Calibration Handbook
74 Searchline Excel
View image with eye placed approximately 3 inches from viewfinder. Use viewing position that ensures
full circular view is in sight.
An ellipse appears when slightly off axis. Do not adjust using telescope’s elevation and windage adjusters
- they are factory set
Iteratively tighten and loosen each pair of adjustment screws sequentially in horizontal and vertical
directions until setting is correct. When correctly adjusted, tighten both adjustment screws simultaneously
Check alignment and repeat steps as necessary
Crosshairs
Mirror
Distant Excel Unit
Telescope Viewfinder
Before Alignment
Off-axis View
After Alignment
Crosshairs
Distant Excel Unit
Align Excel using XNX to determine optimal performance. As alignment is performed, XNX display indicates
signal strength in a bar graph.
11. From the XNX Calibrate menu, perform careful alignment of Excel, insuring signal strength bar graph
reaches or exceeds 1.00 as shown on display.
12. Use fine adjustments to adjust the Excel alignment until signal strength bar reaches or exceeds 1.00.
13. Once completed,
✖
to exit Align Excel Mode and perform Zero Calibration
Zero Calibration
Before Zero Cal, ensure area is free of combustible gases
1. From the Calibration menu, select the Gas Calibration option.
2. Perform a zero calibration. When concentration values are stable, select
✓
for XNX to calculate the zero
adjustment .
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