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47LLC OPERATING MANUAL EM-9505-B Rev.4
19. UsER CALIBRATION
User calibration is calibration by a customer using customer’s measuring instruments and standards.
To calibrate (adjust) the input signal, use “Teach Calibration” function. To compensate deviation between the DC output
and a device on site, use “Analog Output Adjustment” function.
The unit is calibrated correctly at shipment and therefore there is normally no need for customers to calibrate it.
19.1 TEACH CALIBRATION
You can calibrate the input signal by the Teach Calibration function if you need calibration. Input scaling value A and B can
be adjusted by applying actual load.
The internal calibration data is overwritten every time the unit is calibrated and it is stored even if the power is turned off.
However the data will be lost after an initialization.
Prepare measuring instruments and equipment for calibration by yourselves. Refer to each manual carefully for the instru-
ments and equipment for information on handling them.
19.1.1 TEACH CALIBRATION FLOW
The Teach Calibration is carried out as shown in the following flowchart.
IMPORTANT
•
Refer to 6. SETTING SCALING VALUES WITH ACTUAL LOAD to carry out the Teach Calibration with actual load.
•
Setting the load ratio enables the Teach Calibration even when the rated load is not ready. Refer to 6. SETTING SCAL-
ING VALUES WITH ACTUAL LOAD for details.
•
Close across the terminals 2 and 4 to carry out the Teach Calibration with measuring instruments.
•
Warm up measuring instruments for the time specified in each manual, and operate the unit in a stable condition.
•
The procedures to carry out the Teach Calibration using measuring instruments are same as those described in 6.
SETTING SCALING VALUES WITH ACTUAL LOAD.
Teach calibration (ZERO)
POWER ON
Warming up (10 min. or more)
Teach calibration (SPAN)
Moving on to Scaling Setting Mode
Back to Measuring Mode
Measurement started
Setting load ratio
Recalibration
(readjustment)
Calibration (adjustment) completed
Confirming display value
(operation check)