Photoelectric Scanning Head SH 2003
The SH 2003 photoelectric scanning head is suitable for use with both LED impulse elec- tronic meters and Ferraris meters, selectable via a switch. Due to its high performance and robust construction it is suitable for both test consoles and portable systems.
Rotor disk scanning of Ferraris meters
The pulsed green light beam allows optimal recognition of differing disk marks, including red, black, matt and gloss. The signal output from the beginning to the end of the black mark is at a positive high level.
LED scanning of static meters
Optical impulse signals from electronic meters can be received and evaluated using the SH 2003 scanning head. The optical output of the electronic meter must have the following crite- ria:
1. The impulse length must be greater than 60 s.
2. With an LED signal having a space ratio 1:2, the frequency must be less than 500 Hz.
3. The wave-length of the received signal must be within the range 500 – 1000 nm.
The impulse output of the scanning head deliv- ers a positive impulse of approximately 1 ms on receipt of an LED signals impulse.