Quick Start Guide

Appendix 2 Overview of Settings and Functions
A2
Appendix 2 Overview of Settings and Functions
Instrument Settings
About the Screen
The instrument’s LCD provides SVGA (800 × 600) resolution. The wave-
form display area consists of 625 horizontal dots and 500 vertical dots.
The waveform display area is divided into 25 divisions horizontally, and
20 divisions vertically, with each division composed of 25 dots horizon-
tally and vertically.
Each data frame (one division) represents 100 samples horizontally,
and 80 to 1600 data bits vertically. (depending on the input module)
Each displayed data frame (one division) changes in accordance with
expansion and compression of the time and voltage axes.
25 div
20 div
1 div = 100 samples
Setting the Timebase (Horizontal Axis)
See "4.2.2 Setting the Timebase (Horizontal Axis) and Sampling Rate", "8.9 Magnifying and Compressing
Waveforms", and "Appendix 4.3 Measurement Frequency Limit" in the Instruction Manual
The input signal acquisition rate corresponds to time per division on the
horizontal axis.
Determining the timebase: Calculate from the frequency and period.
f [Hz] = 1/t [s] (f: frequency, t: period)
Example: If the measurement frequency is 50 Hz: 50 [Hz] = 1/t [s]
t = 1/50 [s] = 0.02 [s] = 20 [ms]
So to display five cycles on the screen (25 divisions horizontally), 20
[ms] × 5/25 [div] = 4 ms/div
Select 5 ms/div for the timebase, which is the closest available setting
to the calculated value.
To measure phenomena with relatively fast signals such as
instantaneous waveforms, we suggest setting a small value (if the
frequency is 50 Hz, the timebase should be set faster than 5 ms/div).
During and after measurement, waveforms can be expanded and
compressed along the time axis.
1 div
Timebase:
with 1 div = 5 ms
• To expand and compress: Change th
e
expansion and compression ratio. (⇒ p
.
62)
• To expand a specified section (Memor
y
function only): Use the Zoom function.
(
⇒ p. 62)
Timebase:
with 1 div = 10 ms
Timebase and Sampling
See "Appendix 4.1 Sampling" and "Appendix 4.4 Recorder Function Values" in the Instruction Manual
For the Memory Function (Sampling point recording):
The sampling period is 1/100
th
of the timebase. When the timebase is set to 100 µs/
div, the sampling period is 1 µs. Changing the timebase setting also changes the
sampling period accordingly.
For the Recorder Function (Envelope recording):
One data point is recorded every 1/100
th
of the timebase as two amplitude values:
the maximum and minimum values measured during the specified sampling period.
With the 10 ms/div timebase, one data point is recorded every 100 µs. When the
sampling period is set to 1 µs, 100 samples are provided in order to record each data
point. The values recorded for each data point are maximum and minimum values
among these 100 samples.
Maximum
Minimum
1 div
1 2.... ....100
Sampling Period
Sampling Points