Instruction Manual
IM-105-4000, Rev 1.3
October 2008
OPM 4000
http://www.raihome.com
Section 6
Zero and Span Calibration
Clear on Stack Zero and Span Calibration . . . . . . . . . . . . page 6-1
Zero Reflector Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . page 6-3
Span Filter Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 6-4
Record the Zero/Span Values in the Quick Menu . . . . . . page 6-4
OVERVIEW
This section describes how to install, adjust, and record the zero reflector and
span values.
CLEAR ON STACK
ZERO AND SPAN
CALIBRATION
Conditions prior to calibration.
• Do not attempt these adjustments in inclement weather.
• A clear stack condition must exist to perform this calibration.
• Power must have been on for no less than 30 minutes.
NOTE
After the cover is removed from the transceiver, normal levels of day light in
the area will not effect the calibration.
To complete this procedure the zero jig on-line test kit, with a high filter of at
least 0.8 OD, is required.
1. Swing both the retro reflector and transceiver open and clean the
protective windows (Figure 6-1). Return both to the closed position.
2. Verify alignment; the beam must be centered on the TTL target. Refer to
the "Beam Alignment Procedure" in Section 2: Installation.
3. On the transceiver, remove the screw below the target viewing window
and pull the housing straight back until it clears the optical plate.
4. On the service module make sure the NORMAL/TEST switch is in the
NORMAL position.
NOTE
All adjustments are on the R/M signal processor board (Figure 6-2).
5. Adjust the zero potentiometer (PT-1 Zero) clockwise until the opacity
reading is greater than 15%.
6. Slowly turn the zero potentiometer counterclockwise until the opacity
reads 0-1%.
7. Install the zero jig on-line test reflector on the transceiver and attach the
device to the transceiver with the mounting screw.
Summary of Contents for Rosemount Analytical OPM 4000
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