External Data Logging
Data Logging Functions
Select the Measurement Function and Range
Specify the Integration Period
Select the Elog Trigger Source
Initiate and Trigger the Elog
Periodically Retrieve the Data
Terminate the Elog
Data Logging Functions
The external Data Logger function is not available if Option 055 has been ordered.
In addition to the built-in data logger, the power analyzer has an external data logger (Elog) function
that lets you log voltage and current measurements from all four outputs directly to an internal FIFO
(first-in, first-out) buffer. Note that this buffer is only large enough to hold about 20 seconds of
accumulated measurements. The following table lists the major differences between the built-in and
external data loggers
The following table details the various data logging functions.
Function Built-in Data Logger External Data Logger
Data viewing Optimized for viewing the measurements on the power
analyzer’s display.
No front panel view or front panel control.
Data Storage Stores the measurements to an internal file. Can be left
unattended for an extended time and results can be
viewed afterward.
Buffers measurements for about 20 seconds and
requires that the computer periodically reads meas-
urements to prevent the power analyzer’s buffer from
overflowing. The computer needs to provide the data stor-
age function.
Measurement
Resources
Allocates all the measurement resources of ALL out-
puts, even if data logging is only enabled on some of
the outputs.
Runs independently on each output. Some outputs can
be running an external data log, while the remaining out-
puts can be used in front panel control or used for other
SCPI functions.
Interleaved Mode Interleaved mode allows the data logger to log both
voltageand current on power modules that have only
one measurement converter.
Interleaved mode is not available. If a power module has
only onemeasurement converter, then either voltage or
current can be logged, but not both.
Logging Rate Can log data at up to 20.48 microseconds for one para-
meter.
Can log data at up to 102.4 microseconds for one para-
meter with data format = real.
Programming the external data logger consists of:
Keysight N6705C Operating and Service Guide 161
4 Using the Measurement Functions
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