Abstract: An infrared leak detector for detecting gas leaks in a pressurized gas source includes a housing that contains a sampling chamber, an infrared emitter for emitting IR energy, a filter that allows IR energy in the range of approximately 7 to approximately 14 microns to pass therethrough, a sensor that detects IR energy that has passed through the single filter to detect the presence of selected gas constituents in the gas sample, and a pump arranged to force a gas sample from a suspected gas leak that emanates from the pressurized gas source though the sampling chamber.

Abstract: Providing strain relief for a test lead comprises passing the test lead through a housing that includes a generally elongate tubular member having a longitudinal cavity therein for retaining the test lead and maintaining a connection between the test lead and an electrical probe. A plurality of slots is formed in sidewall portions of the tubular member near an end thereof to provide flexibility, thereby providing strain relief for the test lead.

Abstract: An electronic test instrument in the form of a clamp meter has a non-contact voltage sensing circuit which includes a blade and sensor built into the clamp. The test instrument also has a shaker circuit that produces a tactile vibration in the presence of an AC voltage. The intensity of the vibration is proportional to the level of the AC voltage. A clean power indicator circuit is provided as well. The clean power circuit compares the level of harmonic distortion plus noise to the full signal and activates an LED if the distortion plus noise is within acceptable limits.

Abstract: An electronic test instrument in the form of a clamp meter has a non-contact voltage sensing circuit which includes a blade and sensor built into the clamp. The test instrument also has a shaker circuit that produces a tactile vibration in the presence of an AC voltage. The intensity of the vibration is proportional to the level of the AC voltage. A clean power indicator circuit is provided as well. The clean power circuit compares the level of harmonic distortion plus noise to the full signal and activates an LED if the distortion plus noise is within acceptable limits.