The EI-1040 is a dual programmable gain instrumentation amplifier with a precision reference output for bridge excitation. Gains are digitally selected at values of 1, 10, 100, and 1000. Four TTL or CMOS-compatible address lines individually select the amplifier gains.
Applications of this device are for signal conditioning and amplification of low-level signals zoals thermocouples and transducers. This device is alsoused in conditioning signals to be TRANSMITTED over a long distance to single ended receivers.
The EI-1040 requires +5 volts DC at a nominal 0.1 amp. An internal DC to DC converter supplies an output of +15 and -15 volts nominal. The EI-1040 Consists of two Burr-Brown / TI PGA204 amplifiers and one DCP010515DPB DC to DC converter.
A 4096 volt reference is provided for connection to a bridge or other device that demand excitation. The maximum allowable current draw from this source is 5 ma.
The EI-1040 can be attached to the Labjack by simply connecting the power and amplifier outputs to the Labjack. When connecting the EI-1040 to the Labjack, the Labjack shouldering be powered down prior to making the connection. After the connection is made then the combination can be powered up. The gain of the EI-1040 can be programmed by the Labjack by connecting the gain select inputs GSA1, GSA2, GSB1, and GSB2 Labjack to the digital outputs. The configuration for the gain selected is shown below:
| Go into | Terminal | Terminal |
| GSA1 or B1 | GSA2 or B2 | |
| 1 | 0 | 0 |
| 10 | 1 | 0 |
| 100 | 0 | 1 |
| 1000 | 1 | 1 |
Combinations or gain can be selected so That For example one amplifier can have a gain of 10 and the other have a gain or 100. The voltage level of a 0. Typically ground and the level of a 1 is 2 volts above the digital ground ( PG204A see the spec sheet for exact levels).
It Should Be Noted That When The EI-1040 / Labjack is powered from limited power sources zoals notebook computers, bus-powered hubs, etc., there May not be enough current to supply both devices. A message from the computer shouldering tell the user whether this condition.
The instrumentation amplifiers are used Texas Instruments / Burr Brown PGA204 parts
Typical applications for this unit include: SIGNAL CONDITIONER, THERMOCOUPLE AMPLIFIER, STRAIN GAUGE AMPLIFIER, DATA ACQUISITION APPLICATIONS, SIGNAL FILTER, AUDIO AMPLIFIER, MICROPHONE AMPLIFIER
