Characteristics and Application Scenarios of High Voltage Passive Probe of Oscilloscope

ETA5260A is the flagship model of the ETA series of passive high voltage probes, designed for high voltage single-ended ground measurement scenarios. The product relies on the principle of high-precision resistance-capacitance voltage division, with a precise attenuation ratio of 1000:1, attenuates the highest 60kV high-voltage signal to the safe measurement range of the oscilloscope, and can clearly capture various high-voltage waveforms. The equipment only supports single-ended ground-to-ground high-voltage measurement, not suitable for floating-ground differential voltage test scenarios, with ultra-high withstand voltage, stable performance and power-free design, widely adapted to new energy, industrial power, scientific research laboratories and other fields of high-voltage testing needs.

一、 Core product advantages

1. Ultra-high withstand voltage level, full safety protection

Products strictly follow the EN61010-031 CAT II safety protection standards, excellent electrical parameters, the maximum support DC AC peak 60kV, AC effective value 42kV high voltage measurement. Sufficient withstand voltage margin can perfectly cover most high-voltage test scenarios such as photovoltaic energy storage system, vehicle-mounted 800V high-voltage platform, industrial high-voltage equipment, scientific research pulse high-voltage, etc., and fully guarantee the personal safety of test equipment and operators.

2. Passive power-free, plug-and-play adaptation wide.

Passive hardware design, no external power supply equipment, through the BNC interface can be directly connected to the oscilloscope. Fully compatible with mainstream brand oscilloscope models such as Puyuan, Tektronix and Germany, with simple wiring and convenient operation, greatly improving test efficiency and adapting to various normal test scenarios.

3. Ultra-high input impedance, ultra-low circuit load interference

Equipped with 900MΩ ultra-high input resistor, the input capacitance is only pF, and the capacitance matching adjustable range is 10pF ~ 35pF. Significantly reduce the shunt effect and load disturbance on the measured high-voltage circuit, accurately retain the original waveform characteristics, especially suitable for accurate measurement of various types of high-resistance high-voltage circuits.

4. Broadband high-speed response, full scene waveform capture

It supports DC ~ 50MHz bandwidth measurement with a rise time as low as 7ns. It can stably collect various signals such as DC high voltage, power frequency AC, PWM modulation waveform, power device switching transient, pulse high voltage, etc., accurately capture instantaneous details such as voltage spikes and switching edges, and meet the requirements of dynamic waveform testing.

5. The structure is durable, cost-effective and easy to carry

The equipment has excellent ability to resist instantaneous pulse impact, can be adapted to continuous high voltage and short-term pulse high voltage test at the same time, and has a wide dynamic measurement range. The body size is 90 × 90 × 381mm, the weight is only 606g, and it is matched with an exclusive portable shockproof storage box, which is convenient to store and carry. Compared with high-end active differential probes, while meeting the needs of high-voltage testing, it greatly reduces the cost of equipment procurement and has a significant cost-effective advantage.

二、Adapt to application scenarios

1. New Energy Power Electronics Testing

Suitable for high-voltage bus and DC side waveform detection of photovoltaic and energy storage inverters; On-board 800V high-voltage platform, on-board OBC, DCDC converter high-voltage waveform acquisition to ground; At the same time, it can meet the high-voltage test requirements of UPS power supply, high-voltage power supply module, electronic ballast and other equipment.

Scenario tip: 60kV ultra-high withstand voltage provides sufficient safety margin and is fully adapted to normal measurement of new energy high-voltage bus. If you need to capture the ultra-high-speed switching peak (>50MHz) of SiC/GaN power devices, you should pay attention to the upper limit of equipment bandwidth.

2. ulse high voltage and special power supply test

It can accurately capture the waveform of piezoelectric ceramic high-voltage pulse and ESD electrostatic discharge, and record the output signal of high-voltage pulse power supply. It is widely used in universities and scientific research laboratories to complete the high-voltage measurement experiment of plasma discharge, high-voltage pulse generator, pulse laser power supply and other equipment.

Scenario tip: 60kV peak pulse withstand voltage is suitable for all kinds of pulse and electrostatic test scenarios. When using, it is necessary to strictly follow the high-voltage loading duration specification to ensure test stability and equipment life.

3. Industrial High Voltage and Power R & D Testing

Suitable for high-voltage rectifier circuit, high-voltage generator, high-voltage capacitor charging and discharging waveform observation; It can accurately detect power frequency high voltage, power grid harmonics, voltage flicker and other power parameters to meet the needs of industrial high-voltage equipment research and development, debugging and quality inspection.

Scenario tip: low-and medium-frequency signals such as power frequency and harmonics are fully adapted to the 50MHz bandwidth range, with 900MΩ high input impedance, taking into account test safety and measurement accuracy.

4. Teaching and Laboratory Demonstration in Colleges and Universities

It is specially designed for high-voltage test bench, electrical insulation experiment and high-voltage principle teaching scene in colleges and universities. It can directly observe AC and DC high-voltage dynamic waveforms to help teaching and scientific research, experimental demonstration and course training.

Scene Tip: Relying on CAT II safety insulation standard, with portable shockproof storage design, taking into account experimental safety, equipment protection and convenient movement, it is suitable for normal teaching scenes in various laboratories.

三、Not suitable for use scenario

1. Floating differential voltage measurement scenarios (such as floating half-bridge upper and lower tube differential pressure measurement), such scenarios need to replace the special differential probe;

2. Ultra-high frequency and high voltage test scenarios with signal frequency> 50MHz;

3. Measurement of internal main circuit of CAT‑ III power distribution cabinet (the product is CAT II safety level, not suitable for high-risk working condition of distribution bus)；

4. Accurate test scenarios that require extraction of high-voltage superimposed weak and small signals (1000-fold attenuation will reduce the signal-to-noise ratio of weak signals and cannot accurately restore details).