Hioki pull-through current sensors and clamp on current probes are best-in-class current sensing devices for use with power meters, Memory HiCorders and high performance oscilloscopes. The CT9555 is 1-channel sensor unit and power adapter for any of the CT686x series, 9709 and CT684x series current sensors and probes that provides waveform output
The Sensor Unit CT9555 Series are power supplies for high-precision current sensors with waveform output functionality. In addition to serving as a four-channel power supply, the CT9557 can also output a single waveform from an aggregate of input waveforms.
Measuring large currents and multi-cable circuits with sum functionality
![]()
Once a current sensor has been attached to each branch cable, the CT9557 adds the sensor signals together to create a total signal. Since the device can treat multiple sensors as a single sensor, as illustrated in the figure above, the current can be measured using a single power meter.
Using a data logger to perform high-precision current measurement
![]()
In this setup, waveform output is monitored on the DC current side, and RMS output is monitored on the AC current side of the circuit. Even a logger that lacks RMS conversion functionality can be used to measure AC current. A wireless logger can also be used. If a high-precision voltmeter is used, both the AC and DC currents can be measured with a high degree of precision.