Specifications

6
The Agilent 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 measure-
ments 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 spec-
ify a sample period, which is the
period of time during which these
continuous readings will be accu-
mulated. 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 mea-
surements 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
simultaneous 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
4 gigabytes, 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 6. In Data Logger View, you can log
data on multiple traces. Here, the current
fl owing out of output 1 and output 2 are
captured over 30 seconds.
Figure 7. 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 selected
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
S
tandard
s
ample V + I
(@ 50 kHz)
Continuous
s
ample 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.