BNC Connections
The rear panel BNC connectors let you apply trigger signals to the instrument as well as generate
trigger signals from the instrument. This also applies to the Digital Control Port.
Input - allows a positive- or negative-going external signal to trigger the instrument. The positive
pulse must have a minimum pulse width of >6 nanoseconds. The negative pulse must have a minimum
pulse width of >90 nanoseconds. Trigger input signals are used by the Arb, Scope, and Data Logger
functions.
Output - generates a negative-going 10 microsecond pulse when a triggered event has occurred on
the instrument.
Information on configuring external triggers is found under Trigger Commands. The electrical
characteristics are described under Supplemental Characteristics.
Installing a Redundant Ground for 400 Hz Operation
Operation at 400 Hz requires the installation of a redundant ground from the instrument chassis to
earth ground. The redundant ground must be permanently attached to the unit as well as to the earth
ground point.
The following procedure describes how to make the permanent connection at the unit using one of the
two rear panel BNC connectors. The user must ensure the integrity and permanence of the connection
at the earth ground point.
The following customer-supplied hardware is required:
l Ground wire (14/16 AWG)
l Uninsulated ring terminal for attaching wire to unit (Tyco p/n 328976 or equivalent)
l Hardware for attaching wire to earth ground point
The following customer-supplied hardware is required:
l 5/8 inch nut driver
Step 1. Use the nut driver and remove the hex nut (1) from only one of the BNC connectors. Do not
remove the lock washer located behind the hex nut.
Step 2. Crimp the ring terminal (2) onto the end of the ground wire
2 Installation
68 Keysight N6705C Operating and Service Guide
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