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Inverters used in rail and power system applications convert high-voltage power. To measure the efficiency of such conversions, it’s necessary to measure voltages of 1000 V and above. The VT1005 divides voltages of up to 5000 V and outputs them to a power analyzer. In order to measure the efficiency of high-efficiency inverters with a high degree of precision, you need to be able to accurately measure power from DC to high frequencies.
Inverters used in rail and power system applications convert high-voltage power. To measure the efficiency of such conversions, it’s necessary to measure voltages of 1000 V and above. The VT1005 divides voltages of up to 5000 V and outputs them to a power analyzer. In order to measure the efficiency of high-efficiency inverters with a high degree of precision, you need to be able to accurately measure power from DC to high frequencies.
Thanks to its excellent frequency flatness, the VT1005 makes possible accurate measurement at frequencies ranging from the fundamental wave to switching-frequency components.
Features
The VT1005 can measure voltage with excellent accuracy across a broad band of frequencies. Accuracy is 0.1% or less at DC and commercial frequencies (50/60 Hz). In addition, the device can measure the most commonly used switching frequencies (10 kHz or less) and the switching frequencies of inverters that use SiC power devices (from 10 kHz to 50 kHz) with a high degree of accuracy.
High-voltage differential probes have a broad frequency band, but measurement error on the order of several percent occurs within that band. Thanks to high accuracy and excellent frequency flatness within its frequency band, the VT1005 makes it possible to detect efficiency improvement effects on the order of 0.1%, a task that has been impossible until now.
The VT1005 is highly resistant to both common-mode and high-frequency noise, allowing it to measure voltage accurately even in noisy environments. Since conversion devices like inverters are sources of noise, noise resistance is important in efficiency evaluation.
| Maximum rated voltage | 5000 V rms, ±7100 V peak (*1) |
| Maximum rated voltage (line-to-ground) | No measurement category: 5000 V AC/DC (*2) Measurement category II: 2000 V AC/DC (*3) Measurement category III: 1500 V AC/DC (*4) |
| Voltage dividing ratio | 1000：1 |
| Measurement accuracy | ±0.08％(DC), ±0.04％(50/60 Hz), ±0.17% (50 kHz) |
| Frequency flatness | Band where amplitude falls within ±0.1% range: 200 kHz (typical) Band where phase falls within ±0.1° range: 500 kHz (typical) (*5) |
| Measurement bandwidth | DC to 4 MHz (Amplitude and phase accuracy specified up to 1 MHz) |
| Common-mode voltage | 50 Hz/60 Hz: 90 dB（Typical） |
| rejection ratio (CMRR) | 100 kHz: 80 dB (Typical） |
| Measurement method | Differential input |
| Operating temperature and humidity range | -10°C to 50°C (14°F to 122°F), 80% RH or less (non-condensing) |
| Storage temperature and humidity range | −20°C to 60°C (-4°F to 140°F), 80% RH or less (non-condensing) |
| Standards | Safety: EN 61010 EMC: EN 61326 Class A |
| Power supply | 100 V to 240 V AC (50/60 Hz) |
| Dimensions and Weight | Approx. 195.0 mm (7.68 in) W × 83.2 mm (3.28 in) H × 346.0 mm (13.62 in) D mm Approx. 2.2 kg (77.6 oz.) |
| Maximum rated voltage | 5000 V rms, ±7100 V peak (*1) |
| Maximum rated voltage (line-to-ground) | No measurement category: 5000 V AC/DC (*2) Measurement category II: 2000 V AC/DC (*3) Measurement category III: 1500 V AC/DC (*4) |
| Voltage dividing ratio | 1000：1 |
| Measurement accuracy | ±0.08％(DC), ±0.04％(50/60 Hz), ±0.17% (50 kHz) |
| Frequency flatness | Band where amplitude falls within ±0.1% range: 200 kHz (typical) Band where phase falls within ±0.1° range: 500 kHz (typical) (*5) |
| Measurement bandwidth | DC to 4 MHz (Amplitude and phase accuracy specified up to 1 MHz) |
| Common-mode voltage | 50 Hz/60 Hz: 90 dB（Typical） |
| rejection ratio (CMRR) | 100 kHz: 80 dB (Typical） |
| Measurement method | Differential input |
| Operating temperature and humidity range | -10°C to 50°C (14°F to 122°F), 80% RH or less (non-condensing) |
| Storage temperature and humidity range | −20°C to 60°C (-4°F to 140°F), 80% RH or less (non-condensing) |
| Standards | Safety: EN 61010 EMC: EN 61326 Class A |
| Power supply | 100 V to 240 V AC (50/60 Hz) |
| Dimensions and Weight | Approx. 195.0 mm (7.68 in) W × 83.2 mm (3.28 in) H × 346.0 mm (13.62 in) D mm Approx. 2.2 kg (77.6 oz.) |
