Function Test on a 9 5/8 inch PDM (Positive Displacement Motor) drill bit assembly, the objective is to ensure that all downhole components — especially the PDM and bit — are functioning properly before drilling resumes. Here’s a breakdown of why the function test is important and how it’s performed: Perform a Function Test on a 9 5/8 inch PDM Drill Bit 1. Ensure Downhole Tool Integrity: After tripping in hole or making up a new BHA (Bottom Hole Assembly), it is critical to verify that the motor