Ohaus DEFENDER D500M MECHANICAL BENCH SCALE Manual - Manual (Page 9)

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OHAUS CORPORATION
The rule is to lengthen the distance between the fulcrum and the load pivots to increase the indication. Conversely, shorten
the distance between the fulcrum and the load pivots to decrease the indication. Use hone part number 085061020 (fine) and
part number 085062020 (coarse) to adjust the pivots.
Note the direction of honing. Always hone away from the load edge of the pivot.
1. Side to Side
To correct a shift error side on a lever, note the indication at each location, and hone the load pivot as needed to correct
the side to side error on either lever. Hone only the load pivots to correct an error on either lever for a side to side correction.
2. Front to Back
When the indications on each load point of each lever are equal side to side and the indications of the levers are different
front to back, then hone the power pivot of the short lever until the two levers are equal front to back. Do not hone the
power pivot of the long lever. Increase the pivot distance from the power pivot to the fulcrum pivot on the short lever
if the short lever has a higher indication than the log lever.
When the Shift error is corrected, recalibrate the scale and retest the shift. Continue calibration and shift test/adjustment
until no shift error is found after the scale is calibrated.
V. ZERO ADJUSTMENT (as needed)
Check the zero balance by positioning the beam poise at "0" on the beam. Turn the locking lever to free the beam. The
beam should float without touching the top bottom of the trig opening. If it touched the top, turn the zero adjustment screw
(Figure 4) counter-clockwise with a screwdriver. Turn the screw clockwise until it is touching the bottom.
VI. OPERATING INSTRUCTIONS
A. SCALE OPERATION
The OHAUS D500M beam utilizes a balancing beam principle to indicate weight. With the scale loaded, slide the
beam poise toward the trig loop (away from the column). Adjust the beam poise until the tip of the beam is in a balance
state within the trig loop. The position of the beam poise indication (red pointer) on the beam will indicate the amount
of weight on the scale platform.
NOTE: When operating the scale, use wedges at the two wheels to prevent the scale from moving.
TO LENGTHEN
THE DISTANCE
TO SHORTEN
THE DISTANCE