7-5
IM 704420-01E
Outputting Signals, Initializing Setup Information, and Setting Key Lock
7
Setting the jitter ratio correction coefficient
This function corrects the measured jitter ratio using a linear equation. The jitter is the
value obtained by multiplying the corrected jitter ratio and the clock value (T). The
corrected jitter ratio is used for the numeric display, meter indication, and DC output.
Correction equation:
Corrected jitter ratio (%) = correction coefficient
α
×
measured jitter ratio (%) + correction coefficient
β
(%)
Jitter correction equation: Corrected jitter (ns) = correction coefficient
α
×
measured
jitter (ns) + correction coefficient
β
(%)
×
T*
*
T is the period of the clock signal of the CD or DVD. When the measurement function is 3T
jitter, T = 231.385/N (where N is the
×
N value). When the measurement function is D-to-C
jitter, T is the period of the clock signal that is applied to the clock input connector or
regenerated by the PLL circuit.
• Selectable Range
Correction coefficient
α
: 0.0001 to 9.9999
Correction coefficient
β
: –9.999 to 9.999%
• Resolution
Correction coefficient
α
: 0.0001
Correction coefficient
β
: 0.001%
Note
•
The upper limit must be greater than the lower limit when setting the jitter ratio output
range.
•
If the average value is shown when the average coefficient of the DC output filter is some
value other than the initial value (see section 7.4), the [AVE] measurement indicator
blinks.
•
When the average coefficient or the jitter ratio correction coefficient is some value other
than the initial value (see section 7.4), the [
σ
/T] (when displaying the jitter ratio) or [
σ
]
(when displaying the jitter) measurement indicator blinks.
•
The DC output is 5 V when the trigger is not activated for the input signal and
measurements cannot be made.
•
If the TA120E becomes unlocked (see section 4.7), the DC output is set to 5 V.
7.1 Setting the DC Output
