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AC/DC Strain Gage Amplifiers
for Interfacing Data Acquision Systems - Model P122 Series


Model P122 rackmount style

Two versions of this AC/DC Strain Gage Amplifier feature high gain, low noise, stabilized DC amplification with versatile input switching to permit operation as an AC amplifier.

They are intended to provide a signal conditioning interface for data acquisition systems, oscilloscopes and other devices. The large LED display continuously monitors the output and simplifies setup and calibration procedures.

Transducer excitation, balancing circuitry, amplification and filtering are standard features. With appropriate sensors, the P122 can process signals such as pressure, force, temperature and many others. The AC input switch positions provide an excellent interface for EEG, EMG, EOG, ECG and other bioelectric signals.

Some typical applications include multiple channel in-vitro tissue bath studies, cardiovascular measurements, pulmonary mechanics, gut motility studies and many more.

A complete, stand-alone data acquisition and analysis system can be created by combining the P511 High Performance AC Amplifier with the P122 AC/DC Preamplifier and the PolyVIEW16 Data Acquisition and Analysis Software Package. The P122 is designed to take up less than 2 inches of rack space, allowing a complete, powerful data acquisition system to be configured in a minimum of space.

The CP122 is enclosed in a rugged all-metal chassis that is easy to stack vertically or horizontally. Optional rackmount hardware allows two units to be mounted side-by-side in a standard 19" rack while using only 3.5" of vertical space.

The P122 and CP122 amplifiers must be used with a Grass medical-grade regulated power supply. The power supplies provide highly regulated ▒12 VDC. All models are CSA/UL listed for medical device safety.

SPECIFICATIONS
Amplification
Amplification   50 minimum to 100,000 maximum
Amplification Settings   6-position step switch.
Settings of 2,000, 5,000, 10,000, 20,000, 50,000 and 100,000
Vernier Control   Ratio of 40 to 1
Input Selections
DC   For DC bioelectric potentials from electrodes and for interfacing transducers
AC   For AC coupling of bioelectric potentials from electrodes and AC coupling transducers. Time Constants of 0.01, 0.1, 1 and 10 seconds, switch selectable
Input Impedance   1 Mohm, differential
Balance Voltage   ▒200 mV DC, ▒5% accuracy
Coarse Control   3-position toggle switch: x0.1, x1.0, x20
Fine Control   10-turn potentiometer provides 0.1, 1.0 and 20 mV/turn
Stability
Drift   Less than 1 ÁV/hr after thermal stabilization
With Grass FT03
Force Transducer
  5 mg/hr (typical)
Filters
High
(cutoff frequencies, -6 dB)
  3000, 1000, 300, 100, 30, 10, 3, 1, 0.3, 0.1 Hz
Line Filter   Notch-type filter (50/60 Hz), switch selectable
Time Constants   0.01, 0.1, 1 and 10 seconds, switch selectable. Corresponding to frequencies of 10, 1, 0.1 and 0.01 Hz
Output
Output Connector   BNC, front and rear panels
Load Tolerance   5 kohms or greater
Maximum Output   ▒5.0 volts
Display   3-digit LED, minimum resolution: ▒10 mV
Set Output   Pushbutton allows output to be adjusted to zero
Noise   10 ÁV peak to peak, referred to input (DC to 3 kHz)
CMR (Common
Mode Rejection)
  20,000:1 (86 dB) at 100 Hz
Physical Size
CP122 Bench-top   8.625" W x 3.5" H x 8.75" D
(21.9 cm x 8.9 cm x 22.2 cm)
Weight   2 lbs. (0.91 kg)
To Rackmount   Order kit CPRK1 for a single amplifier, or CPRK2 for mounting two amplifiers side by side
P122 Rackmount   19" W x 1.75" H x 8" D
(48.3 cm x 4.45 cm x 20.3 cm)
Weight   3.125 lbs. (1.44 kg)
Regulatory
    ETL listed to UL2601.1 and CSA 22.2 #601.1
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Model CP122 bench-top style

FEATURES & BENEFITS

• Amplification from 50 to 100,000 for processing of a wide range of bioelectric signals
• AC and DC Input extends versatility by providing excitation for transducers and, with convenient switching to AC, supports EEG, EMG, ECG and other signals
• ▒ 200 mV Balance Voltage simplifies transducer balancing and provides precise measurements of offset potentials
• 10 Low Pass filter positions from 0.1 Hz to 3000 Hz plus line filter tailors the bandwidth to the signal and optimize the A/D process
• LED output display shows instantaneous data values and simplifies setup and calibration
• Very low drift; less than 1microvolt/hour minimizes time-consuming rebalancing procedures

ORDERING INFORMATION
Model P122   AC/DC strain gage preamplifier, 19" rackmount cabinet, includes manual (power supply required)
Model CP122   AC/DC strain gage preamplifier, bench-top cabinet, includes manual and power supply cable (power supply required)
Model RPS312RM   Medical-grade power supply, 19" rackmount cabinet for use with P122 rackmount model
Model RPS312   Medical-grade power supply, bench-top module for use with CP122 bench-top model
Optional Accessories:
Model F-7IC3/REV1   3-lead input cable, 16-foot length (4.8 m)
Model SRS   Stimulate/Record Switching Unit
Model TAC-7   Transducer cable, 8-foot length (2.4 m) for connection to most Grass transducers
Model CAB-51755   Spare power cable for "daisy-chaining" additional CP122 amplifiers
Model CPRK1   Rackmount conversion kit to mount one CP series amplifiers in 19" rack
Model CPRK2   Rackmount conversion kit to mount two CP series amplifiers side-by-side in 19" rack