MULTICAL® 403
Kamstrup A/S · Technical description · FILE100000166_B_EN-55121689_M1_07.2023
14.2 Functional description
Calibration equipment, e.g. type 6699-366, which is mounted in a standard MULTICAL® 403 base, includes
calibration PCB with connection terminals, microcontroller, control relays and precision resistors. You can simply
mount the calculator on this base instead of on the calculator base.
During test the calculator is supplied by the battery. The calibration PCB is powered by the USB. The microcontroller
simulates volume based on pulse frequency and the number of pulses per test point selected in METERTOOL HCW.
Temperature simulation is obtained by means of fixed precision resistors, which are automatically changed via relays
controlled by the microcontroller. After the test, the computer reads all registers in the calculator and compares the
values to the calculated reference values.
The calibration result of each test point is stated in percentage and can be saved in the computer under the serial
number of the tested MULTICAL® 403. Subsequently a test certificate can be printed.
14.3 Calibration data
The first time METERTOOL HCW and the calibration equipment are used, a number of calibration data must be
entered. This is done via the menu ”Adjust calibration unit” in METERTOOL HCW. Calibration data are electronically
included in the calibration equipment (also enclosed with the calibration equipment as a certificate on paper). In
order to transfer calibration data from equipment to program, select ”Adjust calibration unit” from the menu and
activate ”Read”. Calibration data is now transferred to and saved in METERTOOL HCW.
The calibration and program calibration data of the equipment are compared every time the calibration equipment
is connected. This is done in order to secure that calibration data in METERTOOL HCW are updated if the calibration
data of the equipment have been changed. A change of calibration data can be due to recalibration of the calibration
equipment. Calibration data in the calibration equipment can be maintained by changing its calibration data in
METERTOOL HCW and clicking on ”Write” to transfer new data to the equipment. In order to avoid unintentional
change of calibration data, the function “Write” 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 calibration data, the program automatically calculates the true k-factor in accordance with the
formula of EN 1434 and OIML R75:2002.
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