LRT 640 - Low Resistance Tester
- Integration in automatische Anlagen über Ethernet- und SPS-Schnittstelle
- Handmessplatz für die Bauteilprüfung in Produktion und Qualitätssicherung
Features
- Widerstandsmessung an bis zu 4 Messstellen gleichzeitig
- Messbereich 1 bis 100 mW
- Kontaktprüfung vor jeder Messung
- Messung in Vierleitertechnik mit ratiometrischem Messverfahren mit Thermospannungskompensator
- Grenzwerte zur Gut- Schlecht- Sortierung
- SPS– und Ethernet- Schnittstelle
- Kurze Messzeit von ca. 50 ms / Messstelle
Description
The instrument LRT 640 is used to measure small electric resistors in production lines, e. g. fuses.
The LRT 640 has a PLC-interface to be integrated into the sequencing of the production as well as an Ethernet-interface to acquire the production data.
The instrument measures up to 4 resistors of the same kind simultaneously.
A measurement can be started via PLC or pushing the start-button. Every activated measuring point is measured in the following way:
Contact test: The resistance of the cable and the contact resistance of Rx are measured using a test current of approx. 100 mA.
Zero measurement: During the idle state (no current) thermo-electric voltages may occur and affect the resistance test. Therefore a reference value is determined to correct the measurement results if necessary.
Resistance test: The measurement current (0.5 A) through the DUT and the RREF is turned on and the resistance value is determined out of the ratio of the voltages (ratio metric measuring).
The result is compared to the minimum and the maximum value and a “good”/”fail”-decision is made. Every measuring point has its own LED lamps to show the “good”/”fail”-result.