Datasheet

The Keysight N6705 DC power analyzer
can also function as a data logger. Using
the measurement capability built into
each DC power module, the N6705
can continuously log data to the large
color display and to a file. Data can be
simultaneously logged on all four DC
outputs. The accuracy of the voltage and
current measurements depends on the
type of module that is installed (basic,
high-performance, precision, and SMU).
As illustrated in the table below, there are
two modes of operation:
– In standard mode, measurements are
spaced by the sample period, which is
programmable from
75 milliseconds to 60 seconds. For
each DC output, voltage measure-
ments, current measurements, or
both can be logged. Each reading
is an integrated voltage or current
measurement. Standard mode data
logging is available on all DC power
module types.
– In continuous sampling mode, the
built-in digitizer of the DC power
module runs continuously at 50,000
readings per second. You can specify
a sample period, which is the period
of time during which these continuous
readings will be accumulated. For
each sample period, one average
reading (and optionally, a minimum
and maximum value) is saved. In this
mode, the digitizer runs continuously as
the readings are averaged and stored;
therefore, the digitizer is always making
measurements and no data is missed.
The sample period is programmable
from 20 microseconds to 60 seconds. In
this mode, the N6760 and N6780 SMU
series of power modules offer simul-
taneous logging of output voltage and
output current. For all other module
types, you can log either voltage or
current when in continuous sampling
mode.
Data Logger View
The maximum data log file size is ~2 giga-
bytes, which is approximately one billion
readings. The data file can be stored on
the N6705’s internal non-volatile RAM or
saved externally on a USB memory device.
Figure 5. In Data Logger View, you can log
data on multiple traces. Here, the current
flowing out of output 1 and output 2 are
captured over 30 seconds.
Figure 6. To set up the data logger, use
a menu screen to select the operating
parameters. Setup screens like this are
used throughout the DC power analyzer.
Standard data logging Continuous data logging
Sample interval
range
75 milliseconds to
60 seconds
20* microseconds to 60 seconds
* Add 20 µs for each additional parameter (Voltage,
Current, Min, or Max)
Sample rate: 50 kHz 200 kHz for N6780 SMU
50 kHz for all others
Data logging mode
used by N6705
Automatically se-
lected when any N6730,
N6740, N6750, or
N6770 are set to
sample BOTH voltage
and current.
Automatically selected when any N6730, N6740,
N6750 or N6770 is set to measure either voltage
or current. Note that N6760 and N6780 SMU
modules can be set to sample BOTH.
Sample interval n Sample interval n+1
wait wait
Standard
sample V +
I
(@ 50 kHz)
Continuous
sample V or
I
(@ 50 kHz)
Averaged
voltage for
5.12 ms
Averaged
current for
5.12 ms
Averaged
voltage for
5.12 ms
Averaged
current for
5.12 ms
Averaged voltage OR current
for entire sample interval
Averaged voltage OR current
for entire sample interval
The data logger display can be saved
as a GIF file for use in reports. The
logged data can be saved for viewing
at a later time. Logged data can also
be exported to a CSV file that can be
read by most common data analysis
software packages.
7 | Keysight | N6700 Modular Power System Family - Data Sheet