MA4-00296-R0
- 6 -
§４．Calibration
Calibration is done by two steps. One is that set the output voltage to zero when no load
is applied. Two is that set the desired output voltage when an object is loaded, which is
operated by actual load calibration using a reference weight as an actual load.
When this unit and Load Cell are combined to ship from TOYO, calibration has been done
at our factory.
４－１） Calibration method with actual load
1). Put nothing on Load Cell (only the initial Tare load is applied).
2). Turn a ZERO trimmer to adjust the output voltage to 0V.
3). Place a weight such as a reference weight on Load Cell and turn a SPAN trimmer to
adjust the output voltage to the relevant value of the weight.
4). Remove a weight such as a reference weight from Load Cell.
5). Confirm that the output voltage is 0V. If not, repeat from step 2) above.
If calibration cannot be done properly, refer to section §5 Troubleshooting and take
measures to solve a problem.
§５．Troubleshooting
If this unit is malfunctioning, please contact us if the problem cannot be solved by the
following measures. At this time, please inform us of the model name, product serial number,
the malfunction symptoms and usage as much as possible. The model name of Load Cell or
sensor connected to this unit should be also informed.
５－１） Basic check point
1). Check whether the power supplied voltage DC24V is normal and stable
2). Check whether the terminals are connected correctly and firmly
５－２） What to do if the desired calibration is not achieved
1). Zero adjustment cannot be done.
Zero adjustment range is ±15% against rated output voltage
If the output is more than 0V even if ZERO trimmer is turned fully counterclockwise
(CCW), mount an additional resistor, RT, to decrease the output voltage.
If the output is less than 0V even if ZERO trimmer is tuned fully clockwise (CW), mount
an additional resistor, RZ, to increase the output voltage.
2). When span adjustment, the desired output voltage cannot be set.
If the output goes below the desired value even if SPAN trimmer is turned fully clockwise
(CW), solder JP-1 to increase the amplification by one step.
If the output exceeds the desired value even if SPAN trimmer is turned fully
counterclockwise (CCW), solder JP-1 to decrease the amplification by one step.
4 steps can be set according to JP-1 jumper setting. If the desired output is not obtained
even if all the JP-1 jumper setting has been done, check whether Load Cell output satisfies
the sensitivity adjustment range of this unit.
The sensitivity adjustment range of this unit is -2.2mV/V to 2.2mV/V.
