How to Retrieve Trigger Time From Hioki .mem Files in LabVIEW

This document explains how to retrieve the trigger date and time from Hioki waveform recorder .mem files when using LabVIEW. You typically encounter this situation when you can successfully read measurement data from .mem files but cannot locate the trigger timestamp. The trigger information is stored as channel group properties rather than standard waveform data, so it must be accessed differently.

To extract the trigger date and time from the .mem files, follow the following steps.

1. Use Read Data [Channel Group] to load the channel group
2. Confirm that the output returned from the Read Data [Channel Group] is an array.
3. Use the Index Array to work with the returned array structure.
4. Use Get Property.vi to access the properties of the channel group.
5. Select the following properties to retrieve the trigger information:
   • Trigger Date
   • Trigger Time
6. Extract and display or log the retrieved values as needed in your application.

After completing these steps, you can successfully retrieve and use the trigger date and time associated with the .mem file acquisition. This information is accessed as metadata (properties), not as channel waveform data.