Hioki MR8847A User manual

Read rst.
Offers an introduction to the Memory
HiCorder's basic measuring method
for rst time users.
MR8847A
MR8847-51
MR8847-52
MR8847-53 Measurement Guide
MEMORY HiCORDER
EN
Apr. 2021 Revised edition 3
MR8847G963-03 21-04H
HIOKI MR8847G963-03

HIOKI MR8847G963-03

1
Introduction
Introduction
Thank you for purchasing the Hioki MR8847A Memory HiCorder (MR8847-51, MR8847-52,
MR8847-53).
This Measurement Guide consists of several basic application examples. Before using the
instrument, be sure to read the Instruction Manual carefully.
The following documents are provided with this instrument. Refer to them as appropriate for your
application.
Instruction manuals Description
1 Measurement Guide
(This document)
Read rst.
O󰀨ers an introduction to the instrument’s basic measuring method
for rst time users.
2 Instruction Manual
(book)
Contains explanations and instructions regarding the instrument’s
operating methods and functions.
3 Communication
Command Instruction
Manual (PDF le)
Contains lists of the communication commands to control the
instrument with a computer and explanations regarding the
commands.
4 U8793, MR8790, MR8791
Instruction Manual
(PDF le)
Contains explanations and instructions regarding the operating
method as well as functions of the following models: U8793 Arbitrary
Waveform Generator Unit, MR8790 Waveform Generator Unit,
MR8791 Pulse Generator Unit, and SF8000 Waveform Maker
Contents
Screen structure and operation
overview
The screen structure and overview of the operation keys of
the instrument
(p. 2)
Preparations for Measurement The things to be done before carrying out measurement (p. 5)
Measurement Procedure The procedure from pre-measurement check to analysis,
saving, and printing.
(p. 7)
Measure the commercial power
supply
How to record waveforms of a 200-V commercial power
supply
How to save the data.
(p. 9)
Monitor abnormal occurrences How to record a voltage drop including power failure as an
example of special occurrences
How to record only abnormal occurrences, constantly
monitoring waveforms using the trigger function
How to save the data automatically
(p. 12)
Analyze the data How to observe waveform measured values and calculate
them using the A and B cursors
How to prevent the measured waveforms displayed on the
screen from being overlapped
(p. 14)
Print the data The printing method. (p. 21)
Convenient functions The auto-range function, pre-trigger, probe compensation (p. 24)
Others The screen, time axis and sampling, record length setting,
voltage axis and resolution, le transfer speed
(p. 27)
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Screen structure and operation overview
Screen structure and operation overview
Screen structure
For screens with sheet tabs displayed, the sheets can be switched every time a key is pressed.
Waveform screen File screen
The screen to observe waveforms The screen to view data les in a storage media
(CF card, built-in drive, USB ash memory,
internal memory).
Settings window Status screen
Displayable on the waveform screen.
Channel settings
window
Trigger settings
window
Sheet tabs
Displays selectable sheet
names.
The screen to set measuring methods and
waveform calculations
The window to set
details for analog or
logic channels
The window to set
details for triggers
System screen Channel screen
The screen to set environment, le saving,
printing, and communication, as well as initialize
data
The screen to set the each channel, scaling, and
comment
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Screen structure and operation overview
Operating Keys
1
2
3
6
4
5
9
10
11
13
14
15
16
12
87 1DISP key
Displays the waveform
screen.
8STATUS key
Displays the status screen.
2CH.SET key
Displays the channel
settings window in the
waveform screen.
9CHAN key
Displays the channel
screen.
3TRIG.SET key
Displays the trigger settings
window in the waveform
screen.
10 FILE key
Displays the le screen.
4Fkey
Select items to be set.
11 AB CSR key
(Lit in red while selected)
Displays the A/B cursor
settings window.
5ESC key
Cancels the running
operation.
Closes the displayed dialog
and the window.
KEY LOCK:
Press and hold ESC key
for 3 s to disable key
operations.
Press and hold it for 3 s
enable key operations.
12 WAVE key
(Lit in red while selected)
Assigns the waveform
scrolling to the jog and
shuttle knobs.
13 Inner: Jog
Outer: Shuttle
Scrolls through waveforms.
6STOP key
Stops the running
measurement.
1 press:
Measurement stops after
the set recording length.
2 presses:
It stops immediately.
14 CURSOR keys
Moves the cursor displayed
on the screen.
15 Manual trigger key
Issues a manual trigger
event.
7SYSTEM key
Displays the system
screen.
16 START key
Starts a measurement.
(Lit in green during
measurement operations)
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Screen structure and operation overview
17 18 19 20 21 22 23
17 PRINT key
Prints waveforms and others.
21 HELP key
Opens the help information.
18 COPY key
Prints a screen shot.
22 AUTO key
Starts auto-range measurement.
19 FEED key
Feeds the recording paper.
23 TIME/DIV key
Congures the time axis setting.
20 SAVE key (Lit in blue while accessing a recording medium)
Saves data (a dialog can be switched between visible and invisible during an auto-saving).
To change the setting content
Setting cursor
The current cursor position is
indicated by ashing.
1
Move the setting cursor to an item to be set.
2
Select an option
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Preparations for Measurement
Preparations for Measurement
Before using the instrument, refer to “Operating Precautions” in the Instruction Manual.
Install the instrument
To prevent overheating, be sure to leave the specied clearances around the instrument.
All around
the instrument,
at least 5 cm
Left side
Vent holes
Set the items necessary to the instrument
1
Connect the probes and
cords. 1
2
4
2
3
Refer to the Instruction
Manual for details.
Right side
Front
Left side
2
Insert the USB ash
memory or CF card.
3
Set the recording paper.
4
Connect the power cord.
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Preparations for Measurement
Turn on the instrument
Right side
Power On( )
Set the clock
Set the clock on the [Init] sheet. The date and time indication is shown at
the upper right of the screen.
Execute the zero-adjustment
This procedure compensates for input module di󰀨erences and sets the reference potential of the
instrument to 0 V.
To ensure precise measurements, perform zero-adjustment after 30-minute warm-up.
1
2
Congure the setting on the [Unit List] sheet.
1
Move the cursor to this position.
2
Select [Exec Zero-Adjust].
Tip
[Exec Zero-Adjust] can also be selected on the channel settings window ([Analog] sheet).
(On the waveform screen, press the DISP key, and then, on the channel settings window, press the
CH.SET key)
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Measurement Procedure
Measurement Procedure
Before perform measurement, please read “Operating Precautions” in the Instruction Manual.
Inspect the instrument before measurement
Please read “Pre-Measurement Inspection” in the Instruction Manual.
Connect the leads or clamp sensor to the measurement point
Set the measurement conditions
Congure the setting on the
waveform screen.
• Measurement function
• Timebase (horizontal axis)
• Recording length
On the Channel settings window of
the [Analog] sheet, congure the
settings.
• Voltage (vertical) axis range
Congure other settings if necessary.
Start and stop the measurement
Start the measurement Stop the measurement
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Measurement Procedure
Analyze, save, and print the data
Analysis
Scroll through the waveforms to observe them.
The displayed waveforms can be changed.
(It can be stretched or compressed.)
Save
Save the data.
The data can be also automatically saved under
the pre-congured saving conditions.
Observe the saved data.
The data can be loaded, and les can be deleted
and copied.
Print
<Example of print>
Print the recorded waveforms.
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Measure the commercial power supply
Measure the commercial power supply
The following explains the method of recording a voltage waveform for
the commercial power supply of 200 V AC (50 Hz /60 Hz), including the
method of saving the data after measurement. For one instance, the level
trigger is used to measure waveforms.
To measure repetitive waveforms such as the commercial power supply,
setting the standard level trigger level as the measurement start point will
make it easier to observe the waveforms.
T
Trigger
level
0 V
1 Prepare for measurement
Required items:
MR8847A Memory HiCorder
8966 Analog Unit
L9198 Connection Cord
CF card
Refer to “Preparations for
Measurement” (p. 5)
Insert the CF card. Connect the lead to the
measuring point.
Connect the power cord
to the power outlet.
Connect the lead to CH1.
2 Set the measurement conditions and trigger conditions
Congure the settings on the waveform screen described as follows.
Displays the
waveform screen.
Displays the channel
settings window.
([Analog] sheet)
Displays the trigger
settings window.
([Analog Trig] sheet)
Moves the
cursor.
Selects the items to be set.
1
2
3
1
2
Set the measurement conditions.
Voltage axis range
Set the voltage per one division on
the vertical axis.
Timebase
Set the time per 1 division on
the horizontal axis.
3
Set the trigger conditions.
Trigger type
Set to [Level].
Level
Set to [0 V].
Slope
Set to [↑].
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Measure the commercial power supply
Deciding on the horizontal axis (time axis) range
The horizontal axis (time axis) range is calculated from the frequency and cycle.
f [Hz] = 1/t [s] (f: frequency; t: cycle)
Example: When the measurement frequency is 50 Hz.
1 cycle is t = 1/50 [s], i.e. 20 ms.
When the horizontal axis (time axis) is set to 20 ms/div, exactly 1 cycle will be displayed in 1 division (1
square).
Vertical axis (Voltage axis) range
If you change the range during a measurement, the measurement will restart.
3 Set the saving conditions
Congure the settings on the system screen described as follows.
Move the
cursor.
Select the items to be set.
Displays the [File
Save] sheet on the
system screen.
Set the saving conditions
Select at save (Selection Save)
[No] Pressing the SAVE key allows saving measured data
under the congured saving conditions immediately.
[Yes] Pressing the SAVE key each time allows saving
measured data after the operator checks and
congures the saving conditions.
For example, the saving conditions listed below will be displayed on
the screen as shown above.
Save Type: Wave Binary Save to: CF Card
Save Name: Voltage Save Area: Whole Wave
Tip
To observe waveforms on the instrument, set the [Save Type] to [Wave Binary]. To observe
them on a computer, set it to [Text]. Data saved in the text format cannot be observed on the
instrument.
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Measure the commercial power supply
4 From Starting Measurement to Stop It
Press
[Trigger Wait]
T
Trigger
level
0 V
Trigger slop[↑]
When the trigger conditions are met, the trigger is issued and
the waveforms with a length equivalent to the preset record
length will be recorded. Measurement data will be recorded until
the STOP key is pressed.
5 Save the data
Press SAVE key.
Data will be saved under the pre-set saving conditions.
Tip Press FILE key to observe the saved data on the le screen. Refer to “Access the storage
medium” (p. 19).
Refer to”Analyze data” (p. 14) for the analyzing method.
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Monitor abnormal occurrences
Monitor abnormal occurrences
The following explains the recording method to record a voltage drop
including a voltage interruption.
Keep monitoring and save the measurement data automatically.
In this section, a voltage dip trigger is used to measure waveforms. The
following explains how to issue the trigger when an input signal from a
50-Hz commercial power falls from approximately 200 V rms (282.8 V
peak) to below 180 V rms (254.4 V peak).
Trigger level
1/2 cycle
T
1 Prepare for measurement
Required items:
MR8847A Memory HiCorder
8966 Analog Unit
L9198 Connection Cord
CF card
Refer to “Preparations for
Measurement” (p. 5)
Insert the CF card. Connect the lead to the
measuring point.
Connect the power cord
to the power outlet.
Connect the lead to CH1.
2 Set the measurement conditions and trigger conditions
Congure the setting on the waveform screen as follows.
Displays the
waveform screen.
Displays the Channel
settings window.
([Analog] sheet)
Displays the Trigger
settings window. ([Analog
Trig] sheet)
Move the
cursor.
Select the items to be set.
1
2
3
1
2
Set the measurement conditions.
Voltage axis range
Set the voltage per one division
on the vertical axis.
Timebase
Set the time per 1 division on
the horizontal axis.
3
Set the trigger conditions.
Trigger type
Set to [Drop].
Level
Set to [254.4 V].
Frequency
Set the frequency
Trigger
Set to [Repeat].
Pre-trigger
Set the ratio in %.
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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
Congure 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 ash
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
satises 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.
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Analyze data
Analyze data
Observe the measured waveform
Scroll through the waveform
The position of the waveform currently displayed on the display is indicated on the scroll bar.
Red bar
(Whole waveform)
Blue frame
(Currently displayed range)
Trigger point Trigger time
Earlier Later
Stretch or compress the waveform
Change the magnication.
When the A and B cursors appear on the screen,
use the cursors as the standard to stretch or
compress.
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Analyze data
Zoom in and observe the waveform
1
3
2
4
Zoomed display
Normal display
The waveform in the blue frame is zoomed up.
Scroll through it operating the jog shuttle.
1
Move the cursor to the
magnication.
2
Press [ZOOM On].
The icon is changed to [ZOOM O󰀨], and
the screen is divided vertically into two.
3
Move the cursor to [Zoom Mag].
4
Change the magnication.
Read measured value
1. Set the A and B cursors.
Congure the setting on the waveform screen as follows.
Display the
waveform screen.
Move the
cursor.
Select the items to be set.
1
2
Displays the AB
cursor settings
window.
1
2
AB Cursors*
Set to [Trace].
Kind
Set to [a-B].
Subject Ch
Set to [ALL].
*The value to be displayed can be switched.
[Trace] Time value and measured value
[V Csr] Time value and frequency
[H Csr] Measured value
Values at B cursor
Di󰀨erence between values at A and B cursors
Values at A cursor
Time
Measured value of CH 1
Example
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Analyze data
2. Move the A and B cursors to the point you wish to observe.
B cursor
A cursor
Move the cursor to the point
of the measured value on
the waveform you wish to
observe operating the jog
shuttle.
Earlier Later
To change the cursor to be moved
Switch the [Kind] among the following:
[A] Use and move A cursor only (default).
[A-b] Use the A and B cursors.
Move the A cursor only.
[a-B] Use the A and B cursors.
Move the B cursor only.
[A&B] Use the A and B cursors.
Move the both simultaneously.
Display the waveforms eliminating overlap each other
When multi phenomenon are measured, the waveforms may overlap each other and become
di󰀩cult to observe.
When this happens, change the positions of the waveforms or the magnications on the vertical
axes on the display to recognize the waveforms easily.
The START key is pressed and
measurement has started but the
waveforms overlap each other and
cannot be recognized easily.
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Analyze data
Congure the setting on the waveform screen as follows.
Displays the
Waveform window.
Displays the Channel
settings window.
([Analog] sheet).
Move the
cursor.
Select the items to be set.
1
2
1
2
Congure the magnication and zero position
each channel.
Magnication
Waveform can be stretched
or compressed in the vertical
axis direction.
Zero position
The waveforms
can be placed at
other positions in a
vertical direction.
• Can be changed even during
measurement.
• Positions of logic waveforms can also be
changed arbitrary. ([Logic] sheet)
If direct current components are superposed on the waveform, the waveform appears to uctuate when the
magnication is changed. This is because magnication applied to the direct current component as well.
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Analyze data
Calculate the measurement data
Up to 16 items can be calculated at once.
The 24 calculations are provided include average value, e󰀨ective value, peak value, maximum
value, minimum value, cycle, and frequency.
The following describes the calculation method for the measured data.
Congure the settings on the status screen described as follows.
Move the
cursor.
Select the items to be set.
Displays the status
screen ([Num Calc]
sheet).
Numerical Calc
Set to [On].
Parameter
Set the calculation
conditions.
Type
Set the calculation type.
Channel
Select the channel to be calculated.
Once measurement is completed, calculation automatically starts. The calculation result will be
displayed at the upper right side of the waveform screen.
(In consecutive trigger mode, the next measurement will take place after the calculation has been
executed.)
Displays the
waveform screen.
When the setting window or
others is displayed on the
waveform screen, pressing
the ESC key will display
the calculation results.
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