App-16
IM DL850E-01EN
Appendix
Shunt Calibration Execution Menu
The shunt calibration execution menu appears when you select Linear Scale, Mode, and then Shunt in the CH
menu. In normal shunt calibration, only P2:Y is set. On the DL850E/DL850EV, in addition to performing normal
shunt calibration (when the shunt-calibration relay circuit is on), you can also set the zero-point value when the
relay circuit is off. The zero-point value is valid when the strain value after balancing is performed is not 0.
Items in the Execution Menu
(1) P1[X]: When shunt calibration is executed, the input value when the relay circuit is off is applied.
(2) P1[Y]: Set the value for when the relay circuit is off (normally 0).
(3) P2[X]: When shunt calibration is executed, the input value when the relay circuit is on is applied.
(4) P2[Y]: Set the strain value that corresponds to the shunt resistance when the relay circuit is on.
• When you execute shunt calibration, select an appropriate range so that the measured values will stay
within the range when the shunt-calibration relay circuit is on. The DL850E/DL850EV attempts to perform
shunt calibration within the current range.
• An error message will appear if shunt calibration fails (because of out-of-range values or some other
reason). When this happens, change the range, and perform shunt calibration again.
• Do not connect and disconnect multiple USB devices repetitively. Provide a 10-second interval between
removal and connection.
Reducing Noise
Because measurements are made at the mV level, the strain gauge is extremely susceptible to noise. If the
execution of balancing or shunt calibration fails, it may be due to noise. Please take the following points into
consideration.
• Because the strain gauge is attached away from the bridgehead, we recommend that you use twisted wire for
extensions.
• Use a bridgehead with high noise resistance. We recommended that you use a YOKOGAWA bridgehead
(701957 or 701958); they are highly resistant to noise.