AC/DC Split Core Current Sensor CT500SA/ CT200SA
The Yokogawa CT200SA and CT500SA AC/DC Split-Core Current Sensors deliver high-accuracy current measurement in a compact design for confined spaces. Their split-core construction enables measurements around existing conductors without disconnecting wiring, simplifying test setup for electric vehicles, inverters, motors, and renewable energy systems.
Using fluxgate technology, the sensors provide accurate AC and DC current measurements with excellent noise immunity. With rated currents of 200 A and 500 A, bandwidths up to 1 MHz, and compatibility with Yokogawa power analyzers and waveform measurement instruments, they support demanding power and efficiency measurement applications.
With its voltage output, this sensor is compatible not only with power analyzers (WT series) but also withwaveform measurement instruments (ScopeCorders and DLM series).
Accurately Measure Large Currents Without Rewiring
This split core current sensor offers superior noise immunity, providing stable measurement of large currents over a wide bandwidth.
Main Unit
1：Lock lever
Sub unit
2：Power LED
3：Overcurrent LED
4：Demag button
5：Offset adjust knob
IV unit
6：Output connector
Power supply
7：Power connector
Cable
8：Cable length
Select from 3m, 5m, 10m
The CT500SA and CT200SA are designed for measurements in confined spaces and can be operated with one hand. The main unit of the current sensor, which connects to the measurement target, is compact—about the size of the palm of your hand. Furthermore, the locking mechanism is designed so that it can be unlocked with a single finger, even when performing measurements in tight spaces where both hands cannot fit.
In addition to development applications, the current sensor is designed to be secured during testing of finished products, taking into account the operation of the device being measured. Securing the sensor using the screw holes (M4) on the sensor body or cable ties prevents the measurement point from shifting. Using this securing feature improves measurement accuracy and reproducibility.
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| Model Name | CT200SA | CT500SA | CT1000S |
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| Rated current | 200 Arms | 500 Arms | 1000 Arms |
| Accuracy （50/60Hz） |
±（0.09% of reading ＋ 0.01% of full scale）* ±（0.1% of reading ＋ 0.01% of full scale） |
±（0.2% of rdg ＋0.01% of f.s.） | |
| Bandwidth （-3㏈） |
DC to 1 MHz | DC to 500 kHz | DC to 300 kHz |
| Operating temperature | Main unit:－40℃ to 85℃ Sub unit:5℃ to 40℃ IV unit:5℃ to 40℃ |
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| Operating Humidity | 20% to 80%RH below （no condensation） |
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| Dimensions （W×H×D）㎜ |
Main unit:110×62×25 Sub unit:177.5×33×41 IV unit:60×24×40 |
Main unit:190×153×52 Sub unit:177.5×33×41 IV unit:60×24×40 |
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| Measurable conductors | Φ20㎜ | Φ50㎜ | |
| Supply voltage | ±12V | ||
| Maximum supply current | ±0.7A（maximum） | ±0.8A（maximum） | ±0.8A（maximum） |
| Output voltage | 10 mV/A | 4 mV/A | 2 mV/A |
| Connector type | BNC | ||
| * Under the following temperature conditions Main unit: 23 °C ± 5 °C, sub-unit: 23 °C ± 5 °C, IV unit: 23 °C ± 5 °C |
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Compatibile Configurations with Measurement Instruments
The CT500SA/ CT200SA is compatible with various power analyzers and waveform measurement instruments. To operate the current sensor, a power supply is necessary. You can utilize the power supply option available on the measuring instrument, or connect an external power supply. It's important to note that depending on the power supply type, there may be a maximum limit to the number of current sensors that can be operated with a single power supply. Please refer to the list below for the specific number of sensors that can be used.
Pairing with the WT1800R
The 761961 Power Adapter for Current Sensor allows the optional power supply (/PD2) of the Precision Power Analyzer WT1800R to supply power to the Split core current sensor. Up to six Split core current sensor can be used with a single WT1800R. This eliminates the need for an external probe power supply, resulting in less and simple wiring, and integrating the instrument with the power supply suppresses noise and ensures reliable measurements even in harsh noise environments.
Connection of the WT1800R and the Split core current sensor*1
761961 Power Adapter for Current Sensor
*1: 761961 Power Adapter for Current Sensor is used. /PD2 option and /EX1 to /EX6 options must be installed in the WT1800R.
Number of available sensors for each power supply
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| Model | 760903 | PX8000 /P4 |
WT1500 |
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| Rated current | ±12 V ±0.8 A |
±12 V ±1A 4 ch total |
±12 V ±0.8 A (1 ch) |
| Number of CT1000S available *±0.8 A (Maximum supply) |
×1 | ×1 | ×4 |
| Number of CT500SA available *±0.8 A (Maximum supply) |
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| Number of CT200SA available *±0.7 A (Maximum supply) |
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| Model | DL950 /P4 |
DL950 /P8 |
SL2000 /P4, /P8 |
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| Rated current | ±12 V, ±2.4 A, 4 ch total | ±12 V, ±2.4 A × 2, 4 ch total × 2 | ±12 V, ±2.4 A × 2, 4 ch total × 2 |
| Number of CT1000S available *±0.8 A (Maximum supply) |
×3 | ×3 ×3 |
×3 ×3 |
| Number of CT500SA available *±0.8 A (Maximum supply) |
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| Number of CT200SA available *±0.7 A (Maximum supply) |
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| Model | DLM3000 /P4, /P8 |
DLM5000HD/DLM5000 /P4, /P8 |
701934 |
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| Rated current | ±12 V, ±1.2 A, 4 ch total | ±12 V, ±2.0 A, 8 ch total | ±12 V, ±2.5 A, 4 ch total |
| Number of CT1000S available *±0.8 A (Maximum supply) |
×1 | ×2 | ×3 |
| Number of CT500SA available *±0.8 A (Maximum supply) |
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| Number of CT200SA available *±0.7 A (Maximum supply) |
A comprehensive review of split core current transformers and explanation of their principles of operation, design considerations, advantages, disadvantages compared to other CT technologies, and applications.
Designing an instrumentation system for high current measurement requires careful consideration of the trade-offs associated with each type of sensing device. The purpose of this application note is to help engineers understand the sensing choices available and the corresponding trade-offs with each technology.
In this application note you will learn when and how to use different methods to connect a current transformer to a power analyzer.
