Modules for MR8875 Memory Recorder – flexible measurements with up to 16 channels

The MR8901 Analog Unit is a 4-channel voltage input module for the memory recorder MR8875. It enables voltage measurement with simultaneous sampling across all channels. The module provides four isolated BNC input connectors with an input resistance of 1 MΩ and an input capacitance of 10 pF. It supports measurement ranges from 5 mV to 10 V/div with 11 selectable ranges. Simultaneous sampling at up to 500 kS/s across all channels allows acquisition of transient and dynamic signals. The frequency characteristics extend from DC to 100 kHz (–3 dB). The maximum allowable input voltage is 150 V DC, and the maximum rated voltage to earth is 100 V AC/DC.Typical applications include transient analysis, switching waveform recording, dynamic signal measurement, and multi-channel signal acquisition in laboratory and industrial environments. Technical specificationsNumber of channels: 4 (voltage measurement) Input connectors: Isolated BNC, 1 MΩ, 10 pFMeasurement range: 5 mV to 10 V/div (11 ranges) Sampling rate: 500 kS/s (simultaneous across all channels) Frequency characteristics: DC to 100 kHz (–3 dB)Maximum input voltage: 150 V DCMaximum rated voltage to earth: 100 V AC/DCLow-pass filter: 5 / 50 / 500 Hz, 5 kHz, OFF Input coupling: DC, GND Accuracy: ±0.5 % of full scale 

The MR8902 Voltage/Temp Unit is a 15-channel voltage and thermocouple input module for the MR8875 memory recorder, designed for stable multi-point DC voltage and temperature acquisition in demanding industrial environments.Each of the 15 channels can be individually configured for voltage or thermocouple measurement. With 16-bit A/D conversion and ranges from 500 µV/div up to 5 V/div, the module enables precise low-level signal acquisition across a wide measurement span. Simultaneous channel scanning supports synchronized multi-point monitoring at update rates down to 10 ms. The unit supports thermocouple types K, J, E, T, N, R, S, B and W, with selectable internal or external reference junction compensation. Internal compensation accuracy is ±0.5°C (added to measurement accuracy). Thermocouple broken-wire detection is integrated and switchable. High noise immunity supports reliable operation in electrically demanding environments, with a normal mode rejection ratio of ≥50 dB and a common mode rejection ratio up to 140 dB (with digital filter). Selectable 50 Hz or 60 Hz digital filtering enhances measurement stability under industrial mains conditions. Typical applications include multi-channel temperature profiling, environmental and thermal validation testing, industrial DC signal monitoring, and long-term trend recording in laboratory and field environments. Technical specificationsChannels: 15 (voltage / thermocouple) Measurement: Voltage, temperature (thermocouple); types K, J, E, T, N, R, S, B, WRe5-26Range / resolution: 500 µV to 5 V/div, 16-bit A/DInput: Push terminal, 1 MΩUpdate rate: 10 ms, 20 ms, 500 ms, 2 s Filter: Digital filter 50 Hz, 60 Hz, OFF Accuracy: ±0.1 % f.s. Voltage limits: 100 V DC input, 100 V AC/DC to earth

The MR8903 Strain Unit is a 4-channel strain and low-voltage input module for the memory recorder MR8875. It enables strain and voltage measurement with configurable inputs for each channel.Each channel can be configured for strain gauge or low-level voltage measurement. The module uses 16-bit A/D conversion and supports simultaneous sampling across all channels at up to 200 kS/s. The frequency characteristics extend from DC to 20 kHz. The strain measurement function supports bridge sensors from 120 Ω to 1 kΩ with a bridge excitation voltage of 2 V. Measurement ranges span from 20 µε/div to 1000 µε/div. Selectable low-pass filters (5 Hz, 10 Hz, 100 Hz, 1 kHz, OFF) are available. The maximum allowable voltage between input terminals and earth is 30 V AC rms or 60 V DC. The maximum bridge input voltage is 10 V DC. Typical applications include strain measurement, vibration analysis, and multi-channel data acquisition in laboratory and industrial environments. Technical specificationsChannels: 4 (strain/voltage selectable per channel, auto-balance ±10000 με) Input: ≥1 MΩ, bridge 120 Ω to 1 kΩ, excitation 2 V ±0.05 VMeasurement ranges: 20–1000 με/div (strain), 50–1000 μV/div (voltage) Accuracy: ±0.5 % f.s. (range-dependent, incl. offset) Sampling / resolution: 200 kS/s simultaneous, 16-bit (1/1250)Frequency characteristics: DC to 20 kHz (+1/−3 dB)Low-pass filter: 5, 10, 100 Hz, 1 kHz, OFF Maximum voltage: 10 V DC input, 30 V AC rms / 60 V DC to earth 

The MR8904 CAN Unit is a 2-port CAN interface module for the memory recorder MR8875. It enables acquisition and output of CAN communication signals. The module supports CAN communication according to ISO 11898 and SAE J2411 standards. Each port can be configured for high-speed CAN, low-speed CAN, or single-wire CAN. CAN messages can be received and transmitted, and acknowledgment settings can be configured. Received CAN signals can be converted into analog or logic channels for recording. Up to 15 analog channels (16-bit equivalent) and 16 logic channels can be output. Signal mapping depends on bit length.The module provides ID-trigger functionality and outputs a pulse signal when a specified CAN ID is received. Response time is within 200 μs after message reception.Typical applications include CAN bus monitoring, signal analysis, and synchronized recording of communication data in laboratory and industrial environments. Technical specifications CAN ports: 2 (D-sub, 9-pin)Standards: ISO 11898 (CAN 2.0b), ISO 11898-1/-2/-3, SAE J2411 Interface: High-speed CAN, low-speed CAN, single-wire CAN (per port selectable)Baud rate: 50 kbps to 1 Mbps (high-speed), 10 kbps to 125 kbps (low-speed), 10 kbps to 83.3 kbps (single-wire) Signal output: up to 15 analog channels (16-bit equivalent), 16 logic channels Signal mapping: 1 to 32-bit signals (channel allocation depending on bit width)ID trigger: pulse output on logic channelResponse time: ≤200 μsTerminator: 120 Ω ±10 %, switchableACK control: ON/OFF 

The MR8905 Analog Unit is a 2-channel voltage input module for the memory recorder MR8875. It enables voltage measurement of instantaneous values and AC RMS values. Each channel supports measurement ranges from 500 mV to 50 V/div. The module uses 16-bit A/D conversion and supports simultaneous sampling across both channels at up to 500 kS/s. The frequency characteristics extend from DC to 100 kHz (–3 dB).The module supports RMS measurement with defined accuracy and response time. Input coupling modes DC, AC-RMS, and GND are selectable. The maximum allowable input voltage is 1000 V DC or 700 V AC. The maximum rated voltage to earth is CAT II 1000 V AC/DC and CAT III 600 V AC/DC. Typical applications include voltage measurement, RMS evaluation, and waveform analysis in laboratory and industrial environments. Technical specifications Channels: 2 (voltage, instantaneous / AC RMS selectable) Input: banana connector, 4 MΩ, <1 pFMeasurement range: 500 mV to 50 V/divAccuracy: ±0.5 % f.s. (instantaneous), ±1.5 % / ±3 % f.s. (RMS, frequency-dependent) Sampling / resolution: 500 kS/s simultaneous, 16-bit (1/1250) Frequency characteristics: DC to 100 kHz (–3 dB) Low-pass filter: 5, 50, 500 Hz, 5 kHz, OFF Input coupling: DC, AC-RMS, GNDMaximum input: 1000 V DC, 700 V AC Maximum rated voltage to earth: CAT II 1000 V AC/DC, CAT III 600 V AC/DC