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Model 10A70-2
 Dual Strain Gage Conditioner

Input Type Description SPS6000 SPS8000 System 10
Force, Pressure, Strain,
Torque, Weight 		Dual Strain Gage
 X*X
 X-X
 X*X


This is a general-purpose two-channel conditioner for input of pressure, force, torque, weight, and other variables that may be measured by conventional DC-excited load cells, pressure sensors, and other strain gage transducers employing a four-arm bridge of nominal 350 ohm or higher. Its advanced design techniques overcome errors that traditionally plague the strain-gage conditioning process. Separate excitation for each channel uses remote sensing of bridge voltage and is slaved to a common System Reference Voltage. The result is stable ratiometric measurement, unaffected by possible drift in any power supply. Input impedances in excess of 10,000 megohms are presented to signal leads to eliminate cable resistance as a source of error. Allowable cable length has virtually no practical limits.

Daytronic’s amplifier-per-channel design with solid-state chopper stabilization and low-pass active filtering yields noise-free output of known and stable gain factor. For steady indication and smooth, dependable control action, the 10A70-2 provides a true average value of the measured variable, even in the face of substantial dynamic content.

Model 10A70-2 data channels may be calibrated through a conventional "two-point" ("deadweight") procedure- or, when both "mV/V" sensitivity and the corresponding full-scale rating of the transducer are known, by a convenient "calculated" calibration technique. In System 10, "calculated" calibration makes use of the MV/V CALIBRATION (MVV) command.

Specifications:
  • Transducer Types: Conventional 4-arm strain gage bridges, nominal 350 ohm or higher
  • Input Ranges (full-scale): ±0.75, 1.50, or 3.00 mV/V; automatically selected- on an individual channel basis- when the channel is configured*
  • Excitation (per channel): Nominal 10 (i.e., ±5) V-DC; ±50 mA, maximum
  • Amplifier (per channel):
      Common-Mode Range: ±1 V operating; ±9 V without instrument damage
      Common-Mode Rejection Ratio: DC: -100 dB; at 60 Hz: -120 dB
      Input Impedance (Differential and Common-Mode): Greater than 10,000 M-ohm
      Offset: Initial: ±0.3 mV; vs. Temperature: ±0.05 µV/°C; vs. Time: ±5 µV/month
      Gain Accuracy: ±0.02% of full scale typical, following calibration**
      Gain Stability: vs. Temperature: ±50 ppm/°C; vs. Time: ±50 ppm/month
  • Filter (per channel): 3-pole modified Butterworth; 3 dB down at 10 Hz; 60 dB down at 100 Hz
      Step-Response Settling Time (Full-Scale Output):
      To 1% of final value: 100 msec
      To 0.1% of final value: 150 msec
      To 0.02% of final value: 600 msec
  • Auxiliary Outputs: Filtered outputs available on wire-wrap pins
    *Since channel zeroing is by digital techniques, no input balance control is provided. The allowable input range, therefore, must include any initial unbalance (which, in commercially produced strain gage transducers, is negligible). Other transducers may have to be externally trimmed to be used with the Model 10A70-2, if zero unbalance exceeds 20% of full scale.
    **Initial (uncalibrated) inaccuracy may be as great as ±0.05% of full scale (see Accuracy Specifications). Maximum error that could occur upon replacement of a Model 10A70-2 not followed by calibration is ±0.1% of full scale.

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