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701270 NDIS Strain Module

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The Yokogawa 701270 is a two-channel NDIS strain module designed for strain gauge measurements on the ScopeCorder high-speed DAQ platform. Used with compatible NDIS bridge heads such as the 701955 or 701956, it provides selectable bridge excitation, electronic auto balance, and 100 kS per second, 16-bit acquisition for reliable static and dynamic strain analysis.

 
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Key Features

  • Two-Channel NDIS Strain Measurement: Provides two isolated input channels designed for use with NDIS bridge heads such as the 701955 and 701956, enabling accurate strain gauge and bridge-based measurements.
  • Integrated Bridge Excitation and Auto Balance: Supports built-in bridge power supply selectable at 2 V, 5 V, or 10 V, along with electronic auto balancing to simplify setup and ensure stable strain measurements.
  • Wide Measurement Range for Strain Applications: Covers strain ranges from ±500 µSTR up to ±20000 µSTR and supports mV/V inputs, accommodating a wide variety of strain gauges and transducers used in structural testing.
  • Suitable for Structural Durability Evaluation: Enables detection and display of mechanical stress and deformation, supporting evaluation of elasticity, fatigue, and durability in materials and structures.
701270 Strain Module (NDIS) – specifications
Item Specifications
Standard operating conditions Temperature: 23 ±5 °C
Humidity: 20 to 80 % RH
After a 30 minute warm-up and after calibration and auto balance
Effective measurement range −FS to +FS (set using upper and lower limits)
Number of input channels 2
Maximum sample rate 100 kS/s
Input type DC bridge (auto balancing), balanced differential input, and isolated
Auto balance type Electronic auto balance
Auto balance range ±10000 µSTR (1 gauge method)
Bridge voltage Select from 2 V, 5 V, 10 V
Gauge resistance 120 Ω to 1000 Ω (bridge voltage: 2 V)
350 Ω to 1000 Ω (bridge voltage: 2 V, 5 V, 10 V)
Gauge factor 1.90 to 2.20 (set in 0.01 steps)
Frequency characteristics1 (−3 dB point when a sine wave of amplitude ±3 div is applied) DC to 20 kHz
mV/V range support Supports the strain gauge transducer unit system.
mV/V range = 0.5×(µSTR range/1000)
Measurement range (FS) and measurement range When using STR range
Measurement range (FS) Measurement range
500 µSTR −500 µSTR to +500 µSTR
1000 µSTR −1000 µSTR to +1000 µSTR
2000 µSTR −2000 µSTR to +2000 µSTR
5000 µSTR −5000 µSTR to +5000 µSTR
10000 µSTR −10000 µSTR to +10000 µSTR
20000 µSTR −20000 µSTR to +20000 µSTR
When using mV/V range
Measurement range (FS) Measurement range
0.25 mV/V −0.25 mV/V to +0.25 mV/V
0.5 mV/V −0.5 mV/V to +0.5 mV/V
1 mV/V −1 mV/V to +1 mV/V
2.5 mV/V −2.5 mV/V to +2.5 mV/V
5 mV/V −5 mV/V to +5 mV/V
10 mV/V −10 mV/V to +10 mV/V
DC accuracy1 ±(0.5 % of FS + 5 µSTR)
Maximum input voltage (at a frequency of 1 kHz or less) Between Input+ and Input−: 10 V (DC+ACpeak)
Maximum rated voltage to ground – between input and case and between inputs (at a frequency of 1 kHz or less) Between each terminal and earth ground: 42 V (DC+ACpeak) (CAT II, 30 Vrms)
Input connector NDIS connector (Recommended by JSNDI (The Japanese Society for Non-destructive Inspection)
Common mode rejection ratio 80 dB (50 Hz/60 Hz) or more (typical value2)
A/D converter resolution 16 bit (4800 LSB/div ±FS: Upper = +FS, Lower = −FS)
Temperature coefficient Zero point: ±5 µSTR/°C (typical value2)
Gain: ±0.02%/°C (typical value2)
Bandwidth limit Select from Full, 1 kHz, 100 Hz, 10 Hz
Cutoff characteristics: –12 dB/OCT (typical value2)
Function mV/V support. Supports the strain gauge transducer unit system.
Standard accessories NDIS connector (for external connection: PRC03-12A10-7M10.5 by Tajimi) A1002JC: 2 pieces
Compatible accessories (sold separately) Recommended bridge head 701955 (NDIS 120 Ω, enhanced shield version, comes with a 5-m cable)
Recommended bridge head 701956 (NDIS 350 Ω, enhanced shield version, comes with a 5-m cable)
Notes
  • Highly sensitive measurements are made in the µV level in strain measurements. Therefore, take measures against noise at the strain sensor perimeter, bridge head, and cable wiring.
  • Depending on the noise environment, an error may result in the balance. Check the influence before making measurements.
  • The bridge head specified by YOKOGAWA has high noise resistance.
  • Some of the strain gauge sensors and bridge heads made by other manufacturers do not have sensing wires connected. (No such problems with bridge heads made by YOKOGAWA.) If such products are used, an error may result in the bridge voltage leading to measurement errors, because sensing does not work effectively. Perform sensing as close to the bridge head as possible.
  • The connector shell is connected to the case potential.
  • When a bridge head (701955 or 701956) is used, the connector shell, cable shield, and the bridge head case are all connected to the case potential of the DL950.
  • When a bridge head (701955 or 701956) is used, the connector shell, cable shield, and the bridge head case are all connected to the case potential of the instrument.
  • Be sure to execute balancing again when you change the range or the bridge voltage.
Module front view
Module front view (NDIS connector): A: Bridge+ (positive bridge voltage); B: Input– (negative measurement signal); C: Bridge– (negative bridge voltage); D: Input+ (positive measurement signal); E: Floating common; F: Sense+ (positive bridge voltage sensing); G: Sense– (negative bridge voltage sensing). The connector shell is connected to the case potential.

1. Value measured under standard operating conditions.
2. Typical values represent typical or average values. They are not strictly warranted.

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