2120B
Vishay Micro-Measurements
Strain Gage Signal Conditioner/Amplifier
FEATURES
• Accepts full, half or quarter bridges; all bridge-
completion 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 front-
panel 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-exci-
tation 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.
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, remote-
operation 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.
micro-measurements@vishay.com
www.vishaymg.com
1
Document Number: 11251
Revision 21-Nov-03
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