Home  |  Site Map  |  Contact   


Product Support: Knowledge Base

Our on-line Knowledge Base contains answers to some of the most common support questions. It has information about all PGR products and was developed to help customers resolve product issues. It is constantly updated, expanded, and refined to ensure that our customers have access to the latest information.

Knowledge Base Search

Search For: In:
Any Word All Words Exact Phrase
Show:
 
Calculating Firefly and Firefly2 gain settings
Article 155: Calculating Firefly and Firefly2 gain settings
SUMMARY:
It is often useful to know how to convert from the gain units presented by the API to real world values. This article details how this conversion is made.
APPLICABLE PRODUCTS :
Firefly (Discontinued) •  Firefly2 (NANC) • 
ANSWER:
It is often useful to know how to convert from the gain units presented by the API to real world values. This article details how this conversion is made.

The Firefly and Firefly2 are designed around the Texas Instruments TLV990PFB chipset, which provides users with a gain range from -0dB to +36dB. For more information on this chipset, consult the TI datasheet chipset datasheet at http://focus.ti.com/lit/ds/slas282/slas282.pdf.

Unfortunately, the TLV990PFB datasheet does not provide a gain conversion formula to convert the whole number gain units (as displayed in the PGR FlyCap program) to real-world dB values. However, PGR has determined that each gain unit (0 – 255) represents approximately 0.14 dB of Gain. This is derived from the following assumption:

36 dB/255 steps = 0.14dB/step

Therefore a linear approximation of the equation would be:

Gain (dB) = (36/255) * x

where x = the number of steps.
RELATED ARTICLES :
KB Article 34: TI Chipset used with the Firefly and Firefly2
KB Article 55: Calculating Firefly and Firefly2 shutter (integration) settings
KB Article 194: How do the Firefly and Firefly2 differ from other PGR Imaging Products?

ARTICLE INFO:
Article ID:
 155
Published:
 12:00:00 AM
Last Modified:
 12:00:00 AM


ARTICLE FEEDBACK:
How useful was this article?
less
more
1
2
3
4
5
Additional comments or suggestions?

Go Back Printable Version Email This Article Bookmark This Article

 
 
 
Support Hot Topic 

Point Grey Fly Capture
FlyCapture 2.3 Release 18 is available for download!
Download Software


 © 2012 Point Grey Research, Inc. | Privacy  |  Legal  |  Terms and Conditions