S14-09 Load Box Verification Tool

This load box is based on Ohm’s law. Custom high-quality standard resistors are installed as follows:

• The line to the Ground blade (R1)
• Neutral to Ground blade (R2)
• Binding post to Line (R3)
• Binding post to Neutral (R4)

The installation configuration applies to the Pass (Green) and Fail (Red) terminals on the S14-09 load box. With this setup, the operator can perform the verification test under these four test conditions:

• Normal Polarity Earth Leakage (R1)
• Reverse Polarity Earth Leakage (R2)
• Normal Polarity Enclosure or Patient Leakage (R3)
• Reverse Polarity Enclosure or Patient Leakage (R4)

The S14-09 will check the functionality of the safety analyzer for an earth leakage current test and enclosure or patient leakage current tests.

A typical leakage current test is performed at 110% Mains voltage. For North America this is 132V. According to IEC 60601-1 the specified earth leakage current limit for normal conditions is 0.5mA.

Using custom resistors based on the voltage requirement and high limit specification, the load box can produce a specific leakage current to determine whether or not a tester is functioning properly. If the tester is not outputting the correct voltage the desired current will not be produced, resulting in the detection of a problem.