Strain measurement unit NR-ST04

NR-ST04 - Strain measurement unit

  • CE Marking
  • CSA

Specifications

Model

NR-ST04 *1*2

Type

Strain measurement unit

Input method

Balanced differential input, channels not insulated from each other, input channels insulated from other units (PC)

Number of channels

4 ch *3

Measurement cycle

Maximum sampling cycle: 20 μs (50 kHz) to 60 s

A/D converting system

Successive approximation, simultaneous sampling of all channels

A/D resolution

16 bit

Input frequency band

5 kHz DC max. (−3 dB)

Maximum input rating

±1.0 V

Withstand voltage

Input to system bus/earth

1500 VAC (50/60 Hz) for 1 minute

Input impedance

1 MΩ or more

Input type

Voltage input

±2 mV, ±5 mV, ±10 mV, ±20 mV, ±50 mV

Strain input

±1000 μST, ±2000 μST, ±5000 μST, ±10000 μST, ±20000 μST

Measurable range

±50 mV: −55.00 to +55.00 mV
±20 mV: −22.000 to +22.000 mV
±10 mV: −11.000 to +11.000 mV
±5 mV: −5.500 to +5.500 mV
±2 mV: −2.2000 to +2.2000 mV
±20000 μST: −22000 to +22000 μST
±10000 μST: −11000.0 to +11000.0 μST
±5000 μS: −5500.00 to +5500.00 μST
±2000 μST: −2200.0 to +2200.0 μST
±1000 μST: −1100.00 to +1100.00 μST

Measurement accuracy

Gain accuracy

±0.2% of F.S. (with low-pass filter of 8 Hz and 50 Hz sampling averaged 20 times)

Display resolution

±50 mV: 10 μV
±20 mV: 1 μV
±10 mV: 1 μV
±5 mV: 1 μV
±2 mV: 0.1 μV
±20000 μST: 1 μST
±10000 μST: 0.5 μST
±5000 μS: 0.25 μST
±2000 μST: 0.1 μST
±1000 μST: 0.05 μST

Buffer memory

4M data*4

Warm up time

30 minutes or more

Applicable gauge resistance

Quarter bridge / half bridge system: 120 Ω (A 350 Ω strain gauge requires an external bridge box.);
Full bridge system: 120 Ω to 1 kΩ

Applied voltage

2 VDC (±0.4%)

Balance adjustment

System

Electronic balancing (auto-balancing)

Balance adjustment accuracy

±0.1% of F.S. (with low-pass filter of 8 Hz and 50 Hz sampling averaged 20 times)

Balance adjustment range

±29000 μST (during strain input), ±29 mV (during voltage input)

Gauge ratio

2.0 (fixed)

Low pass filter

Cutoff frequency

Auto, 5 kHz, 3.5 kHz (3 kHz), 2 kHz (1.5 kHz), 1 kHz (750 Hz), 500 Hz (370 Hz), 250 Hz (200 Hz), 120 Hz (100 Hz),
60 Hz (50 Hz), 30 Hz (25 Hz), 15 Hz (12 Hz), 8 Hz (6 Hz), 4 Hz (3 Hz); Value in parentheses is for 20 kHz sampling.

Attenuation characteristics

5th order Bessel filter, −30 dB/oct

Zero-point stability

Temperature characteristics

±2 μST/°C, ±2 μV/°C *5

Chronological changes

±1.5 μST/8 h, ±3 μV/8 h *5

Gain stability

Temperature characteristics

±0.05% of F.S./°C *5

Chronological changes

±0.3% of F.S./8 h *5

Common mode noise reduction ratio

80 dB or more (60 Hz DC max.)

Rating

Power consumption

3.0 W or less

Environmental resistance

Ambient temperature

0 to +40°C 32°F to 104°F

Relative humidity

10 to 85% RH (no condensation)

Weight

Approx. 230 g 8.12 oz (including two OP-51584: NR-ST04 10-pole terminal blocks)

*1 The above specifications are the values when auto-balancing is performed after the warm-up period in an environment with a temperature of 23°C ±3°C 73.4°F ±5.4°F.
*2 ST = strain / μ = 10-6
*3 Max. expansion: 216 ch (with 54 units connected, using NR-X100W), 24 ch (with 6 units connected, using NR-500)
*4 Limited by the NR-X100W buffer memory when using the NR-X100W.
*5 Does not include temperature characteristics and changes over time of built-in bridge resistors. Built-in bridge resistor stability: ±5 ppm/°C or less, ±50 ppm/year

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