2120B Vishay Micro-Measurements Strain Gage Signal Conditioner/Amplifier FEATURES 2120B REAR VIEW • Accepts full, half or quarter bridges; all bridgecompletion gages built in, including 120/1000 and 350Ω 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 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 (120Ω/1000Ω and 350Ω), half and full bridge (50-1000Ω). Quarter-bridge dummy gages provided. Bridge Excitation: 0.5 to 12 Vdc (adjustable for each channel) with 120Ω full-bridge load. Short-circuit current: <40 mA. Ripple, noise, and 10% line change: ±2 mV max. Load regulation: ±0.2% no-load to 120Ω load (10% line change). Bridge Balance: ±2000µε (quarter, half, or 350Ω full bridge), range can be changed by internal jumper to ±4000µε or ±6000µε. Calibration: Two-position (center off) toggle switch. Standard factory-installed resistors (±0.1%) simulate ±1000µε 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. Document Number: 11251 Revision 21-Nov-03 Amp Input: Temperature Coefficient of Zero: ±1µV/°C RTI (referred to input), ±210µV/°C RTO (referred to output); –10° to +60°C (after 30 minute warm-up). Noise RTI: (350Ω source impedance) 1µV p-p at 0.1 Hz to 10 Hz; 2µV p-p at 0.1 Hz to 100 Hz; 2µV at 0.1 Hz to 50 kHz. Noise RTO: 50µV p-p at 0.1 Hz to 10 Hz; 80µV p-p at 0.1 Hz to 100 Hz; 100µV at 0.1 Hz to 15 kHz; 200µV at 0.1 Hz to 50 kHz. Input Impedance: >100MΩ (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 + 23 °C unless noted. [email protected] www.vishaymg.com 1