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PRESYS
⏐ Instruments
4.4 - Calibration
WARNING: Only enter the following options after completely understand
them. Otherwise it might be necessary to send the instrument back to factory for
recalibration. Calibration in this manual means adjustment.
The DCY-2058 and 2059 Stations are accurately calibrated at factory and will not
require periodic recalibration under normal conditions. If, for any reason, a recalibration
is required, follow the procedure described below.
Disconnect the process signals from the Station I/O terminals.
Prior to carrying out the calibration allow the instrument to warm up for at least 30
minutes to ensure that it reaches stable operating conditions.
This section contains basically two parts: input calibration and output calibration.
Input calibration
The input calibration describes the procedure to be followed when calibrating
input 1 (for single or dual loop Stations) and input 2 (only for dual loop Stations).
The accuracy and precision of the reference generating calibration equipment
should be, at least twice as good as the Station specifications.
References on the following tables relate to the input type to be calibrated. The
column on the right on these tables shows the mnemonics displayed in the calibration
process.
Always check that the internal jumper configuration correctly matches the input
type to be calibrated.
Prior to carrying out the calibration procedure, access Calibration level 4. The
calibration level is provided with a password system which prevents the inadvertent
access to this level and the likelihood of damaging the Stations calibration parameters.
The access password to this calibration level is number 5.
Once the calibration password is provided, select the input type to be calibrated
within the INPUT option. Select the channel to be calibrated by pressing ENTER. The
display will show the mnemonics corresponding to the references required by the
calibration process. Those references should be entered prior to the display of the
corresponding mnemonic and the calibration procedure is started by pressing ENTER.
At this time the Station starts the calibration procedure and the display will flash the
mnemonic CAL.
While the display is flashing, the reference should remain connected to the input
channel to be calibrated.
When the display stops flashing and the corresponding mnemonic is back on
screen, the calibration process for the first point will have ended.
Change to the next reference and press the DOWN key to select the next point.
Allow at least 1 minute between any two calibration points. After this time is elapsed,
press ENTER to start calibration of the second point.
After running through the two references on the table relative to the input type to
be calibrated, the calibration process will have been completed.
In the event that the calibration of any particular point has not been properly
carried out, there is always the possibility of having that particular point recalibrated
without damaging the calibration of any other already calibrated points.
DCY-2058 and DCY-2059
Maintenance
Page 30
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