Pendulum CNT-91R User Manual

Specifications
Measurement
Uncertainties
Random Uncertainties (1
)
■ Quantization Error (Eq)
Eq = 65 ps rms
(<50 ps rms typical)
■ Start/Stop Trigger Error (Ess)
Ejitt
er
= Single Period Jitter (rms) (s)
V
noise-input:
500 V
rms
internal noise
(<200 Vrms typical)
Vnoise-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.
Example for phase with sinewave signals and 0
V trigger levels (attenuator setting xl):
Etl = [0.001/Vpk(A) + 0.001/Vpk(B)]°, where
Vpk(A) = Inp A peak voltage in V, and
V
pk(B) = Inp B peak voltage in V.
■ 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
8-59.
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
8-55
USER MANUAL ● CNT 9x Series ● Rev.22 February 2020

Pendulum CNT-91R Specifications

General

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