AC/DC Split Core Current Sensor CT1000S

This AC/DC split core current sensor is designed for measuring large DC and AC currents in applications such as electric vehicles, renewable energy systems, inverters, and motors. It facilitates high-current measurements by clamping around existing current connections. With its voltage output, this sensor is compatible with power analyzers (WT series and PX8000) and waveform measurement instruments (ScopeCorders and DLM series), making it a versatile tool for various high-current measurements.

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.

Measure large currents with high precision without cutting the measurement cable

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
8:Cable length
  Select from 3m, 5m, 10m


Conductor position adjuster

CT1000s with measurement cable

When using a current sensor, the conductor's position can impact measurement accuracy. This effect can be minimized by securing the cable in the center of the sensor's feed-through hole. A 30 mm diameter jig is included as a standard accessory with the CT1000S to secure the conductor's position. This accessory stabilizes the target cable, reducing measurement variations and ensuring high-accuracy current measurements regardless of the cable diameter.

AC/DC split core current sensor mounting

The CT1000S features six M4 screw holes on the main body for mounting. By preventing sensor misalignment and maintaining consistent measurement conditions, this improves measurement repeatability.

  CT1000S CT1000A CT1000 701931
Model name CT1000S CT1000A CT1000 701931*
Rated current 1000Arms 1000Arms 1000Apeak 500Arms
Accuracy(50/60Hz) ±(0.2% of rdg +0.01% of f.s.) ±(0.04% of rdg + 30μA) ±(0.05% of rdg + 30μA) 〜500A:±1% of reading ±5mV
500A〜700Apeak:±2% of reading(Amplitude accuracy)
Bandwidth(-3㏈) DC~300kHz DC~2MHz
Operating humidity range Main unit:-40℃〜85℃
Sub unit:5℃〜40℃
IV unit:5℃〜40℃
-40℃〜85℃ 10℃〜50℃ 0℃〜40℃
Operating temperature range 20℃〜80% RH
(no condensation)
(no condensation)
Main unit:190×153×52
Sub unit:177.5×33×41
IV unit:60×24×40
128×106×54 128×106×60 Sensor:176×69×27
Primary current hole diameter φ52mm φ38.2mm φ30mm φ20mm
Supply voltage ±12V ±15V ±15V ±12V
Supply current ±0.8A(Maximum) Approx.(120mA+output current) Aoorix(150mA+output current) 580mA(Maximum)
Output 2mV/A Primary rated current at 1000A is 666.6mA 0.01V/A
Connector type BNC D-sub 9 pin BNC

*For waveform measurement


Compatibile Configurations with Measurement Instruments

The CT1000S 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.

Pairings of Measurement Instruments and Power Sources with the CT1000S

Examples of instrument and power supply combinations when using an AC/DC split core current sensor

Number of available sensors for each power supply

  CT1000S Power supply and usable number
Model 760903 PX8000
/P2, /P4
/P4, /P8
Rated current ±12 V
±0.8 A
±12 V
4 ch total
±12 V
±2.4 A
4 ch total
±12 V
±2.4 A×2
4 ch total × 2
±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
*±0.8 A (Maximum supply)

×1 ×1 ×3 ×3
×1 ×2 ×3



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.


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