Open in Separate Window          Return to FAQ

Power Band Alarms in 0-Peak Scaling Instead of RMS

The information provided is for help with Commtest Instruments products:


Note: Applies to Ascent/MAS VB 7.41 and earlier only.

QUESTION

I would like to enter the thresholds for my power alarm bands using 0-peak (or peak-peak) scaling but the Ascent program only works in rms.

ANSWER

The vb instrument and Ascent software display power measurements for alarm overalls and bands using rms scaling (there is a separate FAQ article explaining the reasoning behind this). However, it is now possible to enter your power alarm band thresholds using 0-peak or peak-peak scaling. This can be done in several ways:

  1. If you own Ascent Level 2 you can use ISO standards or TA's Proven Method to create your alarm bands automatically. This is available under Alarms>TA & ISO alarm Creator and is described in the online help (Walk-through: Proven Method). You can choose any scaling within this utility by using Set measurement units.
  2. From the menu select Edit>Edit Alarms>Add Band Alarms. This opens the Band Alarm Editor, which can add any type of Alarm Band using any scaling to the currently selected measurement locations.

    band_alarm_editor

  3. Double click on a power band alarm on a chart - this opens the Band Alarm Editor as above.

When you plot your recordings the software will still display the overalls and alarm thresholds using rms scaling. Any alarms which you entered with 0-peak or peak-peak scaling will have been correctly converted to rms for you.

FAQ ID: 11605 Last Reviewed: 21/09/2005