11
ZERO: This controls how close the scale needs to be to the true zero point before lighting the zero indicator on the bottom of
the main display. It is set in units of d, as explained in MOTN above. The factory default setting is .25d, or one quarter of the
scales lowest displayed resolution.
Calibration and Troubleshooting
Your scale has been precisely calibrated at the factory before shipping. It has the capability to adjust its own calibration to a
certain degree to compensate for aging electronics, and temperature changes. This being the case, it is possible that you will
never have to calibrate the scale. Doing so may leave you with a worse calibration than you started with. Does your scale really
need to be calibrated? If so what steps are needed? Follow the steps outlined below to help make this determination.
Scale reads zero and will not move.
•
Make sure that any and all shipping screws are removed from the platform.
•
On platform scales, check that all four level legs are contacting solidly against the floor.
•
If level legs are screwed in all the way then the stud from the level leg may be contacting the underside of the platform
not allowing the load sensor to flex.
Scale reading is fluctuating wildly.
•
Scale must be on a non-vibrating surface. Breezes may affect scales of lighter capacities.
•
Scale must be installed on a clean power line. Electric motors, computers or any other devices can cause power line
interference.
•
RF interference can cause scale readings to fluctuate. Are there any transmitters nearby like cell phones or walkie-
talkies?
•
If the scale is a remote platform type, check to see if the cable from the platform to the indicator in plugged in properly.
If so then remove the plug temporarily to check for bent or missing pins.
•
Check for nicks or cuts on the platform cable.
Scale reading is different on different areas on the platform?
•
On platform scales, check that all four level legs are solid against the floor. If a level leg is screwed in all the way then
the stud from the level leg may be contacting the underside of the platform not allowing the load sensor to flex.
•
Check for any mechanical interference. Is there anything rubbing against the platform?
Scale corners properly but does not indicate the correct weight.
•
On platform scales check that all four level legs are solid against the floor.
•
Check for any mechanical interference. Is there anything rubbing against the platform?
•
Perform span calibration.
Span Calibration
Span calibration is used to set the internal gain of the indicator so that it reads correctly. A calibrated weight is needed in order
to perform a span calibration. Any weight may be used within the capacity range of the scale but a weight of 50% of capacity
is recommended. Using weights of less than 10% of capacity is not recommended and may lead to an inaccurate calibration.
To start the procedure access menu SETUP MENU/PLATFORM SETUPS/SPAN CALIBRATION. The scale will prompt you for
the value of the calibration weight in pounds. Enter the value through the keyboard and then press ENTER. Next, you are
asked to remove all weight from the platform. When the weight is removed press ENTER. Now place the calibration weight on
the center of the platform, pause a second for the scale to stabilize then press ENTER. The scale will now calibrate itself
automatically and return you to the platform menu.
During span calibration a small number will be displayed in the upper left-hand corner. This number represents the raw
unadjusted reading from the load cell and is not calibrated in any way. It is there only to confirm that the platform is operating
properly. The number should increase when weight is applied to the platform.
