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Description Features The OMEGA OM2-163 Bridgesensor is a complete signal conditioning system on a card designed expressly for single half, or full bridge transducers. The OM2-163 consists of a high performance instrumentation amplifier, a user adjustable active filter, high stability bridge supply and all of the required circuitry, trimpots, etc., so that only point to point wiring need be made to the inputs, outputs and power to have a complete signal conditioning system up and running.
Specifications Conditions (Unless Noted): Ta = 25°C, Vs = ±15 VDC, G = 500 V/V Parameter Amplifier (1) Gain Range Adjustable (2) w/External Set Resistor Minimum Typical Units 500 5000 V/V 100 2 Gain Equation Rg = 100,000/(G-2) Gain Equation Accuracy 2 < G < 1000 V/V Gain Temperature w/Trimpots Coefficient Amplifier alone Nonlinearity, ±10V Output Swing Warmup Drift (3) Input Offset Vs.
Notes: (1) Specifications referred to the filter output (Pin N). (2) Using on board coarse and fine gain adjust trimpots. (3) Warm-up drift is specified as the input offset drift for the first 5 minutes after the application of power with G = 1000 V/V, Bridge supply = 10V driving a 350 ohm bridge. (4) Measured at 25°C Ambient with unit fully warmed up. (5) Measured from -Input to +Input or input with respect to ground. (6) Specified with 350 ohm bridge as source impedance.
If pin K is used as the Output Offset control, than J1 should be installed to prevent interaction of RP1. Filter Cutoff Frequency Adjustment Cutoff Frequency SW2 SW3 10 Hz ON ON 100 Hz 1000 Hz or User Select SW4 SW5 ON ON ALL OFF 1000 CX1 = CX2 = 0.0024 µF Fc -1 CUTOFF FREQUENCY > 1000 Hz Fc RX1 = 35,000/ 1000 Fc RX2 = 105,000/ 1000 -1 GAIN (db) PIN P - PIN N 0 -10 100Hz 1000Hz -30 -40 -50 1 10 100 1000 FREQUENCY (Hz) 10000 1000000 FIGURE 2.
2) Using a millivolt calibrator or the transducer output itself, set the gain so that the proper full scale output voltage is realized (the mV calibrator or transducer should be set to simulate full scale output). 3) If system offsets must be accounted for repeat step 1 again with the inputs disconnected from the source and connected to ground, or short them together with the bridge connected, then reconnect the inputs and re-zero the output with the bridge balance (if used).
OM2-163 Application Examples FIGURE 7. Half Bridge - 3 Wire FIGURE 8.
A-S 1-15 15 J1 ST1 ST3 ST2 ST4 J3 J2 J4 SW1 ON OFF FREQ 10HZ 100HZ 1KHZ RX1 CX2 RG R18 BRIDGE SUPPLY 10V FIXED ADJUSTABLE SW2 3 4 5 ON ON ON ON ALL OFF RX2 SW1- 1 2 3 4 5 R6 1 2 3 4 5 1 J5 FINE GAIN FILTERED OUTPUT COM TP3 TP4 COARSE GAIN RP5 RP4 INPUT OFFSET AMP OUT TP2 OUTPUT OFFSET BRIDGE BAL RP6 RP3 B+ ADJUST RP2 RP1 B+OUT TP1 OM2-163 Application Examples FIGURE 9.
WARRANTY/DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. OMEGA Warranty adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGAs customers receive maximum coverage on each product. If the unit malfunctions, it must be returned to the factory for evaluation.
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