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| 2120B Vishay Micro-Measurements Strain Gage Signal Conditioner/Amplifier FEATURES * Accepts full, half or quarter bridges; all bridgecompletion gages built in, including 120/1000 and 350 dummies * Fully adjustable and regulated bridge excitation on each channel up to 12Vdc by front panel control * Continuosly variable amplifier gain up to 2100 by frontpanel control * Separate bridge-power switch * Output 10Vdc at 100mA, short-circuit; proof and current limiting standard * LED null indicators provided on each channel to indicate amplifier and bridge-balance condition * High stability with temperature and time * Frequency response up to 50kHz 2120B REAR VIEW DESCRIPTION A two-channel plug-in amplifier module that includes bridge completion, bridge balance, amplifier balance, bridge-excitation regulator and shunt calibration. SPECIFICATIONS These specifications apply for each of two independent channels per module. Inputs: Quarter (120/1000 and 350), half and full bridge (50-1000). Quarter-bridge dummy gages provided. Bridge Excitation: 0.5 to 12 Vdc (adjustable for each channel) with 120 full-bridge load. Short-circuit current: <40 mA. Ripple, noise, and 10% line change: 2 mV max. Load regulation: 0.2% no-load to 120 load (10% line change). Bridge Balance: 2000 (quarter, half, or 350 full bridge), range can be changed by internal jumper to 4000 or 6000. Calibration: Two-position (center off) toggle switch. Standard factory-installed resistors (0.1%) simulate 1000 at GF=2. Amp Gain: 1 to 2100 continuously adjustable 1%. Bandpass: DC to 5 kHz (min): -0.5 dB (-5%). DC to 15 kHz: -3 dB. Can be extended by internal jumper to: DC to 17 kHz: -0.5 dB; DC to 50 kHz: -3 dB. Amp Input: Temperature Coefficient of Zero: 1V/C RTI (referred to input), 210V/C RTO (referred to output); -10 to +60C (after 30 minute warm-up). Noise RTI: (350 source impedance) 1V p-p at 0.1 Hz to 10 Hz; 2V p-p at 0.1 Hz to 100 Hz; 2V at 0.1 Hz to 50 kHz. Noise RTO: 50V p-p at 0.1 Hz to 10 Hz; 80V p-p at 0.1 Hz to 100 Hz; 100V at 0.1 Hz to 15 kHz; 200V at 0.1 Hz to 50 kHz. Input Impedance: >100M (balance limit resistor disconnected). Common-Mode Rejection: (dc to 60 Hz). Gain Multiplier CMR (dB) X2 67 X20 87 X200 100 Source Current: 10 nA typical; 40 nA max. Output: 10V (min) at 100 mA. Current Limit: 140 mA. Optional Feature: May be ordered with, or be field upgraded for, remoteoperation relays for control of shunt calibration and bridge excitation (off). Requires remote-operation capability in the Model 2150 or 2160. Contact Vishay Micro-Measurements for details. Size: 5.25 H x 2.94 W x 10.97 D in (133 x 75 x 279 mm). Weight: 2.2 lb (1.0 kg). All Specifications are nominal or typical at + 23C unless noted. micro-measurements@vishay.com www.vishaymg.com 1 Document Number: 11251 Revision 21-Nov-03 |
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