Yokogawa DR240 - Manual (Page 222)

13-7 IM DR231-01E
Trouble-shooting and Maintenance
13
13.5 Calibration
Overview
We recommend that you calibrate at least once a year to assure its measurement accuracy. When
calibrating, please contact your nearest Sales representative at its address on the back cover of this
manual.
Press and hold the MODE key and then turn on the power switch to place the recorder in the
calibration mode. Select the module to calibrate the recorder on a module basis. After
completing the calibration, turn off the power and then turn it back on when resuming the
measurements.
CAUTION
You can use the DISPLAY mode only for a calibration adjustment. If it is
maladjusted, the recorder may become faulty. For details, please contact
your nearest Sales representative.
Calibration needs selection of:
• a module and;
• the calibration mode.
Once the module has been selected, it is no longer selected again as long as the calibration END
mode is not executed.
Calibration mode
• CAL/EXEC mode: This mode enables specified ranges to be calibrated.
• DISPLAY mode: This mode enables current calibrated values to be displayed.
• END mode: This mode enables calibrated values to be stored in the internal nonvolatile
memory and terminates the calibration mode. (If ABORT is selected, the calibrated values are
not stored in memory.)
Module selection error
The following error messages are displayed:
• The specified module remains disconnected (ERROR141).
• The specified module is such that it cannot be calibrated (ERROR143).
Calibrated data error
The following error messages are displayed:
• Attempted to remove the module during calibration. Or hardware error: ERROR145
• Invalid calibrated data: ERROR144
• Attempted to set invalid numeric values in the DISPLAY mode: ERROR145
Note
When a calibrated data error appears, the error data are stored in memory.