Connector; Gpib Logic Levels - Keysight N7744A User Manual

1
Getting Started

Connector

C A U T I O N
C A U T I O N

GPIB Logic Levels

28
The following figure shows the connector and pin assignments.
Connector Part Number: 1251-0293
Figure 14 GPIB Connector
Keysight Technologies products delivered now are equipped with connectors
having ISO metric-threaded lock screws and stud mounts (ISO M3.5×0.6) that are
black in color. Earlier connectors may have lock screws and stud mounts with
English-threaded lock screws and stud mounts (6-32 UNC) that have a shiny
nickel finish.
It is recommended that you do not stack more than three connectors, one on top of
the other.
Hand-tighten the connector lock screws. Do not use a screwdriver.
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
Keysight N774x Series