DS-2000 Frequently Asked Questions

Question number FAQ-0672

When measuring with frequency weighting set to 'A characteristic: ON' on the DS-0221, the values changed when I reopened the saved power spectrum. Could some settings be affecting this?

Saving in text format retains the values of the data displayed on the screen as they are. Therefore, if you measure with frequency weighting set to 'A characteristic: ON' on the DS-0221 and save that data in text format, the data with 'A characteristic: ON' will be saved. If you then reopen this text data on the DS-0221 and set the frequency weighting to 'A characteristic: ON' again, a power spectrum with double A characteristic will be displayed. In this case, please use frequency weighting set to 'A characteristic: OFF'.

Operation procedure for turning the frequency weighting 'A characteristic' ON/OFF.

Click on the current data (data being measured) to activate it, then set "Analysis → Frequency Weighting → OFF" from the menu.
Open and play the saved power spectrum text data.

Supplementary Explanation
The menu "Analysis → Frequency Weighting → A-Characteristic ON" is designed to display the results of secondary calculations performed on the measured raw data. Saving in ".dat format" preserves the raw data. Therefore, if data saved in ".dat format" is played back, setting "A-Characteristic: ON" will display the results after applying the A characteristic once.

upper section	Data measured under A characteristic ON (current data)
interruption	The upper segment saved in txt format is played back (Due to the A characteristic being ON, the A characteristic is applied twice. Therefore, the overall value differs from the upper segment. This value depends on the frequency distribution of the data and can be either larger or smaller than the original data).
the next section	This is a playback of the data saved in '.dat format', and it has the same overall value as the upper section.

Last updated date: 2006-11-20