Keithley DAS-1800HR Analog Input (A/D)

DAS-1800HR Analog Input block (not recommended)


Simulink® Real-Time™ Library of Drivers No Longer Recommended for Use

Scaling Input to Output

Hardware Input

Block Output Data Type





Block Parameters

Channel vector

If you select 16 channels (Input coupling parameter set to Single-ended channels or Single-ended common mode) enter numbers between 1 and 16 to select the number of individual channels used. If you select eight channels (Input coupling parameter set to Differential) enter numbers between 1 and 8 to select the A/D channels used. This driver allows the selection of individual A/D channels in arbitrary order. The number of elements defines the number of A/D channels used.

For example, to use the first, second and fifth channels, enter


Number the channels beginning with 1 even if this board manufacturer starts numbering the channels with 0.

Gain vector (1,2,4,8)

Enter 1, 2, 4, or 8 for each of the channels in the channel vector to choose the gain code of that channel. The gain vector must be the same length as the channel vector. This driver allows the gain of each channel to be different.

Notice that by increasing the gain code the voltage range is decreased. The gain divides the input voltage range.

For example, if the first channel has a gain code of 1 (10 volt range) and the second and fifth channels have a gain code of 2 (5 volt range), enter

Range vector

From the list, choose either Bipolar or Unipolar.

The range setting defines if the board is working in bipolar or unipolar input mode. This setting is the same for all of the selected channels.

The following table is a list of the ranges for this driver given the gain entered and the range chosen.


Bipolar Range (V)

Unipolar Range (V)


-10 to +10

0 to 10


-5 to + 5

0 to +5


-2.5 to 2.5

0 to 2.5


-1.25 to +1.25

0 to 1.25

Input coupling

From the list, select one from the following list of input modes:

  • Differential (8 channels)

  • Single-ended (16 channels)

  • Single-ended common mode (16 channels)

This choice must correspond to the MUX-switch setting on the board.

Common-mode is similar to single-ended mode but the negative wire of the source to be measured is connected to input AI-SENSE instead of LLGND.

Sample time

Enter the base sample time or a multiple of the base sample time (-1 means sample time is inherited).

Base address

Enter the base address of the board. This entry must correspond to the DIP switch setting on the board. For example, if the DIP switch setting is 300 (hexadecimal), enter 0x300.

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