What is the variability allowed for timer accuracy in exposures less than 10 milliseconds?

The variability allowed for timer accuracy in exposures less than 10 milliseconds is 20%. This standard is established to accommodate the inherent limitations in measuring very short time intervals accurately. In radiographic practice, the precision of timing devices is critical, especially at such short exposures where even a few milliseconds can significantly impact the overall image quality and radiation dose delivered to the patient.

Setting a variability allowance of 20% for exposures under 10 milliseconds reflects the understanding that while precision is essential, practical limitations in measurement tools and techniques may affect the accuracy attainable in these short ranges. This tolerance ensures that while striving for optimal performance, we acknowledge and accept certain degrees of variability inherent in operations involving rapid exposures, which helps maintain a balance between operational feasibility and quality control standards.