Hioki 8847, Instruction Manual

Page: 55 / 372

3.4 Setting Measurement Configuration
45
3
Chapte
r 3
Measur
em
en
t Proced
ure
_______________________________________________________________
• The timebase and sampling rate can be set independently. The sampling rate
is selected depending on the timebase setting.
• When the following timebase values are selected, displayed waveforms are
compressed in the horizontal (time axis) direction as shown.
20 ms/div
→
x1/2
10 ms/div
→
x1/5
_______________________________________________________________
Common
To automatically set the time axis range
When you press the AUTO key, a suitable time range for the input sig-
nal is selected and measurement starts. (This applies only to the
Memory Function.)
See: "3.7 Measurement With Automatic Range Setting (Auto-Ranging Func-
tion)" (

p.58)
To minimize noise during measurement
If the sampling rate is set too fast, when the input waveform ampli-
tude is small, the difference between maximum and minimum values
may become quite large as a result of sudden impulses such as
noise. To prevent such phenomena, select a slower sampling rate or
enable the input module's lowpass filter (

p.52).
The data refresh rate is not allowed to exceed the maximum sampling rate of the
input module.
During the period when data are not updated, the same data are measured,
resulting in a stair-shaped waveform. Even when the same signal is sampled
simultaneously by two units, the data may differ due to differences in sampling
rate, frequency bandwidth, and frequency response.
Data refresh rate for various units
Module Max. time axis range Max. sampling setting See
8966 5
μ
s/div 50 ns (20 MS/s) -
8967 Dependent on data re-
fresh setting Dependent on data re-
fresh setting
See: "8.10.5"(

p.145)
8968 100
μ
s/div 1
μ
s (1 MS/s) -
8969 500
μ
s/div 5
μ
s (500 ks/s) -
8970 Dependent on setting Dependent on setting See: "8.10.5"(

p.145)
8971 100
μ
s/div 1
μ
s (1 MS/s) See: "8.10.6"(

p.148)
8972 Dependent on re-
sponse setting Dependent on re-
sponse setting
See: "8.10.7"(

p.149)
8973 5
μ
s/div 50 ns (20 MS/s) -