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Hong Kong, China, SCL (Standards and Calibration Laboratory)
Complete CMCs in Time and Frequency for Hong Kong, China (.PDF file)
Time scale difference. Local clock vs UTC, 1E-09 s to 1 s
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 1
Direct time interval measurement against UTC(SCL) using calibrated counter
1 PPS amplitude: 1 V to 5 V (50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/1
 
Time interval. Time difference source, 1E-09 s to 1 s
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 1
Direct time interval measurement using calibrated counter
Trigger level: -4 V to +4 V (50 ohm)
Slew rate: > 1E+09 V/s
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/21
 
Time interval. Time difference source, 1 s to 999 s
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 1 to 3
Direct time interval measurement using calibrated counter
Trigger level: -4 V to +4 V (50 ohm)
Slew rate: > 1E+09 V/s
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/22
 
Time interval. Time difference meter, 1E-09 s to 1 s
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 1
Measuring test signals from calibrated generator
Trigger level: -2 V to +2 V (50 ohm)
Slew rate: > 1E+09 V/s
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/28
 
Time interval. Time difference meter, 1 s to 999 s
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ns: 1 to 15
Measuring test signals from calibrated generator
Trigger level: -2 V to +2 V (50 ohm)
Slew rate: > 1E+09 V/s
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/29
 
Frequency. Local frequency standard, 10 MHz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 8.0E-14
Phase comparison with laboratory frequency standard
Measurement time: 5 d to 10 d
Amplitude: 0.5 V to 3 V (rms into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/2
 
Frequency. Local frequency standard, 5 MHz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 8.0E-14
Phase comparison with laboratory frequency standard
Measurement time: 5 d to 10 d
Amplitude: 0.5 V to 3 V (rms into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/3
 
Frequency. Local frequency standard, 1 MHz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 8.2E-14
Phase comparison with laboratory frequency standard
Measurement time: 5 d to 10 d
Amplitude: 0.5 V to 3 V (rms into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/4
 
Frequency. Local frequency standard, 100 kHz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 2.0E-13
Phase comparison with laboratory frequency standard
Measurement time: 5 d to 10 d
Amplitude: 0.5 V to 3 V (rms into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/5
 
Frequency. General frequency source, 1 Hz to 1E+03 Hz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 4.0E-06 to 3.0E-09
Direct frequency measurement using calibrated frequency counter
Gate time: 120 s to 1000 s
Number of measurements: 5 to 10
Amplitude: 0.3 V to 2.5 V (peak-to-peak into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/6
 
Frequency. General frequency source, 1 kHz to 1E+03 kHz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 3.0E-09 to 5.0E-11
Direct frequency measurement using calibrated frequency counter
Gate time: 120 s to 1000 s
Number of measurements: 5 to 10
Amplitude: 0.3 V to 2.5 V (peak-to-peak into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/7
 
Frequency. General frequency source, 1 MHz to 1.3E+03 MHz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 5.0E-11
Direct frequency measurement using calibrated frequency counter
Gate time: 120 s to 1000 s
Number of measurements: 5 to 10
Amplitude: 0.3 V to 2.5 V (peak-to-peak into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/8
 
Frequency. General frequency source, 1.3 GHz to 10 GHz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 6.0E-10 to 2.0E-10
Direct frequency measurement using calibrated frequency counter
Gate time: 1 s
Number of measurements: 5 to 10
Amplitude: 0.01 mW to 3 mW (power into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/9
 
Frequency. General frequency source, 10 GHz to 26.5 GHz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 2.0E-10 to 1.0E-10
Direct frequency measurement using calibrated frequency counter
Gate time: 1 s
Number of measurements: 5 to 10
Amplitude: 0.01 mW to 3 mW (power into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/10
 
Frequency. Frequency counter, 1 Hz to 1E+03 Hz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 4.0E-06 to 3.0E-09
Measuring test signals from calibrated frequency source
Gate time: 120 s to 1000 s
Number of measurements: 5 to 10
Amplitude: 0.3 V to 2.5 V (peak-to-peak into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/11
 
Frequency. Frequency counter, 1 kHz to 1E+03 kHz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 3.0E-09 to 6.1E-11
Measuring test signals from calibrated frequency source
Gate time: 120 s to 1000 s
Number of measurements: 5 to 10
Amplitude: 0.3 V to 2.5 V (peak-to-peak into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/12
 
Frequency. Frequency counter, 1 MHz to 1.3E+03 MHz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 6.1E-11
Measuring test signals from calibrated frequency source
Gate time: 120 s to 1000 s
Number of measurements: 5 to 10
Amplitude: 0.3 V to 2.5 V (peak-to-peak into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/13
 
Frequency. Frequency counter, 1.3 GHz to 10 GHz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 6.1E-10 to 2.0E-10
Measuring test signals from calibrated frequency source
Gate time: 1 s
Number of measurements: 5 to 10
Amplitude: 0.01 mW to 3 mW (power into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/14
 
Frequency. Frequency counter, 10 GHz to 26.5 GHz
Relative expanded uncertainty (k = 2, level of confidence 95 %): 2.0E-10 to 1.0E-10
Measuring test signals from calibrated frequency source
Gate time: 1 s
Number of measurements: 5 to 10
Amplitude: 0.01 mW to 3 mW (power into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/15
 
Time interval. Period source, 1 ms to 1E+03 ms
Relative expanded uncertainty (k = 2, level of confidence 95 %): 3.0E-09 to 4.0E-06
Derived from direct frequency measurement using calibrated counter
Gate time: 120 s to 1000 s
Number of measurements: 5 to 10
Amplitude: 0.3 V to 2.5 V (peak-to-peak into 50 ohm)
Ideal DUT effect included
Approved on 31 August 2005
Internal NMI service identifier: SCL/16