CT7631 - AC/DC Current Probe

Key Specifications2 isolated analog channels with BNC inputs 1 MS/s sampling rate, 12 bit resolution, DC to 50 kHz bandwidth RMS data logging with up to 1000 values per second Voltage measurement: 100 mV to 500 V, 12 ranges2 MWords internal memory per channel, removable memory card storage Typical ApplicationsCapture voltage drops, spikes, and transient power issuesDetect short voltage or current deviations over long periods using RMS logging Record inrush currents and motor control timing Diagnose PLC, relay, and control signal behavior Detailed Product OverviewThe MR8870 Memory Recorder is a compact, handheld data acquisition system designed for technicians and engineers who require high-speed, isolated waveform capture in the field. When configured as an RMS Recorder, the MR8870 calculates up to 1000 RMS values per second, allowing short voltage or current deviations to be detected even during extended monitoring. Equipped with two isolated analog channels with BNC inputs and four logic channels, the MR8870 enables simultaneous measurement of analog waveforms and digital signals. Each analog input supports direct voltage measurement up to 400 VDC and is isolated from earth up to 300 VAC/DC in CAT II environments.Waveform recording and RMS loggingThe MR8870 records waveforms with a maximum sampling rate of 1 MS/s, 12-bit vertical resolution and a bandwidth of DC to 50 kHz. Configurable trigger functions with adjustable pre-trigger settings allow event-based recording aligned with the measurement task, for example when capturing voltage or current transients, inrush currents or relay dropouts. When configured as an RMS Recorder, the MR8870 calculates up to 1000 RMS values per second based on high resolution sampling. This enables detection of short duration voltage or current deviations during extended monitoring periods without averaging them out. RMS values can be stored at user defined intervals together with minimum and maximum values for each interval. Current measurement with external sensors The MR8870 also measures current using external current clamps or sensors with a voltage output. AC current clamps with BNC connectors can be connected directly to the MR8870's analog inputs for portable industrial measurements. Compatible HIOKI Rogowski sensors support current measurements up to 5000 A, depending on the selected sensor. For higher accuracy or DC current applications, compatible current sensors with ME15W connectors can be used in combination with an external sensor unit for sensor power supply. The measurable current range and frequency response are defined by the selected external sensor, while the overall system bandwidth of the MR8870 is DC to 50 kHz. Logic inputs and probes The MR8870 provides four logic input channels for simultaneous recording of digital signals with analog waveforms. The logic inputs can also be used as trigger source or for time correlation of switching states with measured voltage and current signals. For low-voltage digital and contact signals, the Logic probe 9320-01 supports detection up to 50 V DC, including PLC outputs and open-collector signals, with pulse detection down to 500 ns. For relay drive and mains-level signals, the isolated Logic probe MR9321-01 enables detection of AC or DC signals up to 250 V and can be used for monitoring contactors, relay coils or power line interruptions.Memory, data handling and power supply The MR8870 provides 2 MWords of internal memory per channel for event-based waveform recording at the maximum sampling rate. For extended measurements or continuous logging, data can be stored on a removable memory card. When connected to a PC via USB, the MR8870 appears as a removable drive, providing direct access to files stored on the memory card. Recorded data can be analyzed using compatible software including the Dedicated Wave Processor Program for the 8870-20, WaveViewer or the 9335 Wave Processor. The compact housing weighs approximately 600 g and is designed for handheld use in field environments. The MR8870 can be powered using the included Z1005 AC adapter, an external DC supply or an optional battery pack. Battery operation enables up to two hours of autonomous measurement. The MR8870 is manufactured in Japan.

The Hioki MR8875 Memory Recorder is a high-speed, multi-channel logger designed for long-term data recording and real-time waveform monitoring. It supports various input modules for mixed signal measurement, including voltage, temperature, strain, and CAN signals, with a sampling period as short as 2 µs. Its robust design is suitable for harsh environments, making it ideal for applications such as battery evaluation, motor testing, and power equipment analysis. Technical Details: Channels: Up to 60 channels with input modulesSampling Rate: 500 kS/sMemory Capacity: 32 MW (64 MB) Display: 8.4-inch TFT color LCD Storage: SD card, USB memory stick Dimensions: 298 mm × 224 mm × 84 mmWeight: 2.4 kg (excluding modules)

The MR8880 is a 4 channel portable data acquisition system (DAQ) with a maximum sampling rate of 1Msamples/s on all analog channels simultaneously. It has 4 analog direct input channels for voltages up to 600V and 8 logic channels.Technical Details: Complies CAT III 600V isolation for direct measure of 480V power line 4 complete isolated channels Operating temperature range of -10°C to 50°C Built to withstand mechanical shocks and vibrations PRESET function A memory capacity of 14bit × 1 M words/ch (1 word = 2 bytes)

The CM7290 is the display and output unit for the CT7600 and CT7700 series AC/DC current sensors, providing a stand-alone clamp-on meter for field use or enabling waveform signals to be output to a Hioki chart recorder or logger for further analysis. Power supply and signal output for CT7000 series current sensor Simultaneous dual display of measured values, frequency and output rateFour output formats to output data to logger or other devices (via display unit) Supports AC adapter, AA alkaline batteries and external power supply

The L0220-01 extention cable is made for extending a sensor cable connected to Hioki Display Units equipped with HIOKI connector PL14. Technical details: Length: 2m Use for: CT7631, CT7636, CT7642, CT7731, CT7736, CT7742, CM7290, CM7291 Connector type: Hioki PL14

The L0220-02 extention cable is made for extending a sensor cable connected to Hioki Display Units equipped with HIOKI connector PL14. Technical details:Length: 5m Use for: CT7631, CT7636, CT7642, CT7731, CT7736, CT7742, CM7290, CM7291 Connector type: Hioki PL14

The L0220-03 extention cable is made for extending a sensor cable connected to Hioki Display Units equipped with HIOKI connector PL14. Technical details: Length: 10m Use for: CT7631, CT7636, CT7642, CT7731, CT7736, CT7742, CM7290, CM7291 Connector type: Hioki PL14

AC/DC current sensor, DC up to 10kHz (-3dB), 600A AC/DC, +/-1.8% phase accuracy, 33 mm core diameter, 2.5m cable length, PL14 connection

The Hioki CT7642 is a high-capacity AC/DC current sensor capable of measuring currents up to 2000 A. It operates over a wide frequency range from DC to 10 kHz, making it ideal for power electronics and waveform analysis. With a large conductor diameter of 55 mm, it is designed for industrial applications requiring precise, high-current measurements.The sensor provides high accuracy of ±1.5% for DC measurements and maintains performance across varied environmental conditions. Compatible with Hioki's Memory Recorders and data loggers, the CT7642 ensures reliable data acquisition for long-term monitoring.Technical Information:Measurement range: 2000 A AC/DC Frequency range: DC to 10 kHz Maximum conductor diameter: 55 mm Accuracy: ±1.5% for DC (45 Hz to 66 Hz) Operating temperature: −25°C to 65°C Safety category: CAT III 1000 V / CAT IV 600 VOutput connector: HIOKI PL14