- Maximum input voltage: 5 kVrms
- Bandwidth: DC to 4 MHz (–3 dB)
- Accuracy: ±0.08% (DC), ±0.04% (50/60 Hz)
- Phase flatness: ±0.1° up to 500 kHz
- CMRR: 80 dB at 100 kHz
- High-precision high-voltage measurement up to 5 kVrms, suitable for power analysis
- Maintains amplitude and phase accuracy up to 1 MHz
- High common-mode rejection (80 dB at 100 kHz) ensures stable measurements in noisy environments
Applications
- Loss measurement in high-voltage transformers, inductors, and coils
- Efficiency evaluation of SiC- and GaN-based high-voltage converters
- Evaluation of wireless power transfer (WPT) systems
- Power analysis in railway traction and industrial power systems
- Testing and verification of high-voltage solar inverters
The Hioki VT1005 is a high-precision AC/DC high-voltage divider designed for measuring signals up to 5 kVrms. It scales the input voltage by a fixed 1000:1 ratio and provides a scaled low-voltage signal via a BNC output for direct connection to power analyzers, memory recorders, oscilloscopes, or other instruments with BNC input.
The instrument delivers high accuracy across a wide frequency range: ±0.08% for DC and ±0.04% at 50/60 Hz, with amplitude flatness of ±0.1% up to 200 kHz and phase accuracy of ±0.1° up to 500 kHz. The flat frequency response enables precise power analysis even in fast-switching systems with significant harmonic content, supporting measurements up to 4 MHz (–3 dB).
Comparison with differential probes
Compared to conventional high-voltage differential probes, the VT1005 offers significantly higher accuracy. Differential probes typically provide around 2% amplitude accuracy and often do not specify phase accuracy, limiting their use in precise power measurements, especially in PWM-based systems such as DC/DC converters and drive inverters.
The VT1005 is designed for accurate AC/DC voltage measurement with well-defined amplitude and phase specifications, making it suitable for these demanding applications.
Passive design for stable measurement results
The passive architecture eliminates issues commonly associated with active differential probes, such as probe loading, thermal drift, and active circuit noise. This results in cleaner signals, higher accuracy, and stable measurement performance over time, even at higher frequencies.
With a common-mode rejection ratio of 80 dB at 100 kHz, measurement integrity is maintained even in electromagnetically noisy environments such as inverter test benches and industrial power systems.
Thanks to its accuracy, wide bandwidth, and noise immunity, the VT1005 is well suited for loss measurement in high-voltage components, efficiency analysis of power electronics, and characterization of wireless power transfer systems.
Included
- VT1005 high-voltage divider
- L1050-01 high-voltage cords, 1.5 m
- L9217 BNC cable
- 9704 BNC to banana adapter
- Power cord
- Instruction manual