4-2
IM 704420-01E
Explanation
There are two measurement functions: 3T jitter and D-to-C jitter. You must specify the
conditions of the signal to be measured for each measurement function.
Selecting 3T jitter
The measurement range of 3T jitter is 2.5T to 3.5T (T = 231.385 ns/N, where N is the
×
N speed value). The following table shows the measurement range when N is 1, 2,
4, 8, and 10:
N
Measurement Range (Unit: ns)
1
578.462 to 809.847
2
289.231 to 404.923
4
144.615 to 202.461
8
72.307 to 101.230
10
57.846 to 80.984
*
Truncate values below the one-thousandths place.
•
×
1,
×
N
Select one of these values when measuring the pulse width of the 3T data signal of
a CD to determine the 3T jitter. [
×
1], and [
×
N] are used to measure the pulse width
of single-speed, and
×
N speed drives, respectively. For details on “N,” see
“Manual setting of
×
N speed” below.
• Manual setting of
×
N speed
Specify the
×
N speed value N when measuring the pulse width for speeds other
than [
×
1]. When the value can be specified, the [SET] indicator lights and the
×
N
speed value N is shown on the display.
• Range: 1.0 to 10.0
• Resolution: 0.1
• Selecting the polarity of the data signal
•
: Measures the positive side (from the rising slope to the next falling slope) of
the pulse width.
•
: Measures the negative side (from the falling slope to the next rising slope)
of the pulse width.
Selecting D-to-C jitter
The measurement range of D-to-C jitter is –5 ns to T + 5 ns (where T is the period of
the measured clock signal).
• DtoC DVD
Select this measurement function when measuring the time difference between the
data signal and the clock signal of a DVD to determine the D-to-C jitter.
• Selecting the slope of the data signal
•
: The rising slope becomes the measurement starting point of the time
difference.
•
: The falling slope becomes the measurement starting point of the time
difference.
• Both
and
: The rising and falling slopes alternately become
measurement starting points of the time difference.
4.1 Setting the Measurement Function
