DMM STATION MR8990+MR8741/MR8740

Measure Minute Changes in Voltage at a High Level of Precision across 32 Channels at the Same Time

The MR8740 and MR8741 are rack-mountable data acquisition systems that deliver high-speed, multi-channel measurements over maximum of 32+22 channels. The MR8990 DVM unit is a 2-channel input unit for the MR8740/MR8741 for measuring minute fluctuations in output from sensors in automobiles and other equipment and voltage fluctuations in devices such as batteries at high levels of precision and resolution.

Key Features

  • Use the new DVM Unit MR8990 to measure DC voltages on 2 channels (for use with the Memory HiCorder MR8741/8740 only)
  • High-precision measurement for applications such as investigating minute voltage fluctuations in sensor output
  • The MR8741 (MR8740) can save data from 16 (or 54) Digital Voltmeter Units at once. (DCV measurement only)
  • Unlike standard multi-channel scan-type loggers, these instruments can perform simultaneous sampling
  • High accuracy of ±0.01 % and super-high 1.2 million-count resolution
  • High-speed sampling at 500 samples/s
  • Isolated input (channel-to-channel and channel-to-chassis: max. rated voltage to earth of 300 V AC/DC)

Model No. (Order Code)

MR8740 Max. 54ch, 864MW memory, main unit only
MR8741 Max. 16ch, 256MW memory, main unit only
MR8990 For the MR6000, MR8740, MR8847A, MR8827, and similar products
Note: Instrument requires input units and other dedicated options. Input cords not included. The MR8990 cannot operate alone.

DVM Unit MR8990 Basic specifications

Accuracy guaranteed: 1 year
Measurement functions Install into Memory HiCorder MR8740/8741 for use; 2 channels of DC voltage measurement
Measurement ranges
(20 div. f.s.)
100 mV range (5 mV/div.): -120.0000 mV to 120.0000mV, 0.1 μV resolution
500 V range (50 V/div.): -500.000 V to 500.000 V, 1 mV resolution, 5 ranges
Measurement accuracy Basic accuracy: ±0.01% rdg. ±0.0025% f.s.
Max. allowable input 500 V DC (upper limit voltage that can be applied between input terminals without damage)
Max. rated voltage to earth 300 V AC/DC (input and instrument are isolated; upper limit voltage that can be applied between input channels or between input channels and chassis without damage)
Max. sampling rate 2 ms (500 samples/s)

Main Unit MR8740/8741 Basic specifications

Accuracy guaranteed: 1 year
  MR8740 MR8741
Number of channels Block I: 16 analog units]
From 32 analog + 8 standard logic
[Block I: 13 analog units + 3 logic units]
26 analog + 56 logic (8 standard logic + 48 logic unit)
[Block II: 11 analog units]
From 22 analog + 8 standard logic
[Block II: 8 analog units + 3 logic units]
16 analog + 56 logic (8 standard logic + 48 logic unit)
*Instrument consists of two blocks, Block I and Block II
*Block I and Block II start measurement simultaneously by means of trigger synchronization (internal setting)
[8 analog units]
From 16 analog + 16 standard logic
[5 analog units + 3 logic units]
10 analog + 64 logic (16 standard logic + 48 logic unit)
  *Analog unit channels are isolated from each other and from the recorder. Logic unit channels and standard logic terminal channels share a common GND with the recorder.
Memory capacity 16 MW/ch (fixed), total of 864 MW installed 16 MW/ch (fixed), total of 256 MW installed
Removable storage USB memory (2.0)
Display None (1 digital DVI terminal per block, 800 × 600 dots) None (1 digital DVI terminal, 800 × 600 dots)
External interfaces [LAN] 100Base-TX (DHCP and DNS support, FTP server, HTTP server)
[USB] USB 2.0 Series A receptacle × 2 (mouse operation)
Power supply 100 to 240 V AC, 50/60 Hz (250 VA max.) 100 to 240 V AC, 50/60 Hz (120 VA max.)
Dimensions and mass 426 mm (16.77 in)W × 177 mm (6.97 in)H × 505 mm (19.88 in)D, 10.8 kg (3809.5 oz) (main unit only) 350 mm (13.78 in)W × 160 mm (6.30 in)H × 320 mm (12.60 in)D, 5.4 kg (190.5 oz) (main unit only)
Included accessories Instruction manual ×1, Application disk (Wave viewer Wv, Communication commands table) ×1, Power cord ×1

Voltage measurement (1)

For DVM unit MR8990 only