What scale should an analog meter be set to when checking a grounded motor?

When checking a grounded motor, it is important to use the appropriate scale on an analog meter to ensure accurate readings of the resistance. Setting the meter to the Rx10k scale is ideal because it allows for the measurement of higher resistances that could be present in a motor's windings, as well as highlighting any potential grounding issues.

Motors typically have windings that may exhibit resistance levels in the kilo-ohm range. By using the Rx10k scale, the meter can effectively capture these readings without overwhelming the meter's capacity, which could happen if a lower scale were used. Additionally, this scale enhances the sensitivity of the measurement, helping technicians to detect subtle variations in resistance indicative of grounding problems.

Using other scales, such as Rx1 or Rx100, would not provide the necessary resolution for the typical resistance values found in motors, potentially leading to inaccurate assessments or missed troubleshooting opportunities. Therefore, selecting the Rx10k scale is critical in evaluating the integrity and grounding of motor windings properly.