Hioki MR8905 1000 V Analog Unit, 2-Channel High-Voltage Input Module for MR8875

Key Features At A Glance

• 16-bit A/D resolution at 1/1250 of range captures subtle changes in sensor signals
• Simultaneous 500 kS/s sampling (2 µs period) across all channels with the MR8901 or MR8905 analog units
• Up to four user-installable input modules, mixed in any combination and changeable after purchase
• Scales from 16 analog channels up to 60 thermocouple channels depending on installed modules
• 1000 V (CAT II) / 600 V (CAT III) direct high-voltage input via the optional Analog Unit MR8905
• Real-time waveform saving to genuine Hioki SD memory cards at intervals as short as 2 µs
• 8.4-inch SVGA TFT color touch-screen LCD with swipe-to-rotate display orientation
• Built-in 100BASE-TX LAN with Web server, FTP server, e-mail, and command control for remote operation

The Hioki MR8875 Memory HiCorder is a multi-channel high-speed data logger built into a compact, A4-size footprint for portability. It uses a plug-in module architecture: by selecting and installing up to four input modules, measurement capability ranges from 16 analog channels to 60 thermocouple temperature channels. The same instrument can mix and record voltage, temperature, strain, and CAN signals at 16-bit resolution, recording sensor signal waveforms faithfully using the same working principle as a digital oscilloscope writing to large-capacity internal memory.

Hioki documents the MR8875 across several measurement scenarios: verifying the operation of multi-axis industrial robots by mixing sensor outputs, strain, control signals, voltage, and temperature on multiple channels; R&D and science experiments, including recording and evaluating sensor output and use as a flatbed X-Y recorder; and development testing for construction machinery, agricultural machinery, and automobiles. Additional applications include battery evaluation — measuring individual cell voltage and EV battery testing — characteristics testing of power equipment such as load rejection and circuit breaker testing, and primary- and secondary-side measurement of inverter and motor systems.

ValueTronics stocks and holds its own test-and-measurement inventory in a 20,000 sq ft secure warehouse at 1675 Cambridge Drive in Elgin, Illinois. That combination lets engineers source the right logger and input-module configuration with confidence in what arrives on the bench.

Compare Other Models in This Series

The MR8875 is a single main unit whose capability is defined by the input modules installed in its four user-accessible slots. Rather than choosing between fixed instrument tiers, you select among Hioki's plug-in modules — the Analog Unit MR8901, Voltage/Temp Unit MR8902, Strain Unit MR8903, CAN Unit MR8904, and high-voltage Analog Unit MR8905 — and mix them in any combination to suit the measurement at hand.

Because modules are user-installable and can be changed after purchase, the same main unit moves between voltage, temperature, strain, and CAN measurement tasks. The comparison table below summarizes how the individual modules differ in channel count, measurement target, range, resolution, and sampling so the configuration can be matched to the signals being recorded.

Each new item shown below — the MR8875 main unit and its individual input modules — is offered on its own dedicated product page with condition-matched pricing, so you can build the exact configuration your application requires by adding the specific units you need.

The MR8875 main unit provides the recording engine, 8.4-inch SVGA touch-screen display, 32 Mega-word internal memory, SD and USB storage, 100BASE-TX LAN, and two standard pulse-input channels; it cannot operate alone and requires at least one input module to be installed.

The modules diverge primarily in measurement target and front-end specification. The MR8901 handles general voltage (100 mV to 200 V f.s., 4 µV resolution) at up to 500 kS/s; the MR8905 is the high-voltage unit (10 V to 1000 V f.s., direct 1000 V CAT II / 600 V CAT III) with switchable instantaneous and AC-RMS modes; the MR8902 adds thermocouple temperature measurement across 15 channels; the MR8903 targets strain and high-sensitivity voltage down to 1 mV f.s.; and the MR8904 provides CAN bus acquisition with two ports per unit.

Sampling and isolation also differ by module: the MR8901 and MR8905 sample all channels simultaneously at 500 kS/s (2 µs), the MR8903 at 200 kS/s (5 µs), and the MR8902 scans at a 10 msec rate suited to its slower temperature and DC-voltage measurements. Analog-unit channels are isolated from each other and from the main unit, while CAN ports, standard logic terminals, and standard pulse terminals share a common ground. Refer to the comparison table for each module's exact ranges, resolutions, and channel counts.

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Product Core & Specifications

Important: Real-time data saving and operation are guaranteed only with genuine Hioki SD memory cards.

Important: The MR8875 main unit (Model No. MR8875, Max. 16 to 60ch, 32 MWord memory, main unit only) cannot operate alone; input modules must be installed separately.

Important: The Analog Unit MR8905 does not include input cables. Separate purchase of the optional Connection Cable Set L4940 (× 2) and Alligator Clip Set L4935 (× 2), which consists of clips that fit onto the ends of the cables, is required.

Important: Use only HIOKI SD memory cards and USB memory sticks; compatibility and performance are not guaranteed for cards made by other manufacturers.

Important: A separate power supply (CT955x / Sensor Unit CT9555) is required in order to use a high-precision current sensor with the MR8875.

Important: When using the external power supply (three lines, +5 V output), the Differential probe 9322 can not be used.

Important: The recordable measurement data to a 2 GB SD memory card is approximately 90% of the time shown; the upper limit is 1,000 days but operation is guaranteed for 1 year.

Usage tip: pair the standard Analog Unit MR8901 with the Differential Probe P9000 series to enable high-voltage 1,000 V (CAT III) measurement; the P9000-02 adds RMS-level measurement of AC power lines.

About this New unit

This is a brand-new, factory-sealed unit, supplied exactly as it arrives from the manufacturer and backed by the full manufacturer warranty. For the exact configuration, available options, included accessories, or current lead time for your application, our Test Architects can confirm the details before you order.

ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.