Maintenance and cleaning
EC mAV 2
- 40 -
© SIKA
•
Ba_ECmAV2
•
03/2015
7.3
Recalibration
In order to keep the designed accuracy of this device, it is recommended to calibrate your
calibrator once a year. The following example shows the use of recommended standard
equipment to perform the calibration.
CAUTION! Material damage!
Overvoltage will lead to possible damage to the input section.
Never apply more than the max. permitted voltage to the input of the calibrator.
CAUTION! Material damage!
Any mal-operation will cause possible damage to their internal circuits.
Avoid short circuit and never apply more than the max. permitted voltage to the out-
put of the device or to a co-working standard device.
7.3.1
Selecting Standard Equipment
EC mAV 2 (to be calibrated)
Reference
standard
Range
Accuracy
Generation
(output)
20 mA DC
Digital meter &
standard re-
sistance
max. 22 mA
(input)
± (50 ppm + 0.4 µA)
Measurement
(input)
20 mA DC
mA Source
max. 33 mA
(output)
± (100 ppm +
0.2 µA)
28 VDC
V Source
max. 33 V
(output)
± (12 ppm + 15 µV)
7.3.2
Ambient Condition for Recalibration
Ambient temperature: 23 °C ± 1 °C
Relative humidity:
45… 75 % rH
Pre-heating:
Standard device should be pre-heated to specified time;
Put this Instrument in calibration environment for 24 hours, then
connect to the power, and set it in non-auto-power-off state, and
preheat for half an hour
IMPORTANT!
During the calibration, it is recommended to use 2x 1.5 V AA (LR6) batteries.
