Measure the Instantaneous Power Failure and Voltage Drop of Utility Power Supplies (50/60 Hz)
Observe and record the instantaneous power failure and voltage drop waveforms of utility power supplies.
Use the MR8870 Memory Recorder to capture the instantaneous power failure and voltage drop waveforms that cannot be captured by a general level trigger.
A level trigger displays and records the measurement data before and after a voltage level. That is larger or smaller than a voltage level that was set. A special trigger is used to capture the instantaneous power failure and voltage drop for which a level trigger cannot be used.
Example settings for detecting when a 230 V commercial power source falls below 210 V:
Connect the MR8870 to the utility power supply.
Set 10 ms for the time axis range and 50 V/div for the voltage axis.
Recommended trigger settings are as follows.
-1. Trigger Mode ：[Repeat] or [Single]
-2. Pre-Trigger ：50%
-3. Trigger Source ：OR
-4. Trigger on CH1 ：Select Voltage drop trigger [Drop]
-5. Frequency ：Select the frequency of the object to be measured (50 HZ / 60 Hz)
-6. Voltage Level ：Select 296 V (when measuring a 230 V utility power supply)
The trigger is activated when the voltage peak is less than the set level over a half cycle.