Optical probe Electric Current Sensor: OpECS

■ Ultra-small sensor head (Minimum Φ0.45mm)

■ Supports isolation current measurement

■ Wide Bandwidth DC ～ 150MHz

■ Measurable current ±140A

■ Available on oscilloscopes with 50Ω BNC input

About OpECS

OpECS is an optical probe current sensor that enables current measurement by capturing the magnetic field generated around the current through the Faraday effect.

OpECS Working Principle

When a magnetic field exists at the sensor head, the linearly polarized light is affected by the magnetic field and its oscillation direction changes. The direction of oscillation follows an elliptical orbit according to the direction of the magnetic field, and the change in direction is proportional to the magnitude of the magnetic field. The elliptically polarized light information is sent to the main unit (control unit) at the latter stage, where it is converted from an optical signal to an electrical signal. This signal can be input to an oscilloscope or other device equipped with a 50Ω-terminated BNC connector to measure the current.

Sensitivity and measuring current range of OpECS

Positional relation between wire and sensor
Maximum sensitivity is obtained when the sensing element is in contact with the center of the wire, as shown in ① in the lower left figure. For the direction of the current flowing through the wire, a positive output is obtained when placed as in ①, and an inverted output is obtained when placed as in ②. When the sensor is away from the center of the wire as shown in ③, the magnetic field weakens and the sensitivity changes as shown in the lower right figure. Therefore, by placing the sensor at a suitable distance, it is possible to measure a current that correlates to a much greater wire-current. Indirectly, currents greater than the max current can be measured this way.

Sensitivity over Distance

Sensitivity as a function of the distance between sensing element and the center of the wire. The magnetic field weakens and the sensitivity drops with increasing distance.

Wire diameter and sensitivity

If the distance between the center of the sire and the sensor is constant, the sensitivity does not change even if the wire diameter is changed, as shown in the figure below.

OpECS Models and Specifications

Sensors are not included.

The 'Measurable Current' depends on the distance between the sensor and the center of the wire, measurements exceeding the measurable currents listed at left can also be performed.

* Measured by contacting a Φ0.5mm copper wire

** Can also be used with oscilloscopes with 1MΩ input by using 50Ω feed-through terminations

			Article number	Bandwidth (-3dB)	Measurable Current	Sensitivity	Output Voltage	Noise	Linearity	Output Connector
Price available upon request Lead time 8-10 weeks		Datasheet	OTB-11120-00	DC ～ 150MHz (-3dB)	±140A *	25.78 mV/A * (0.073 mV/A・m-1)	±4.7V	6.3 mVrms	±1% *	BNC

OpECS Sensor Models and Specifications

The following two items are required.
■ OpECS main unit (Control unit)
■ Sensor head (Choice of 3 types below)

		Article number	Description
Price available upon request Lead time 8-10 weeks	Datasheet	SOG-A-003-008-00	OpECS Horizontal type sensor head
Price available upon request Lead time 8-10 weeks	Datasheet	SOG-A-003-065-00	OpECS Guided Vertical Head
Price available upon request Lead time 8-10 weeks	Datasheet	SOG-A-003-056-00	OpECS IC Clip Head

OpECS

Name: OpECS Main Unit/ OpECS optical probe current sensor unit, sensor head required and to be ordered separately
Brand: PMK America Corporation
SKU: OTB-11120-00
Price: 76380.00 USD
Availability: InStock