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Chapter 5 – Measuring with the Photodiode Head 
Additional Graphical Display Options 
To display readings in dBm scale: 
1.  Select dBm from the Display drop down list in the Graph Configuration 
Area. The Graph Limits field modifies to reflect the selection, as shown in 
Figure 5-7. 
 
Figure 5-7 Graph Configuration Area 
2.  In the Graph Configuration Area, use the Min Value and Max Value 
pointers to select the minimum and maximum dBm values.  
The values you select are automatically displayed on the graph in the Display 
Area, as shown in Figure 5-8  
 
Figure 5-8 Photodiode Window Display Area in dBm Scale 
Applying a dB Offset 
To apply a dB offset: 
3.  Click 
 in the Graph Configuration Area. The dB Offset button 
toggles to dB Offset On when the Offset is activated. 
The dB Offset value is displayed under the main measurement reading in the 
Numeric Display Area. 
To cancel the dB Offset: 
1.  Click 
 in the Graph Configuration Area. The dB Offset value is 
cancelled.  
StarLab User Guide 
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