Kamstrup MULTICAL 402, Technical Description, Page: 102 / 113

MULTICAL® 402
102
Kamstrup A/S · Technical Description · 5512-742_M1_GB_01.2016
14.5.3 Function
Verification equipment type 66-99-372 and 66-99-373 is housed in a standard MULTICAL
®
The connection between verification equipment and MULTICAL
base and comprises
battery, connection PCB, verification PCB, microprocessor, control relays and precision resistors.
®
During verification the temperature sensors must be dismounted from the terminal block.
402 consists of a 16-pole test connector.
During the test the calculator is supplied by the battery. The verification PCB is powered with 12 VDC by the
enclosed external mains adapter. The microprocessor starts auto-integration and temperature simulation is
obtained by means of fixed precision resistors, which are automatically changed via relays controlled by the
microprocessor.
After the test the computer reads all registers in the calculator and compares the values to the calculated values.
The calibration result in percentage for each test point can be stored in the computer under the serial number of
the tested MULTICAL

14.5.4 Verification data
402 to be printed out later on a test certificate.
The first time METERTOOL HCW and the verification equipment is used a number of calibration data must be
entered into the menu ”Verification unit settings” in the METERTOOL program. Calibration data is electronically
included in the verification equipment (also enclosed with the verification equipment as a certificate on paper). In
order to transfer calibration data from the equipment to the program select ”Verification” from the menu
”Settings” and activate ”Read”.
Calibration data is now transferred to and saved in the METERTOOL HCW program.
The calibration data of the equipment and the program verification data are compared every time verification
equipment is connected in order to secure that verification data is updated if the calibration data of the
equipment have been changed. For instance this can be due to recalibration of verification equipment.
Calibration data of the verification equipment can be maintained by changing verification data in the program
METERTOOL and writing the new data into the equipment. In order to avoid unintentional change of calibration
data this writing is protected by a password, which can be obtained from Kamstrup A/S.
Calibration data include test points, permissible error, uncertainty, ambient temperature (fixed value) and
number of integrations per test.
Having entered verification data, the program automatically calculates the true k-factor in accordance with the
formula of EN 1434 and OIML R75:2002.