Hardware Design Specification
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A Hardware Design Specification defines the physical parts  of the system including:

Operator Interface devices

The controllers

The Input and Output cards,  including

Digital Inputs

Digital Outputs

Analogue Inputs

Analogue Outputs

Pulse Counters

For each instrument or group of instruments the following elements should be considered:

Accuracy

Isolation

Range of current and voltage

Type and numbers of interface cards

Timing



The HDS shall describe the operating environment for the hardware. The following topics

should be considered:

Temperature

Humidity

External Interference

Physical security

Radio-frequency, electro-magnetic and UV-interference

Note that the hardware is not strongly linked with the software development