A measuring system is always customized and in many cases designed according to some basic versions:
Fixed testing racks are convenient for testing smaller quantities of meters in laboratories. They are made of aluminium profiles and have 5, 10 or 20 measuring places in their basic versions. At a version with 20 measuring places, 10 meters can be clamped on each side of the rack or all of them are clamped on one side. Photo-scanning heads with adjusters and error meters are provided on the rack. Photo-scanning heads can be adjusted individually or/and in a group.
Tunnel versions greatly increase the system efficiency since the meter assembly and disassembly are carried out outside the meter testing procedure. The meter heating and attribute measurements (start-up and running with no load) are carried out with special devices separately from the system. A testing tunnel consists of aluminium profiles where error meters and photo-scanning heads are mounted. Photo-scanning heads can be adjusted individually and/or as a group. Measuring places are arranged in two lines of 10 or 20 places on each side. The meters that will be tested are fixed and electrically connected on the rack consisting of aluminium profiles. The rack has the same arrangement of measuring places as the tunnel. It is connected to the supply source by means of special power and (optionally) signal terminals. The tunnel is provided with a built-in mechanism that automatically locks the transport rack when inserted.
Adapted versions are mainly used for automation in the meter manufacturing process. A horizontal fixing system is the most frequently used and it is the most convenient for manipulation with a test piece where different actuators (pneumatic, hydraulic, robot) also have the simplest access to the test piece testing points.
The racks of all types can be provided with optionally integrated fast clamping devices and can be performed with built-in current or voltage transformers for measuring meters with closed voltage and current circuits. They are optionally equipped with an optional number of auxiliary contacts, clamps and other terminals.