A pair of systems designed to measure lamp warming per EN 60598-1 ed.5. This system replicates older systems that have been used for about four years, also from our company. At the same time, the new system is making some changes to be applied to older systems.
Physically, each system consists of a multimeter, an electronics box, and a computer with a program. These parts are interconnected via a computer LAN.
The measuring instrument Keithley 2700/E is the basis of the system. The instrument includes a precision digital multimeter and a pair of 20-channel differential multiplexers with cold-end thermocouple temperature sensing. Inputs are insulated on each other and from the housing and are led to the connector box – see figure. Keithley’s measuring instrument is connected with the computer via an RS232 line, converted to Ethernet in the electronics box. In the same way, an RS232 signal is generated for a programmable power supply that powers the lamp during the test.
A pair of Adam 6066 modules complement the system. They are connected to the Ethernet (LAN) to control the measured lamp, create non-standard states in it, and control the heating in the test chamber. Each of them provides six relays with 250V 5A contacts. These contacts are strengthened by power relays (contactors). Each is powered via the Total STOP button. Pushing button moves all contactors into the idle position and thus disconnects the measuring circuit and discharges any charges in case of emergency.
The control program is created in three layers; each is accessible to the operating personnel.
The base layer allows working in so-called regular operation when the program performs prepared activities following the standard and carries out the lamp test. In this layer, it is also possible to define individual tests, i.e., the sequence of steps that compose the test. The resulting test definitions can be saved in a file for further use.
In the lower layer, it is possible to control certain measurement parts manually. For example, an operator can measure all channels and define all measured channels and their properties. This layer can set up and test the individual measurement components that compose the regular operation.
In the lowest layer, there is the possibility of direct control of individual components of the measuring system. In this layer, it is possible to switch individual relay contacts or directly control and change all the Keithley multimeter or power source possibilities.
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