Model 2120B
Strain Gage
Conditioner/Amplifier
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Description
A two-channel plug-in amplifier module that includes
bridge completion, bridge balance, amplifier balance,
bridge excitation regulator and shunt calibration.
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Front Panel
LED Display
: Setup/indicator for amplifier balance, bridge
balance, tension/compression.
Bridge Balance
: Resistively balances the bridge; standard
locking knob; digital locking knob ("K"
option).
Gain Range & Vernier
: Varies amplifier gain between 1-2100.
Bridge Excitation
: Varies bridge excitation between 0.5-12 Vdc.
Amplifier Balance
: Adjusts amplifier offset.
Shunt Calibration
: (2 points).
Bridge Excitation (on/off)
: Removes bridge excitation. |
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Rear Panel
Strain Gage/Transducer Input
: Quarter, half, and full bridge.
Output
:
+
10 Vdc,
+
100 mA.
Power Receptacle
|
Specifications
These specifications apply for each of two
independent channels per module.
-
Inputs:
- Quarter (120 ohms/1000 ohms and 350 ohms), half
and full bridge (50-1000 ohms).
Quarter-bridge dummy gages provided.
-
Bridge Excitation:
- 0.5 to 12 Vdc (adjustable for each channel)
with 120 ohms 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 ohms load (10% line change).
-
Bridge Balance:
-
+
2000 microstrain (quarter, half, or 350 ohms full
bridge), range can be changed by internal jumper to
+
4000 microstrain or
+
6000 microstrain.
-
Calibration:
- Two-position (center off) toggle switch.
Standard factory-installed resistors (
+
0.1%) simulate
+
1000 microstrain at GF=2.
-
Amp Gain:
- 1 to 2100 continuously variable
-
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 Imput:
-
Temperature Coefficient of Zero:
+
1 microvolt/deg C RTI
*
,
+
210 microV/deg C RTO
**
;
-10 deg to +60 deg C (after 30 minute warm-up).
Noise RTI:
(350 ohm source impedance)
1 microvolt p-p at 0.1 Hz to 10 Hz;
2 microvolt p-p at 0.1 Hz to 100 Hz;
2 microvolt rms at 0.1 Hz to 50 kHz.
Noise RTO:
50 microvolt p-p at 0.1 Hz to 10 Hz;
80 microvolt p-p at 0.1 Hz to 100 Hz;
100 microvolt rms at 0.1 Hz to 15 kHz;
200 microvolt rms at 0.1 Hz to 50 kHz.
Input Impedance:
>100 megohms (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
Measurements Group
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).
*
Referred to input
**
Referred to output
Page 4 of 9
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Vishay Measurements Group