Fluke 225C User Manual - Page 155
Profibus PA/31.25 kBits/s., When planning tests on this bustype, make
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Fluke 19xC-2x5C Users Manual Profibus PA/31.25 kBits/s. Profibus PA (Process Automation) is optimized for process control with focus on explosion safety. The wires are marked Data + and Data - and carry a DC supply with superimposed data. Additionally there are wires with DC power only. Data traffic is continuous. To check this bustype, ScopeMeter Channel A is on and alternately AC coupled for data or DC coupled to test the DC supply. The recommended probe is the Fluke 10:1 probe. Connect the probe as shown below. DATA + DATA - The figures below show some connector types. A D B C Connector acc. IEC61158-2 for harsh environment (fixed device side, male contacts) A: Data + and Power B: Data - and Power C: Optional Power + D: Optional Power - Warning When planning tests on this bustype, make sure the proper safety rules are adhered to! A-8