User Manual

4.2 Setting Measurement Configuration (Status Settings Screen)
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Chapter 4 Measurement Configuration Settings
About timebase and sampling setting
The timebase setting establishes the rate of input signal waveform acquisition,
specified as time-per-division on the horizontal axis (time/div).
The sampling setting specifies the interval from one sample to the next. For
details about sampling, refer to "Appendix 4.1 Sampling" (⇒ p. A49).
Memory Function case:
• The timebase and sampling rate settings are interdependent. Changing the
timebase causes the sampling rate to be changed. The number of samples
per division is fixed at 100. Therefore, the sampling period is 1/100
th
of the
timebase setting.
• If the appropriate timebase setting for the input signal is unknown:
Set the timebase automatically.
See"3.3.5 Automatic Range Setting (Auto-Ranging Function)" (⇒ p. 73)
• To acquire waveforms with different sampling rates for each channel:
Set different sampling rates for Timebase 1 and Timebase 2. Set Timebase 2
to the slower sampling rate.
See"Setting Different Sampling Rates" (⇒ p. 92)
• Using the Model 8958 16-Ch Scanner Unit:
If other input modules are installed together with the Model 8958, the other
modules are set to Timebase 1, and the 8958 to Timebase 2.
See"Setting Timebase 1 and 2: When using the Model 8958 16-Ch Scanner Unit
together with other input modules" (
⇒ p. 94)
If only the Model 8958 is installed, it is set to Timebase 1.
See"Setting Channels to Use: When using only the Model 8958 16-Ch Scanner Unit"
(
⇒ p. 88)
• Setting the sampling period according to an external signal:
(External Sampling)
See"14.2.3 External Sampling (EXT.SMPL)" (⇒ p. 394)
Recorder Function case:
The timebase and sampling rate can be set independently.
The sampling rate (from 100 ns/S to 1 s/S) is selected depending on the time-
base setting.
See "Appendix 4.4 Recorder Function Values" (⇒ p. A51)
Real-Time Saving Function case:
• The timebase and sampling rate settings are interdependent. Changing the
timebase causes the sampling rate to be changed. The number of samples
per division is fixed at 100. Therefore, the sampling period is 1/100
th
of the
timebase setting.
• The timebase for the whole waveform can be set automatically. This selects
the most suitable timebase according to the measurement waveform time-
base set for real-time data and the selected save destination.
When set manually, the timebase can be selected from 10 ms/div to 1 hour/
div.
See"9.3 Pre-Measurement Settings" (⇒ p. 232)
4.2.2 Setting the Timebase (Horizontal Axis) and Sam-
pling Rate