Datasheet

Output sequencing
Each DC power module can be individually
set to turn on or turn off with a delay. By
adjusting the delay times and then com-
manding the Keysight N6705 to turn on,
you can set the Keysight N6705 modules
to sequence on in a particular order. The
same sequencing capability is available to
shut down the modules in particular order.
Delay times can be set from no delay to
one thousand seconds of delay in one-
millisecond increments.
For applications that require more than four
DC power modules to be sequenced, this
output sequencing can be extended across
multiple Keysight N6705 mainframes. By
wiring the I/O ports on the rear panel of the
mainframes together, a pair of synchroniza-
tion signals is sent between mainframes,
allowing the output sequences of each
mainframe to be synchronized.
This capability is also supported to link
Keysight N6705 output sequences with
outputs installed in N6700B, N6701A
and N6702A Low-Profile Modular Power
System mainframes. It is not supported on
the discontinued N6700A mainframe.
Programmable voltage slew
For some applications, like inrush limiting
or powering rate-sensitive devices, it is
necessary to slow down and control the
speed of the DC output to maintain a
specific voltage slew rate. The Keysight
N6705 provides programmable voltage
slew rate, so that you can easily control the
speed at which the output slews from one
voltage to another. You can set the speed
of a voltage change anywhere from its
maximum up/down programming speed to
its slowest change of up to 10 seconds.
Additional Features
Figure 9. The Output On/Off Delays screen
allows you to enter the delay times for each
output. A graphical representation of the
settings is shown
to visually confirm your choices.
Series and parallel operation
To increase available voltage and power
per output, identically rated outputs can be
operated directly in series. The maximum
series operation is 240 V. To increase the
available current and power per output,
identically rated outputs can be operated
directly in parallel. The maximum rated
parallel operation is 100 A per Keysight
N6705.
Convenient front panel
connections
The N6705 uses 3-way binding posts on
the front panel for connection to the DUT.
The binding posts accept standard banana
plugs, bare wire, and spade-lug connec-
tors. The binding posts are rated for 20 A
per post. To avoid setup and connection
errors, the binding posts are color-coded
to the control keys and the display. For
modules with outputs rated at greater than
20 A, such as the N6753A, high current
wires must be brought out through the
N6705’s rear panel.
The N6705C mainframe provides rear
panel access ports to route these wires.
If you have an N6705A mainframe, order
N6705U-057 to replace your rear panel.
4-wire sensing for improved
measurement accuracy
To improve the voltage measurement
accuracy and regulation of the DC
outputs, the Keysight N6705 DC power
analyzer offers 4-wire sensing capability,
also called remote sensing, on each of the
four outputs of the DC power analyzer.
4-wire remote sensing is useful when the
DUT draws high current and you want to
account for voltage drop in the power leads
to achieve tight regulation and high voltage
measurement accuracy.
To use 4-wire sensing in addition to your
power leads, you must connect two low
current sensing leads between the DUT
input terminals and 4-wire sense terminal
binding posts located on the front of the
N6705 mainframe. This permits the output
module to monitor and regulate its output
voltage directly at the DUT input terminals
instead of the N6705 front panel output
binding posts. It then automatically adjusts
its output voltage to compensate for
voltage drops across the resistance in the
power leads.
For convenience, switching between
2-wire mode (local sensing) and 4-wire
mode (remote sensing) is done via an
internal relay inside the N6705 DC power
analyzer, eliminating the need for shorting
bars or jumpers commonly found on other
bench power sources.
9 | Keysight | N6700 Modular Power System Family - Data Sheet