Fluke VT650 User Manual page 17

Figure 2 shows the back of the Analyzer.
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
Handle clip

USB port
 Oxygen sensor door
2
6 5 4
Figure 2. Back of the Analyzer
O2 SENSOR ACCESS DOOR
3
D
External trigger input (VT900)
E
Battery status indicator
F External DC power input
Gas Flow Analyzer
The Analyzer
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9