American Aimers B4A - Manual (Page 17)

B4A manual page 17 Page 1 of 1
http://www.hopkinsmfg.com/test2/b4a_manual_page_17.htm 8/13/99
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B4A Instruction Manual
Page 17
6. TO CHECK VERTICAL AIM CALIBRATION
With OWNER'S CALIBRATION FIXTURE level vials both centered, turn vertical dial knobs of each aimer until
aimer level vials are centered (Fig. 4).
If aimer vertical dial pointers read between 1/2 "up" and 1/2 "down", aimers are within allowable vertical tolerance
limits. RECALIBRATE IF UNIT IS BEYOND THESE LIMITS. (See aimer calibration instructions.)
7. TO CHECK HORIZONTAL AIM CALIBRATION
Adjust horizontal dial knob of each aimer until split image targets align. If aimer horizontal dial pointers read
between (1) "left", and "right", the aimers are within allowable horizontal tolerance limits. RECALIBRATE IF UNIT
IS BEYOND THESE LIMITS. (See aimer calibration instructions.)
AIMER CALIBRATION
Aimers determined to be out of calibration may be adjusted as follows:
1. With aimers attached to plate glass window, check to see that both OWNER'S CALIBRATION FIXTURES
level vials are centered and
both aimer FLOOR LEVEL DIALS are set at zero.
2. Set aimer vertical dial pointers at zero on both units.
3. Set aimer horizontal dial pointers at zero.
4. TO CALIBRATE VERTICAL AIM: Using a .050 inch Allen wrench, turn level adjusting screw until the level is
centered on one aimer.
Repeat this process for the opposite aimer (Fig. 5).
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