Signal Output - YOKOGAWA TA220 User Manual

2.6

Signal Output

DC Output of the Jitter Ratio <<For procedures, see section 7.1>>
2-14
DC Output of the Jitter Ratio
The jitter ratio of the selected measurement function can be linearly converted to DC
voltage (0 to 5 V) and output from the jitter ratio DC output terminal on the rear panel.
You can also change the jitter ratio that corresponds to 0 V and 5 V.
Jitter Ratio Determination Output
You can specify the determination level in terms of a jitter ratio and output 5 VDC from
the jitter ratio DC output terminal when the data signal is less than or equal to the
determination level, and 0 VDC when it is greater than the determination level.
DC Output Filter
This filter takes the moving average of the measured jitter ratio. When the DC output
fluctuates due to instability in the measured jitter, this function suppresses the degree of
fluctuation. You can set the number of measured values (average coefficient) to be
averaged in the range from 1 to 10. The moving-averaged jitter ratio is shown on the
numerical display and analog meter, and sent to DC output.
When the average coefficient is set to 5
A
Measured
jitter ratio
Jitter ratio
after moving
average
Jitter Ratio Correction Coefficients
The specified jitter ratio can undergo 1st order correction per the specified correction
coefficients. Two correction coefficients can be specified, α (slope) and β (offset value).
The jitter is the value obtained by multiplying the corrected jitter ratio by time T (see
section 2.3). The corrected jitter and jitter ratio are shown on the numerical display and
analog meter, and sent to DC output.
Jitter Ratio Correction Equation
J = αJ + β
c m
J : corrected jitter ratio, J
c
D
G
F
B
E
C
c
b
a
: uncorrected jitter ratio
m
Time
Time
IM 704610-01E