Remote Operations Using the IEEE 488 Interface
Syntax Diagrams of Major 8508A Functions
4
Input
The following commands are used to select an input; or combined usage of the two inputs to
calculate the Ratio, Difference and Deviation measurement modes. The selections are mutually
exclusive.
INPUT FRONT
REAR
DIV_REAR
SUB_REAR
DEV TN
OFF
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Input and Ratio Configurations
FRONT
This selects the front terminals.
REAR
This selects the rear terminals. NOTE – the DCI/ACI signals that can be applied to the
rear terminals are restricted to 2A max. and scan operations for these function are not
available. Also 4 wire sense for voltage is not available.
OFF
This isolates all the terminals and deselects the scanning measurements.
DIV_REAR
This selects the measurement at the front terminals followed by a measurement at the rear
terminals and computes the ratio of the signals (Front / Rear).
SUB_REAR
This selects the measurement at the front terminals followed by a measurement at the rear
terminals and computes the difference of the signals (Front - Rear).
DEVTN
This selects the measurement at the front terminals followed by a measurement at the rear
terminals and computes the deviation of the signals (Front – Rear / Rear).
Power On and Reset Conditions
FRONT
Exit from a Scanning Mode
Achieved by selecting one of the two inputs or OFF.
Guard
Selection of guarding for all functions.
GUARD INT
EXT
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Remote Guard
4-21
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