Model 140

USED but in good condition.  WORKING!

Just the item as pictured, no documentation, no cables, no software

TYPE: Dual slope integration with automatic zero and automatic polarity control

DIFFERENTIAL INPUT RANGE:  +4.75 to -5 volts

RESOLUTION: 0.25 millivolts

LINEARITY:  0.005% of full scale

ACCURACY:  0.025% of full scale at normal operating temperatures

REPRODUCIBILITY:  +/-1 count typical

INPUT IMPEDANCE:  1000 megohms typical

CONVERSION TIME:  134 milliseconds

ANALOG INPUTS:  4 fully differential channels protected up to 200 volts

DIGITAL INPUT:  single-bit, contact closure or 5-volt logic compatible

DIGITAL OUTPUTS:  4 latched optically isolated lines protected to 200 volts

The Lawson Labs Model 140 Analog Interface card enables an IBM PC computer to translate continuously variable analog voltages into their digital equivalents of ones and zeros. It also provides a means for the computer to turn external equipment on and off. These functions are the basics of monitoring and control systems. Both the analog inputs and the digital outputs are protected against overvoltages.   The Model 140 uses only four memory locations out of the 32 designated for a "prototype card." These four addresses can be changed by altering the switch settings on the Analog Interface.  This arrangement minimizes the chance that there will be a conflict between the Model 140 and any other peripheral card.

There are four optically isolated output lines on the Analog Interface card. These are intended primarily for expanding the number of input channels using an external multiplexer. Any channel can be expanded to 16 channels with an external multiplexer. The optically isolated control lines prevent ground loops from being formed. Configurations of up to 64 analog inputs are possible with four Model 17 Multiplexers. The outputs can also be used for digital control. Think of each one as a contact closure to guard.

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