HIOKI MR8870 Memory HiCorder – Portable 2-Channel Waveform & RMS Recorder

Overview

The Hioki MR8870 is a highly compact, high-performance Memory HiCorder designed for field engineers, maintenance teams, and technical users who need both waveform observation and RMS (true effective value) recording. It offers isolated channels, elevated safety levels, long record times, and robust storage media, all packed in a portable body. Whether you’re diagnosing motor start surges, analyzing inverter outputs, monitoring PLC logic timing, or assessing power line quality, the MR8870 delivers reliable results.

Key Features

• Dual-Channel Isolated Inputs: Two analog channels that are fully isolated from each other and from the device ground. This ensures safe measurements even on industrial power circuits.

• Waveform + RMS Recording Modes: Offers both high-speed transient waveform recording (MEM mode) and RMS/value-based long-term trends (RMS mode) – lets you capture both fast spikes and slower variations.

• High Sampling / Flexible Time Base: In MEM mode, time base ranges from 100 µs/div to 5 min/div; in RMS mode, recording intervals from 1 ms to 1 min per setting. Perfect flexibility for both transient and steady-state phenomena.

• Large Memory & Durable Storage: Each channel has ~2 MW memory depth, with 12-bit resolution; data is stored on CF card (up to ~2 GB).

• High Voltage Measurement Capability: Supports DC up to 400V; analog channel rating AC/DC 300V to ground in many uses; compatible with differential and current sensor probes for large-voltage/current measurements.

• Convenient Display & Interface: Bright 4.3-inch WQVGA TFT color screen for waveform/RMS display; USB 2.0 connection for file transfer; PC software included for waveform processing, overlay, reports.

• Portable & Field-Ready: Lightweight (~600 g including battery), compact dimensions; AC adapter or optional battery pack; built for on-site diagnostics, maintenance, and troubleshooting.

Applications

The MR8870 is perfectly tailored for technical users who need precise waveform & RMS monitoring in real environments. Typical use cases include:

• Motor Start Surge Analysis: Capturing large inrush currents and voltage dips when motors are powered on.

• Power Quality Testing: Monitoring voltage stability, harmonic disturbance, line voltage dropouts or surges, and comparing to regulatory limits.

• Inverter & Variable Frequency Drive (VFD) Output Evaluation: Checking switching quality, waveform distortion, common-mode noise.

• PLC / Relay Logic Diagnostics: Recording logic transitions, timing of relay outputs vs. power line events, troubleshooting control circuits.

• Maintenance & Field Inspections: Equipment health monitoring, fault detection in elevators, generators, power distribution, renewable energy (solar, battery systems).

• Safety & Regulatory Compliance: Verifying AC/DC safety limits, ensuring isolation and safe input when measuring live circuits.

Technical Specifications

Package Contents

What you’ll typically get with the MR8870:

• Hioki MR8870 unit (main body)

• AC Adapter Z1005

• Strap (hand/shoulder)

• USB cable (mini-B, for PC file transfer)

• Battery pack option (9780) if ordered with battery version

• Protective film / screen protector (part no. 9809)

• Instruction manual + measurement guide + RMS measurement guide

• PC Application Software (“Wave Processor”) included via CD-R or download

(Add any additional accessories sold separately, such as probes, current clamps, logic probes, differential probe P9000, etc.)

Call to Action

If you’re looking for a reliable, rugged, and versatile waveform + RMS recorder for field service, preventive maintenance, or lab work, the HIOKI MR8870 is a smart investment. Contact us now to get quotation, check stock, or arrange a hands-on demo. Add to cart or request a quote today!