Custom Scaling using Logarithmic Scale

[ronni]

I am using Cosa dew point sensors to monitor the moisture on an analysis in units of PPMv.  I was told the problem with sensitivity that I was seeing was due from this being a logarithmic scale.  I had both units scaled incorrectly.  Is there a way to create a custom logarithmic scale.  I see the linear, mapped ranges, table, etc but nothing about logarithmic in the create a custom scale area.

Thank you in advance for you help with this.

Brandi

[Ali M]

Hello,

Using SignalExpress, have you tried the Formula step? (Add Step»Processing»Formula). Several Log functions are available using Formula (see link below). Additionally, you can format scales/grids on graph and chart displays by clicking the Properties button on the Data View tab, then selecting the Scales tab. Here you can place a checkmark on Log to map the scale logarithmically. Removing the checkmark from this checkbox will map the scale linearly.

1. LabVIEW SignalExpress 2009 Help: Formula: http://zone.ni.com/reference/en-XX/help/371268K-01/expresswb/formula__scalar/

Best regards,

Ali M

Applications Engineer

National Instruments

Message Edited by Ali M on 05-04-2010 01:46 PM