Hioki Launches Two New High Precision AC/DC Current Probes

Hioki E.E. Corporation is pleased to announce the launch of the AC/DC Current Probe CT6841 (20 A AC/DC rated current) and the AC/DC Current Probe CT6843 (200 A AC/DC rated current) for high precision testing applications particularly in the electric vehicle and hybrid vehicle markets.

The new clamp sensors are engineered to meet demand for the ability to measure current at a high level of precision across a broad range of temperatures in the development of products such as electric vehicles.

Development Background

During development of electric and hybrid vehicles, the need to evaluate motor efficiency requires engineers to measure current flowing in wiring inside the engine compartment at a high level of precision. However, since wiring cannot be removed easily when measuring current in actual vehicles, pass-through current sensors cannot be used. Further complicating the task are high temperatures and a lack of space in the compartment, which houses both the engine and a complex network of wiring. These conditions demand compact, high-precision current sensors that can make measurements in a broad range of temperatures. Hioki''s newly launched CT6841 and CT6843 AC/DC Current Probes meet this measurement need.

Principal Applications

* Evaluation of electric vehicle and hybrid vehicle motor efficiency

(Measuring current inside an engine compartment)

* Evaluation of the efficiency of inverters and power conditioners used in solar power systems

Product Features

1. Ability to make high-precision measurements across a broader range of temperatures than legacy models

Compared to Models 9277 and 9278, both the CT6841 and CT6843 can measure current across a broad frequency band at a high degree of precision. Furthermore, they both feature an operating temperature range of -40C to 85C, allowing their use in a broader range of temperatures than legacy models with a 0C to 40C range. This capability allows the instruments to be used to measure current inside hot engine compartments. Additionally, the new sensors are less susceptible to the effects of noise from nearby wiring than legacy models, allowing more accurate measurement.