High voltage test probes should not be used for measurements in which application?

High voltage test probes are designed primarily for measuring voltages in safe and controlled environments. Using them in applications like broadcast transmitters, high voltage power distribution systems, and induction-type heaters poses significant risks due to the nature of these applications.

In broadcast transmitters, the high energy levels and potential interference may lead to inaccurate measurements or equipment damage. For high voltage power distribution systems, there are serious safety concerns, such as the risk of electrical arcing or shock to the operator, which makes it hazardous to use high voltage probes in those environments. Similarly, induction-type heaters operate at high frequencies and power levels that can induce unwanted voltages or even damage the probes.

Since all three applications entail high voltage elements where safety and measurement integrity are paramount, high voltage test probes should not be employed in any of these scenarios, making the option that includes all of them the most appropriate choice.