Oscilloscope-like Waveform Observation, Plus Recording of RMS Variations - In a Single Device

Hioki Memory HiCorders are high-speed waveform monitoring and recording devices that can simultaneously measure multiple quick-changing phenomena due to complete isolation between channels and from each channel to the ground. The MR8870 is a handheld data acquisition (DAQ) recorder built in with 2 analog channels and 2MW of memory, suitable for elevator maintenance, machine, motor and inverter fault analysis, testing and inspections.

Key Features

  • Mode for recording instantaneous waveform and RMS fluctuations
  • Save values in real time to a CF card
  • Record four channels at once by synchronizing two instruments with the bundled PC application
  • Compact and easy to carry
  • Fast, 1MS/s performance despite the compact size
  • Built-in, compact-yet-sharp QVGA-TFT wide LCD

Model No. (Order Code)

MR8870-20 2ch, English model
Note: Input cords and battery pack are not included. Purchase the cords appropriate for your application separately. The AC Adapter Z1005 is included as standard.

Record Motor Rush Current

Precisely record motor power-on inrush current waveforms when paired with the 9018-50 Clamp On Probe or 3283 Clamp On Leak HiTester. Measure direct current waveforms with a variety of AC/DC current sensors.

Measure CB Timing

Analyze the relationships of multi-point logic signals and analog waveforms to detect timing issues that can affect power supply circuit breakers. Use logic probes to record relay operations on up to four channels, or use the Differential Probe P9000 for three-phase 440 v power line measurements and for support of CAT III 600 V measurement categories.

Analyze Sequence Controller Issues

When sequence controllers being used in processes such as production and testing lines stop due to errors or generate warning output, potential causes include momentary AC power interruptions and brownouts. The MR8870 is ideal for analyzing the operation of such systems since it can record the correlation of sequence relay signals, AC power circuits, and DC voltage circuits as waveforms using power supply anomalies as a trigger.

Basic specifications

Accuracy guaranteed: 1 year
Number of channels 2 analog channels + 4 logic channels (standard)
Note: Isolated analog channels, isolated input and frame, logic has common GND
Measurement ranges 10 mV to 50 V/div (10 div full-scale), 12 ranges, Resolution: 1/100 of range
Max. rated voltage Between terminals: 400 VDC, Between terminal to earth: 300 VAC, DC CAT II
Frequency characteristics DC to 50 kHz (-3 dB)
Time axis
(Memory mode)
100 µs to 5 min/div, 20 ranges,at 100 points/div resolution, three steps of time-axis magnification from ×2 to ×10, and 9 steps of time-axis compression from ×1/2 to ×1/1,000
Recording intervals
(RMS mode)
1 ms to 1 min., 16 settings, sampling period: 200 μs (fixed) (for AC voltage/current, 1,000 RMS values/sec.), envelope mode always on
Note: Only the maximum value and minimum value for each recording interval are recorded.
Measurement functions Memory recorder (high speed recording), RMS recorder (50/60 Hz, DC only)
Memory capacity 12-bits × 2M-words/ch (1 word = 2 bytes)
Removable storage CF card TYPE I slot ×1 (Up to 2 GB)
Display 4.3-inch WQVGA-TFT color LCD (480 × 272 dots)
Displayable languages English, Japanese
Interfaces USB 2.0 mini-B receptacle ×1, Functionality: Connect the instrument to a PC to send files on the CF card to the PC. The instrument cannot be controlled from a PC.
Printer N/A
Power supply AC Adapter Z1005: 100 to 240 VAC (50/60 Hz) , 30 VA max. (when using the AC adapter and charging the 9780 with the instrument)
Battery Pack 9780: 3 VA, continuous operating time of approx. 2 hr. (25°C reference value; when used with the Z1005, the Z1005 takes priority), charging time of 200 min. using the AC adapter (25°C reference value) (option)
External DC power: 10 to 16 V, 10 VA max. (connection cord of 3 m or less is available by special-order)
Dimensions and mass 176 mm (6.93 in)W × 101 mm (3.98 in)H × 41 mm (1.61 in)D, 600 g (21.2 oz) (with the Battery pack 9780 installed)
Included accessories Instruction manual ×1, Measurement guide ×1, AC adapter Z1005 ×1, Strap ×1, USB cable ×1, Application disk (Dedicated program for the MR8870) ×1, Protection sheet 9809 ×1

LabVIEW and MATLAB support

Compatible models LabVIEW MATLAB script
MR8870-20 N/A N/A

Storage media (3)

*The CF card includes a PC card adapter.

*PC Card Precaution
Use only PC Cards sold by HIOKI. Compatibility and performance are not guaranteed for PC cards made by other manufacturers. You may be unable to read from or save data to such cards.

Input cable (A) (4)

*Voltage is limited to the specifications of the input section

Input cable (B) (3)

*Voltage is limited to the specifications of the input section

Input cable (D) (2)

Custom cable (0)

*For P9000. Inquire with your Hioki distributor.

(1) Bus powered USB cable
(2) USB(A)- Micro B cable
(3) 3-prong cable

Input cable (E) (2)

*Voltage to ground is within this product's specifications. Separate power source is also required.

Non-contact Voltage measuring (0)

Logic signal measurement (2)

PL23 (10-pin) - ME15W (12-pin) conversion (1)

POWER SUPPLY for Current Sensors (4)

*A separate power supply (CT955x) is required in order to use a high-precision current sensor.

*Only sensors with ME15W (12-pin) terminals (-05 type) can be connected to the CT955x. *The separately available Conversion Cable CT9900 is required in order to use a sensor with PL23 (10-pin) terminal.

Precautions when connecting a high-precision current sensor to a Memory HiCorder (0)

Connecting to the MR8880/MR8875/MR8870
• High-precision current sensor (ME15W) + CT9555 + BNC cable MR8870
• High-precision current sensor (PL23) + CT9900 + CT9555 + BNC cable → MR8870

Power supply (2)

*Z1005 is a bundled accessory

Other options (4)

*The 9809 is a bundled accessory