The HVcompact is a digital high voltage meter with an auto-ranging oscilloscope and a meter display for the measured voltage values. In addition to the measured high voltage (U DC), the instrument displays derived and additional measurement values, such as Û, Û/√2, U RMS, crest factor, and measurement frequency. Either U DC, Û, Û/√2, or U RMS can be displayed using large characters to improve the readability.
The HVcompact is a good choice for laboratory use and material testing (quality assurance) of:
- Instrument, current, and voltage transformers
- High voltage and medium voltage cables
- Switchgears
With a maximum input voltage of ~100 V RMS and an adjustable divider ratio, the HVcompact can easily be matched to your specific test setup.
Further, the unit offers the monitoring of a voltage limit and the indication of a voltage breakdown. The analysis of a breakdown is simplified, as the voltage history of the last minutes before such an event is stored in a non-volatile memory.
The HVcompact is equipped with a USB serial interface on the front for the connection of the instrument to a PC with software that monitors the voltage along with partial discharge readings, for instance.
The rear panel of the HVcompact shows the connections for the power supply, the voltage input (BNC), the earthing wing nut, the relay connector, the recorder output (BNC), the COM (TTL) connector, and optionally a LAN and/or RS‑232 link.
In order to avoid that a test specimen is stressed above its allowable voltage, the instrument setup allows to define a voltage limit for the measurement. In case the test voltage exceeds this limit, the HVcompact can trip an external relay, which can, i.e., block the ‘UP’ button of the control circuit or disconnect the main circuit breaker. Additionally, the instrument can predict an incipient breakdown or a flashover by detecting even very small voltage drops in advance of such a failure. Therefore, a maximum permissible voltage change per second (dU/dt) can be set. If this value is exceeded the instrument automatically stops the test to protect the specimen from being damaged.
Key features of the HVcompact are:
- Two display modes: Needle meter and oscilloscope
- Safety features to detect incipient breakdowns and flashovers
- Relay output for signal transfer to external test controls
- Recorder output for voltage signals from 0 to 10 V
- Calibrated in our DAkkS-accredited laboratory which is certified according to ISO 17025:2018
- Two housing versions: Rack-mountable 19-inch housing or half 19-inch desktop housing for tabletop operation
To adapt the instrument to your test environment it can be equipped with:
- An optional LAN interface
- An optional connector for a fibre optic serial link (RS-232 interface)
- The optional automation software HVpilot
