Specifications

8
Output sequencing
Each DC power module can be indi-
vidually set to turn on or turn off with a
delay. By adjusting the delay times and
then commanding the Agilent N6705
to turn on, you can set the Agilent
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
Agilent N6705 mainframes. By wiring
the I/O ports on the rear panel of the
mainframes together, a pair of syn-
chronization signals is sent between
mainframes, allowing the output
sequences of each mainframe to be
synchronized.
This capability is also supported to
link Agilent 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 limit-
ing 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 Agilent N6705 provides program-
mable 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 10. 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 confi rm 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 cur-
rent and power per output, identically
rated outputs can be operated directly
in parallel. The maximum rated parallel
operation is 100 A per Agilent 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 connectors. 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 N6705B mainframe provides rear
panel access ports to route these
wires. If you have an N6705A main-
frame, 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 Agilent N6705 DC power
analyzer offers 4-wire sensing capabil-
ity, 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 volt-
age measurement accuracy.
To use 4-wire sensing in addition
to your power leads, you must con-
nect 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.