SIKA EC mAV 2 - Recalibration; Selecting Standard Equipment; Ambient Condition for Recalibration

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.