VTHR Voltage Transducer

The VTHR voltage transducers convert dc or ac voltage to an isolated voltage or current loop output. The Available VTHR model cover the range from 50mV to 500Vrms, operation with a fast response capability. VTHR sensors are available in ac only or dc + ac configurations. The Model VTHR offers true RMS conversion DC-10kHz.

The sensor power input is designed to operate over a wide range associated with process control and sun-station auxiliary dc supply systems. Some typical applications are voltage monitoring in dc drives, process control, rail transpiration and circuit breaker trip coils. For all products, a NIST/NPL/UKAS traceable calibration certificate of conformance are available.

Safety and good working practice when using the VTHR and voltage transducers

1. Ensure that all personnel connecting and configuring the VTHR are fully trained and conversant with electric shock and fire hazards associated with electricity supplies
2. Ensure the circuit under test is switched off and isolated before connection
3. Only use safety type cables for connections to the VTHR probe. These cables are typically fitted with a 4mm safety type banana connector on either end. All connections should be insulated to prevent human contact
4. Ensure that the VTHR output (lo terminal) is connected to a grounded point on the scope/data logger/measurement system. 5. Ensure it is a true ground and not just signal low
5. Ensure that the maximum differential input voltage of (1000Vpk) and input voltage to ground (1000Vpk) are not exceeded
6. Users should always work in pairs, both parties should be trained and familiar with medical procedures in the event of electric shock
7. Ensure the circuit test is protected with over current protection
8. During installation, avoid all mechanical stress to the VTHR probe terminals
9. Do not use the probe with the case open Ensure that the storage and operating conditions are clean and dry, do not use where there is risk of explosion