Pendulum CNT-91R User Manual

Specifications
Measurement
Uncertainties
Random Uncertainties (1
)
■ Quantization Error (Eq)
Eq = 100 ps rms
■ Start/Stop Trigger Error (Ess)
Ejitter = Single Period Jitter (rms) (s)
V
noise-input:
500 uV
rms
internal noise (200
uV
rms
typical)
V
noise-signal:
The rms noise of the applied
signal
Systematic Uncertainties
■ Trigger Level Timing Error (E
t
l)
Time Interval, Rise/Fall Time, Pulse Width,
Duty Factor, Phase (attenuator setting xl)
where:
Sx = Slew rate at start trigger point (V/s) Sy =
Slew rate at stop trigger point (V/s) TLU =
Trigger level uncertainty (V) Hyst =
Hysteresis window (V)
Hyst = 30 mV ± 1% of trig lvl (DC to 1 kHz)
for Pulse Width & Duty Factor
Hyst = 6 mV ± 1 % of trig lvl (DC to l kHz)
for other measurement functions.
■ Timebase Error (TBE)
TBE is the relative error of the timebase oscil-
lator (dimensionless) and depends on the actual
oscillator used. See Timebase Options on page
8-15.
Total Uncertainty (2)
The general formula for all measurement
functions is:
Time Interval, Pulse Width,
Rise/Fall Time
■ Random Uncertainty (rms)
■ Systematic Uncertainty
where:
Etl = trigger level timing error
500 ps = maximum channel difference
TBE = timebase error
TIME = measurement result
Frequency & Period
■ Random Uncertainty (rms)
For measuring times <200 ms and if Smart
Freq = AUTO or OFF:
x Measurement Result [Hz or s]
8-11
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020

Pendulum CNT-91R Specifications

General

Brand	Pendulum
Model	CNT-91R
Category	Measuring Instruments
Language	English