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MULTICAL®
602
Kamstrup
A/S
∙
Technical
Description
∙
5512
‐
931_N1_GB_11.2016
119
13.2.3
Function
Verification equipment, e.g. type 6699-399, which is mounted in a standard MULTICAL
base, includes battery,
verification PCB with connection terminals, microprocessor, control relays and precision resistors.
The calculator can simply be mounted on this base instead of the calculator base.
During test the calculator is supplied by the battery. The verification PCB is powered with 12 VDC by the enclosed
external mains adapter. The microprocessor simulates volume based on pulse frequency and the number of pulses
per test point selected in the computer program. The temperature simulation is obtained by means of fixed
precision resistors, which are automatically changed via relays controlled by the microprocessor.
After test the computer reads all registers of the calculator and compares these values to the calculated values.
The calibration result in percentage of each test point can be stored in the computer under the serial number of the
tested MULTICAL
602 to be printed out later on a test certificate.
13.2.4
Verification data
The first time METERTOOL HCW and the verification equipment are used a number of calibration data must be
entered into the menu ”Verification unit settings” in the program METERTOOL HCW. 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 unit settings” from the
menu and activate ”Read”. Calibration data is now transferred to and saved in the program METERTOOL HCW.
The calibration data of the equipment and the program verification data are compared every time the 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 the verification data in the program METERTOOL HCW and
klicking on ”Write” this new data into the equipment. In order to avoid unintentional change of calibration data
”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 verification data the program automatically calculates the true k-factor in accordance with the
formula of EN 1434 and OIML R75:2002.