2-4
IM 704510-01E
2.3
Sampling Mode
Sampling Mode (See section 5.1 for the operating procedure)
There are three sampling modes: time stamp mode, hardware histogram mode, and
inter-symbol interference analysis mode. The sampling method (data acquisition
method), the display format after measurements, and methods of analysis and
calculation vary depending on the sampling mode. For details on the display format, see
section 2.6 “Displaying the Measured/Calculated Results.”
·
Time Stamp Mode (TS)
In this mode, the elapsed times of measurement (time stamp*) and measured values
are stored in the acquisition memory. Based on the acquired data, the measured and
computed results can be displayed in four formats: histogram, list (time stamps and
measured values), time variation, and statistics. The maximum number of data points
that can be acquired in the memory (maximum sample size) is 1,024,000 (512,000
when using dual measurement function), and the maximum sampling time is 320 s.
*
Time stamp refers to the time elapsed from the time arming (see page2-9) is activated to the
time the measurement of a sample is completed.
·
Hardware Histogram Mode (HH)
The measured values and the frequencies of occurrence of those values are acquired
in the acquisition memory. Based on the acquired data, the measured and computed
results can be displayed in three formats: histogram, list (measured values and
frequency), and statistics. The maximum sample size is 10
9
, and the maximum
sampling time is 3200 s.
·
Inter-symbol Interference Analysis Mode (ISI)
As with the time stamp mode, the time stamps and measured values are stored in the
acquisition memory. Based on the acquired data, the data before and after the
specified space or mark is extracted, and the measured and computed results are
displayed in either of two formats: histogram and statistics or list (time stamps and
measured values). The maximum sampling size and maximum sampling time are the
same as those for the time stamp mode.
3T
Space
Mark
Mark
3T 3T
3T
6T
11T
11T
14T
7T
Space
Space
Space
Mark
Mark
Mark
Analyze the Mark data immediately before the Space(3T)
Analyze the applicable Mark data.
Trigger
Trigger
Trigger
Comparison of the Main Functions
TS
HH
ISI
Histogram display
Yes
Yes
Yes (statistics are also displayed at the bottom)
List display
Yes
Yes
Yes (time variation is also displayed at the right)
Time variation display
Yes
No
No
Statistics display
Yes
Yes
No
Measurement function
All*
All*
3 types**
*
7 types: period, A-to-B time interval, pulse width, period A & period B, period A & A-to-B time
interval, pulse width A & A-to-B time interval, pulse width A & pulse width B
** Pulse width, pulse width A
→
A-to-B time interval, pulse width A
→
pulse width B
