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Model 10A72-2C
 Enhanced Dual Strain Gage Conditioner

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


This premium two-channel conditioner is similar to the Model 10A70-2, except that

It allows the user to select a per-channel excitation of 1, 5, or 10 V-DC. Using low excitation helps reduce gage heating effects in stress analysis of materials with low thermal conductivity. See the table below for the full-scale mV/V ranges that correspond to each excitation level.

Each 10A72-2C channel is equipped with a 100-kilohm, 0.1% shunt-calibration resistor, which the user may replace with a different value, if desired. Through appropriate software commands, each resistor may be switched in and out to yield a positive or negative up-scale reading (shunt calibration can also be controlled by means of logic-level inputs through the 10A72-2C's rear I/O Connector). This feature allows faster, easier calibration of strain-gage data channels, especially when overall "deadweight" and/or "mV/V calculated" calibration is impractical.

When connected to an optional Model 10CJB-2 Dual Bridge Completion Card,* the 10A72-2C lets you connect each input to a 2-wire 1/4-bridge, 3-wire 1/4-bridge, 1/2-bridge, or full-bridge strain gage configuration. Each 1/4-bridge configuration may use either 120 or 350 ohms nominal gage resistance. The function of the Model 10CJB-2 is to "complete" the connected bridge- that is, to allow it to be seen by the Model 10A72-2C as a full (4-arm) Wheatstone bridge.

Channels originating from a Model 10CJB-2 require a special calibration procedure. The user may furnish his or her own pin-to-pin shielded cable for connecting the 10CJB-2 to the 10A72-2C's rear I/O Connector, or may use a special cable supplied by Daytronic. In either case, appropriate terminal connectors will be supplied.

The 10A72-2C yields higher internal accuracy than the Model 10A70-2 (see Specifications), which permits replacement of the card without recalibration.

By means of an internal jumper, the user may select for each channel either the standard 10-Hz analog filter or a wideband (100-Hz) filter specially designed for measurement of a highly dynamic input signal (see Specifications).


Specifications:
  • Transducer Types: Conventional 4-arm strain gage bridges, nominal 350 ohm or higher; 1/4- and 1/2-bridge gage configurations can be accom-modated by means of the Model 10CJB-2 Dual Bridge Completion Card or equivalent external bridge-completion circuitry supplied by the user
  • Input Ranges (full-scale): See table below; automatically selected- on an individual channel basis- when the channel is configured**
  • Excitation (per channel): Selectable 1, 5, or 10 V-DC (i.e., ±0.5, ±2.5, or ±5 V-DC, respectively), nominal; ±50 mA, maximum, for each voltage
  • Amplifier (per channel):
      Common-Mode Range: ±1 V operating; ±8 V without instrument damage
      Common-Mode Rejection Ratio: DC: -140 dB; at 60 Hz: -120 dB; at 1 kHz: -80 dB
      Input Impedance (Differential and Common-Mode): Greater than 10,000 M-ohm
      Offset: Initial: ±0.01 mV; vs. Temperature: ±0.2 µV/°C; vs. Time: ±5 µV/month
      Gain Accuracy: ±0.02% of full scale
      Gain Stability: vs. Temperature: ±50 ppm/°C; vs. Time: ±20 ppm/month
  • Filter (per channel): 3-pole modified Butterworth
    • Standard Filter: 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
    • Wideband Filter: 3 dB down at 100 Hz; 60 dB down at 1.2 kHz
        Step-Response Settling Time (Full-Scale Output):
        To 1% of final value: 10 msec
        To 0.1% of final value: 15 msec
        To 0.02% of final value: 65 msec
  • Auxiliary Outputs: 1-kHz bandwidth signals available on wire-wrap pins

Strain Gage Ranges for the Model 10A72-2C
1-V Excitation
5-V Excitation
10-V Excitation
7.5 mV/V
15.0 mV/V
30.0 mV/V
 1.5 mV/V
3.0 mV/V
6.0 mV/V
 0.75 mV/V
1.50 mV/V
3.00 mV/V


Notes:

*Or equivalent circuitry supplied by the user. When conditioning input from a 1/4-bridge or 1/2-bridge strain gage configuration, a 10A72-2C channel should be set to "Gage" mode (instead of "Transducer" mode). See the Model 10CJB-2 Dual Bridge Completion Card specifications for a complete description. (Back to Note 1)

**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 10A72-2C, if zero unbalance exceeds 20% of full scale. (Back to Note 2)

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