BART LABDMM2, Руководство пользователя

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LABDMM 2 USER GUIDE
MO.LABDMM2.560.ENG.R1
Pag. 20
28. PRESSURE CALIBRATION
ATTENTION: the incorrect execution of this procedure can make the following measurements
unreliable.
This procedure is reported in this manual only as documentation, but must be performed only
by authorized calibration centers and in case of actual need.
BART
declines all responsibility for measurement errors or malfunctions that may result from
incorrectly performed adjustments, which also invalidate any ACCREDIA certification of the instrument.
The instrument is supplied calibrated and calibrated, but if a calibration deviation is noticed over time during
the periodic calibration, it is possible to correct the reading error.
The reading error is adjusted by modifying the gain factor (default 1.0000).
If the reading is higher than the reference, the gain must be reduced.
If the reading is lower than the reference, the gain must be increased.
The pressure gauge manages 2 independent gains: positive gain for the PRESSURE measurements and the
negative gain for the VACUUM measurements.
The correction must be performed by evaluating the reading error on a pressure higher than 75% of
the full scale measured by a reference sample with
uncertainty ≤0.020%
+
Press the keys simultaneously for a few seconds SET and PEAK.
P00000
Set the password 8888 (

) and confirm with SET.
GAInP
X.XXXX
Positive Gain for the PRESSURE , confirm with SET.
Modify the value with the keys

and confirm with .
GAInn
X.XXXX
Negative Gain for the VACUUM , confirm with SET.
Modify the value with the keys

and confirm with .
End
End of the procedure.
Example: Pressure gauge with nominal capacity of 5 bar
REFERENCE pressure 5.0000 bar, pressure MEASURED 5.0010 bar
Calculate the gain with following formula:
REFERENCE pressure 5.0000
Gain = ----------------------------- = ------------ = 0.9998
MEASURED pressure 5.0010
Programmable gain value : from 0.7500 to 1.500
To reset the gain to the factory value, set the value to
1.0000
For a better accuracy, calibrate in PRESSURE and VACUUM.
If you do not calibrate the VACUUM, set the same value for both the PRESSURE and VACUUM.