Hioki MR8847-51, Руководство по измерениям

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13
Monitor abnormal occurrences
Pre-trigger
To record waveforms that exist before any abnormal occurrence, such as an
instantaneous power failure, set the pre-trigger, which sets where the trigger (trigger
point) is issued on the recording length of the waveform.
40%
Recording length
25 divisions
60%
T
E.g. To record the waveform with a length of 10 divisions that exist before an
instantaneous power failure for the recording length setting of 25 divisions, set
the pre-trigger to 40%. (Calculation method: 10 [div] / 25 [div] × 100%)
Refer to “What is a pre-trigger?” (p. 25).
3 Set automatic saving
Configure the setting on the system screen as follows.
Move the
cursor.
Select the items to be set.
Displays the system
screen.
(
[File Save]
sheet)
Auto Save
Set to [On] .
Save to
Specify the folder
the waveform to be
saved to.
For automatic saving, the built-in drive, a USB flash
memory, and a CF card are available.
When saving waveforms to the CF card, please check that there
is enough capacity and the card is properly inserted.
4 Start and Stop Measurement
Press
[Trigger waiting]
Trigger level
127.2 V
1/2 cycle
T
-127.2 V
[Trigger waiting] will be displayed
until the commercial power voltage
satisfies the trigger conditions (in
this case, until an instantaneous
power failure occurs).
When the trigger conditions are met, the trigger is issued and
measurement will start.
Measurement data will be recorded until the STOP key is
pressed.
Data will be saved automatically to the CF card and wait
the next instantaneous power failure after the measurement
completes.
Refer to “Analyze data” (p. 14) for analysis method.
10
9
8
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6
5
4
3
2
1
Appx.
Ind.
HIOKI MR8847G963-03