Atec 2311 User Manual

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Model 2311

Model 2311

Signal Conditioning Amplifier

Description

While the Model 2311 provides wider frequency response and more
versatile excitation, both 2310 and 2311 Signal Conditioner/Amplifier

Modules accept inputs from strain gages, load/pressure/dc displacement
transducers, potentiometers, thermocouples, RTD's and nickel temperature
sensors, without any internal modification.

Controls on the 2311 are arranged in sections, permitting easy setup.
Clearly marked push-button and single-purpose switches minimize the
possibility of operator error during use. With the exception of the playback
switch, all operational and monitor controls are on the front panel. Switches
for selecting remote sense and specific shunt calibration configurations are
located on the printed circuit board inside the unit.

Front Panel

Galvanometer: Electronic adjustment for zero positioning

and span of the galvanometer, remote from recorder.
Calibration: Momentary two-position switches, +A and +B,
control shunt calibration levels; 4 point.
LED Display: Set up indicator for amplifier balance, bridge
balance and for monitoring the output polarity.
Filter Section: Push-button controls for activating appropriate
low-pass active filter, or selecting wide-band operation (WB).
Electronic Bridge Balance Section: Three-position
switch--OFF, ON, RESET--for electronic bridge balance; auto
ranging up to +25 000 microstrain with nonvolatile zero
storage; yellow light indicates high-range operation or

Model 2311 (Signal Conditioning Amplifier): Strain Gage Instruments

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overrange condition. Vernier TRIM control is used to refine
bridge balance when desired.
AC IN: Capacitive coupling in the amplifier; eliminates static
component of the signal.
Bridge Excitation: ON-OFF switch for removing bridge
excitation from the strain gage or transducer.

Amplifier Balance: Adjusts any amplifier offset.
Excitation Level: Twelve-position switch; values arranged

for doubling power with each step. Also, variable setting: 0.4
to 6 Vdc.
Amplifier Gain Section: Continuously variable
potentiometer (1.00 to 11.00) plus push-button multipliers
control amplifier gain; direct-reading.
Battery Test: Momentary push button determines battery
level for bridge zero storage.

Main Power: Turns unit on/off; LED pilot light.
Pin Jacks: Monitoring of EXCITATION.

Rear Panel

AC Line Switch: Selects nominal 115 or 230 Vac operation.

Recessed to eliminate inadvertent movement.
Tape Playback Section: Slide switch activates magnetic
tape-playback operating mode. Connects the input to the filter
circuits and post amplifiers. BNC input connector.
Magnetic Tape Output: Full-scale +1.4V level available at
this BNC connector for driving magnetic tape recorder.
High-Level Output: Full-scale +10V level available at this
BNC connector for driving an oscilloscope, DPM, ADC, etc.
Output Receptacle: All three outputs available at this
connector for those who prefer to hard wire their connections
(mating plug included). Outputs are 75 mA for galvanometers,
+1.4V, and +10V.
Input Receptacle: All sensor inputs made through this 15-pin
quarter-turn connector. Pin selection determines mode of
operation (mating plug included).
Power Connector: Main power input from the rack adapter,
portable enclosure or individual line plug. Additional pins for
optional remote operation of shunt calibration, bridge
excitation (ON/OFF), and electronic bridge balance.

Specifications

Model 2311 (Signal Conditioning Amplifier): Strain Gage Instruments

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All specifications nominal or typical at +23 deg C unless noted.

Input

Strain Gages:

Quarter(120 ohms or1000 ohms and 350 ohms), half or full bridge (50 to
1000 ohms). Dummy resistors installed.

Transducers:

Foil or piezoresistive strain gage types.

Potentiometer.

DCDT displacement transducer.

Excitation

12 settings:
Variable setting: 0.4 to 6 Vdc, 0.7, 1, 1.4, 2, 2.7, 3.5, 5, 7, 10, 12 and 15
Vdc +1%, max.

Current:

0-100 mA, limited at 175 mA, max.

Regulation (0-100 mA, +10% line change):

+0.5 mV +0.04%, max measured at remote sense point. (Local sense: -5
mV, typical, at 100 mA, measured at plug.)

Remote Sense Error:

0.0005%/ohms of lead resistance (350 ohm load).

Noise and Ripple:

0.05% p-p, max (dc to 10 kHz).

Stability:

0.02%/deg C.

Level:

Normally symmetrical about ground; either side can be grounded with no
effect on performance.

Bridge Balance:

Method:

Counter-emf injection at preamp; automatic electronic; dual range; can be
disabled on front panel.

Ranges (auto ranging):

+5000 microstrain (1% bridge unbalance or 2.5 mV/V), resolution 2.5

Model 2311 (Signal Conditioning Amplifier): Strain Gage Instruments

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