Pendulum CNT-91 - Page 175

Specifications
Frequency & Period
■ Random Uncertainty (rms)
Smart Mode
For measuring times <200 ms and if Smart
Freq = AUTO or OFF:
x Measurement Result [Hz or s]
For measuring times >=200 ms and if Smart
Freq = AUTO or ON:
x Measurement Result [Hz or s]
N = 800 /Measuring Time, however, 6 < N <
1000 and
N < (Freq/2) * Measuring Time - 2 & N <
Measuring Time / 8  s
Normal Mode
x Measurement Result [Hz or s]
■ Systematic Uncertainty
Both Modes
Hz or s]
where:
MR = Meas. Result (Freq or Per)
MT = Meas. Time
Frequency Ratio f
1
/f
2
■ Typical Random Uncertainty (rms)
NOTE. Frequency Ratio is an auxiliary mea-
surement function, intended to give an in
dica-
tion, with no guaranteed specification.
[dimensionless, e.g. ppm]
Phase
■ Typical Random Uncertainty (rms)
NOTE. Phase is an auxiliary measurement
function, intended to give an indication, with no
guaranteed specification.
■ Systematic Uncertainty
Duty Factor
■ Random Uncertainty (rms)
or minimum: 1 ppm
■ Systematic Uncertainty
[dimensionless, e.g. ppm]
8-56
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020