1. Display the measurement guide screen.
(See page 1.)
2. Select “Voltage drop of power outage, etc.”.
3. Configure the settings as shown below.
4. Select “Start measurement”.
The start confirmation dialog will be displayed.
5. Press the START key to begin measuring.
The MR8880-20 will measure ONCE, and display a
waveform like that shown below.
Capturing the Waveform of a 200 V AC Instantaneous Power Interruption
How to measure the waveform level (instantaneous value) of the waveforms before and after an instantaneous power out-
age on a 200 V AC/60 Hz commercial power supply
Select
Apply
4
Select
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2
6. If the waveform you wish to see is not displayed,
change the zoom ratio of the time axis.
7. Scroll through the waveform to check for anomalies.
Select
Apply
6
Press this key to display the "Scroll" icon on the bottom of the screen.
(This key toggles between "Scroll" and "Cursor".)
Fast scroll
backward
Fast scroll
forward
Scroll backward Scroll forward
• Use the Scroll function to "fast forward" or "go backwards" through
the waveform.
• To jump to the beginning of the waveform or the latest waveform
captured, press the "fast" and "standard" keys at the same time.
When the zoom ratio of the time axis is changed, the
waveform printout will also zoom in or out accordingly.
1. Press the SET key to open the “Setting” screen.
(Use the SET key to toggle between the 7 screens
until you reach the "Setting" screen.)
2. Configure the parameters in the areas indicated
below.
3. Press the SET key once to open the “CH” screen.
Using Model 9018-50 Clamp On Probe to Measure a Current Waveform
How to measure a 10 A AC/50 Hz current signal using Model 9018-50 Clamp On Probe
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2
1
A 50 Hz measurement frequency is equivalent to 20 ms per cycle.
When using the 5 ms/div time axis range and selecting to record 15
divisions, a 75 ms waveform can be monitored. (5 ms/div x 15div =
75 ms) This is equivalent to approximately 3.5 cycles.
4. Configure the parameters in the areas indicated
below.
5. Press the START key to begin measuring.
"Waiting for trigger" will be displayed until the set trig-
ger conditions are met.
When the trigger is activated, measurement will occur
once.
The following shows the measured waveform of the
starting current of a motor.
3
• The voltage axis range (refer to the "Range" information in the
upper highlighted section in the screen above) represents the volt-
age value per 1div on the vertical axis. (=100 mV/div)
• Because the output of the 9018-50 at the 10 A AC range is 0.2V
AC, the instantaneous peak value of 0.2 V AC will be approxi-
mately 0.28 V (=0.2 V AC x √2). As such, please select a voltage
range in accordance with this level of voltage.
• Because the full scale of the MR8880-20's vertical axis is 10 divi-
sions, when the voltage axis range is set to 100 mV/div, instanta-
neous values up to 1 V (=100 mV/div x 10div) can be measured.
• When changing the current range of the 9018-50 Clamp On
Probe, be sure to also change the "Range" setting in the MR8880-
20 (in the lower highlighted section in the screen above).
• If the measurement ranges do not match, incorrect measurement
values may be displayed and/or recorded.
• The value to set for the trigger level is the instantaneous value.
"0.100 V" is equivalent to "5 A".
T
0.00 A
Trigger point
5.00 A
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