NMI service identifier: PTB/12 
 Frequency. Local frequency standard, 5 MHz   Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 1E14   Frequency difference multiplication   Averaging time: 100 s   Relative frequency difference: < 1E11   Frequency instability measurement. Approved on 21 April 2005   Internal NMI service identifier: PTB/13 
 Frequency. Local frequency standard, 100 MHz   Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 1E14   Frequency difference multiplication   Averaging time: 100 s   Relative frequency difference: < 1E11   Frequency instability measurement. Approved on 21 April 2005   Internal NMI service identifier: PTB/14 
 Frequency. Local frequency standard, 5 MHz   Relative expanded uncertainty (k = 2, level of confidence 95 %) in Hz/Hz: 4E15   Frequency difference multiplication   Averaging time: 10000 s   Relative frequency difference: < 1E11   Frequency instability measurement. Approved on 21 April 2005   Internal NMI service identifier: PTB/15 
