IP520 非接触式电流探头
概述
观察和测量PCB线路中的电流
通过非接触式探测进行测量
适用于观察和测量元件引线和接地平面以及PCB线路的电流
宽动态范围10mA至20A pk到pk
DC至5MHz的宽带宽
在全带宽下相当于< 6mA rms的低噪声
通过极低的插入阻抗和杂散电容对电路条件的干扰最小
安全额定值300V Cat II (600V Cat I)
适合连接到任何示波器
高精度通用h型场探头
转换为标准的“封闭磁性ci”
指标
| I-Prober 520 current probe Specifications | |||
|
Output Signal |
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| Maximum Output: | 10V | ||
| Oscilloscope Inputs: | Suitable for an input impedance of 1MΩ in parallel with < 30pF | ||
| Trace Position: | Wide range DC offset control within signal conditioner | ||
| Safety | |||
| Max. Circuit Voltage: | 300V Cat II (on AC line circuits). 600V Cat 1 (on uncategorized circuits inside equipment) | ||
| Max. Tip Temperature: | 300V Cat II (on AC line circuits). 600V Cat 1 (on uncategorized circuits inside equipment) | ||
| Conformance: | Complies with EN61010-1 and EN61010-031 | ||
| Bandwidth Control | |||
| Switch Position: | Full | 500kHz | 2Hz |
| Nominal Bandwidth: | DC to 5MHz | DC to 500kHz | DC to 2Hz |
| Risetime: | < 70ns | 700ns | 175ns |
| Aberrations: | < ±5% | < ±1% | < ±1% |
| *This is the noise level for current measurement using the Toroid attachment. For PCB track measurement the equivalent noise will depend upon the track width and gain setting but will be similar to the Toroid measurement figure for a track width of 0.5mm. | |||
| HF Performance | |||
| Propagation Delay: | 60ns typical (to 10%) | ||
| Bandwidth: | DC to 5MHz (small signal) | ||
| Slew Rate: | DC to 5MHz (small signal) | ||
|
Overload Indication |
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| Indicator Threshold: | Indicator LED within signal conditioner will light if output voltage exceeds +/- 10V or if large magnetic fields cause the system to saturate | ||
| Power Source | |||
| Power Supply: | 5.2V at up to 5 watts from AC line adaptor (supplied) | ||
| Mechanical | |||
| Probe Dimensions: | 155mm x 38mm x 28mm max; 2.8mm x 1.8mm at tip | ||
| Cable Length: | 2m from probe tip to output BNC | ||
| EMC | |||
| Conformance: | Complies with EN61326 | ||
| Magnetic Field Measurement (Mode = Field) | |||
| Scaling Factor: | 250uT (or 200A/m) per Volt. | ||
| Accuracy and Linearity: | ±3% | ||
| Maximum Field: | ±2.5mT (2000A/m). | ||
| Current Measurement using Toroid (Mode = Wire) | |||
| Scaling Factor: | 1 Amp per Volt. | ||
| Accuracy and Linearity: | ±5% | ||
| Current Range: | ±10mA to +/-10A (DC + peak) | ||
| Max. Wire Diameter: | 3.5mm (unbroken) or 6mm (end fed) | ||
| Current Measurement in PCB Tracks (Mode = PCB Track) | |||
| Scaling Factor: | Adjustable to 1 Amp per Volt for track widths 0.2mm to 3.5mm (0.007" to 0.14") and 2 Amp per volt for track widths 3mm to 6.5mm (0.125" to 0.25") using Calibrator and compensation graph. | ||
| Sensor Spacing: | 0.7mm distance from sensor to PCB track set by probe design. | ||
| Calibrator: | Built-in calibrator within the signal conditioner providing an AC or DC calibration current through a 0.5mm track | ||
应用
| Using the I-Prober 520 non-contact current probe | |
| What's supplied? |
The I-Prober 520 consists of the current probe connected by 1.25 metres of cable to its signal conditioner. From there a further 0.5 metres of cable is terminated in a BNC connector for use with any normal oscilloscope. The probe is powered through the signal conditioner by a small universal-voltage ac adaptor. A clip on toroid assembly is also provided which converts the probe into a conventional "closed magnetic circuit" current probe for measurement of current in a wire |
| The Signal Conditioner |
The signal conditioner provides the choice of three modes of operation along with bandwidth filters, an offset control and overload indicator. It also incorporates the calibrator needed for measurement on PCB tracks of differing widths. |
| PCB track current measurement |
The unique feature of the I-Prober 520 is its ability to observe and measure currents flowing in PCB tracks by acting as a non-contact current probe. The magnitude of the signal is critically related to its position relative to the conductor which means that the probe tip must be positioned carefully. The size of the conductor (e.g. the width of a PCB track) also has a significant effect. This means that the sensitivity of the I-prober has to be adjusted to match the track width when quantitative measurements are required. A calibrator within the signal conditioner enables sensitivity adjustment in conjunction with a calibration graph. The measurement result will also include other field effects present at the tip of the probe and not just that coming from the current through the conductor. This may include DC effects from adjacent magnetised components and from the earths magnetic field, plus AC effects from transformers and other field radiating sources. Current in adjacent tracks, or tracks on the opposite side of the PCB will also affect the measurement. There are potential solutions to these problems. The unwanted DC can be nulled out by observing the measurement without power to the circuit, whilst AC interference can be attenuated using bandwidth filters. The I-prober signal conditioner includes a wide range DC offset control and switchable filters. Nevertheless, the use of the I-prober 520 requires interpretation based upon a proper understanding of circuits and systems. It is a tool for the professional engineer and is not suitable for use by just anyone. |
| Closed-loop current measurement (in a wire) |
The very small size of the field sensor within the I-prober 520 gives it some unique capabilities when used to measure magnetic fields. The variation of field with position can be accurately determined enabling the precise source of fields to be located and their variation in space measured. With the signal conditioner mode switch is set to Field the output voltage is rescaled to measure in Teslas or in amps per metre. |
| Measurement of electromagnetic field |
The very small size of the field sensor within the I-prober 520 gives it some unique capabilities when used to measure magnetic fields. The variation of field with position can be accurately determined enabling the precise source of fields to be located and their variation in space measured. With the signal conditioner mode switch is set to Field the output voltage is rescaled to measure in Teslas or in amps per metre. |
