340 8163A/B, 8164A/B, 8166A/B User’s Guide
11 Installation and Maintenance
GPIB Logic Levels
The instrument’s GPIB lines use standard TTL logic, as follows:
• True = Low = digital ground or 0 Vdc to 0.4 Vdc
• False = High = open or 2.5 Vdc to 5 Vdc
All GPIB lines have LOW assertion states. High states are held at 3.0 Vdc
by pull-ups within the instrument. When a line functions as an input, it
requires approximately 3.2 mA to pull it low through a closure to digital
ground. When a line functions as an output, it will sink up to 48 mA in the
low state and approximately 0.6 mA in the high state.
The GPIB line screens are not isolated from ground.
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